Diagram sections — 29 (123 total)
AIR CONDITIONING ANTI-LOCK BRAKES ANTI-THEFT BODY CONTROL MODULES COMPUTER DATA LINES CRUISE CONTROL DEFOGGERS ELECTRONIC POWER STEERING ELECTRONIC SUSPENSION ENGINE PERFORMANCE EXTERIOR LIGHTS GROUND DISTRIBUTION HEADLIGHTS HORN INSTRUMENT CLUSTER INTERIOR LIGHTS MEMORY SYSTEMS POWER DISTRIBUTION POWER DOOR LOCKS POWER MIRRORS POWER SEATS POWER WINDOWS RADIO SHIFT INTERLOCK STARTING/CHARGING SUPPLEMENTAL RESTRAINTS TRANSMISSION WARNING SYSTEMS WIPER/WASHER
AIR CONDITIONING Automatic A/C Wiring Diagram (1 of 2) for Chevrolet Silverado 2003 3500 List of elements for Automatic A/C Wiring Diagram (1 of 2) for Chevrolet Silverado 2003 3500: 85 (diesel) (gasoline) 5v ref A/c comp cl rly ctrl A/c comp fuse 10a A/c compressor clutch A/c compressor clutch relay A/c low pressure switch (right side of accumulator) A/c on A/c recirc A/c ref pre sens sig A/c refrigerant pressure sensor (in a/c muffler hose assembly) A10 A11 A12 A5 c1 Amb air temp sig Ambient air temperature sensor (in right front bumper filler assembly Auto B c5 B(+) B10 B11 B12 Blower fuse 40a Blower motor Blower motor control processor (behind right side of dash) Blower speed ctrl C4 e C5 c1 Class 2 ser data Class 2 serial data Fan dn Fan up Frt def G104 (on left rear of engine block) G200 (behind right side of dash, near right "a" pillar) G203 (behind left side of dash, near left "a" pillar) Ground Hot at all times Hot in run Hot in run or start Hvac 1 fuse 10a Hvac control module (behind center of dash) Hvac/ ecas fuse 10a I/p relay block (left side of dash) Ign 3 Ign e fuse 10a Inside air temp sig Inside air temperature sensor assembly (in headliner above driver) Inst lamp dim ctrl Interior lights system Left i/p fuse block (lower left side of dash) Left temp control Lo lt air temp sig Lo press sens sig Lo rt air temp sig Logic Low ref Lower left air temperature sensor (in lower left floor duct assembly) Lower right air temperature sensor (bottom center of hvac box, in floor duct) Lt temp door ctrl Mode Mode door ctrl Off Powertrain control module or engine control module (left front of engine compt) Recir Recir door ctrl Recirc door po sig Red Right i/p fuse block (lower right side of dash) Right temp control Rt temp door ctrl S102 (in engine harness) S207 (in headliner harness) S218 (in i/p harn) Sp205 (in i/p harn) Speed ctrl Tan Temp sen ass ctrl Underhood fuse block (left side of engine compt, near battery) Up lt air temp sig Up rt air temp sig Upper left air temperature sensor (below dash trim panel, in upper duct) Upper right air temperature sensor (below dash trim panel, in upper duct) Automatic A/C Wiring Diagram (2 of 2) for Chevrolet Silverado 2003 3500 List of elements for Automatic A/C Wiring Diagram (2 of 2) for Chevrolet Silverado 2003 3500: 18 Ambient light sens lo ref Ambient light sens sig Ambient light sensor B12 Body control module (lower left side of dash, below steering column) Class 2 serial data Lefft sunload sensor sig Left air temperature actuator (top center of hvac control assembly) Left solar sensor Logic Mode actuator (left side of hvac module) Recirculation actuator (top center of hvac module) Right air temperature actuator (top center of hvac control assembly) Right i/p fuse block (lower right side of dash) Right solar sensor Right sunload sensor sig Sunload sensor (top center of dash) Tan Compressor Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for Compressor Wiring Diagram for Chevrolet Silverado 2003 3500: 26 (diesel) (gasoline) 5v ref A/c comp cl rly ctrl A/c comp fuse 10a A/c compressor clutch A/c compressor clutch relay A/c low pressure switch (right side of accumulator) A/c on switch A/c ref pre sens sig A/c refrigerant pressure sensor (in a/c muffler hose assembly) A12 B11 Class 2 ser data Class 2 serial data G104 (on left rear of engine compt) Hot at all times Hot in run or start Hvac control module (behind center of dash) Ign e fuse 10a Lo press sens sig Logic Low ref Powertrain control module or engine control module (left front of engine compt) Sp205 (in i/p harn) Underhood fuse block (left side of engine compt, near battery) Manual A/C Wiring Diagram (1 of 2) for Chevrolet Silverado 2003 3500 List of elements for Manual A/C Wiring Diagram (1 of 2) for Chevrolet Silverado 2003 3500: 67 (diesel) (gasoline) 5v ref 87a A/c comp cl rly ctrl A/c comp fuse 10a A/c compressor clutch A/c compressor clutch relay A/c low pressure switch (right side of accumulator) A/c on switch A/c recirc A/c ref pre sens sig A/c refrigerant pressure sensor (in a/c muffler hose assembly) A10 A11 A12 A5 c1 B c5 B(+) B10 B11 B12 Blower fuse 40a Blower motor (under right side of dash) Blower motor control switch Blower motor relay Blower motor resistor assembly (on hvac module, near blower motor) Class 2 ser data Class 2 serial data Frt def G104 (on left rear of engine block) G200 (behind right side of dash, near right "a" pillar) G203 (behind left side of dash, near left "a" pillar) Ground Hot at all times Hot in run Hot in run or start Htr a/c fuse 30a Hvac 1 fuse 10a Hvac control module (behind center of dash) Hvac/ ecas fuse 10a I/p relay block (left side of dash) Ign 3 Ign e fuse 10a Inst lamp dim ctrl Interior lights system Left i/p fuse block (lower left side of dash) Left temp control Lo press sens sig Logic Low ref Lt temp door ctrl Mode control Mode door ctrl Off Off blow mt ctrl Powertrain control module or engine control module (left front of engine compt) Recir door ctrl Recirc switch Red Right i/p fuse block (lower right side of dash) Right temp control Rt temp door ctrl S102 (in engine harness) Sp205 (in i/p harn) Tan Underhood fuse block (left side of engine compt, near battery) Manual A/C Wiring Diagram (2 of 2) for Chevrolet Silverado 2003 3500 List of elements for Manual A/C Wiring Diagram (2 of 2) for Chevrolet Silverado 2003 3500: 15 (not used) Ambient light sens lo ref Ambient light sens sig Ambient light sensor (top center of dash) B12 Body control module (lower left side of dash, below steering column) Class 2 serial data G200 (behind right side of dash, near "a" pillar) Left air temperature actuator (top center of hvac control assembly) Logic Mode actuator (left side of hvac module) Recirculation actuator (top center of hvac module) Right air temperature actuator (top center of hvac control assembly) Right i/p fuse block (lower right side of dash) Tan
ANTI-LOCK BRAKES Anti-lock Brakes Wiring Diagram, with Traction Control for Chevrolet Silverado 2003 3500 List of elements for Anti-lock Brakes Wiring Diagram, with Traction Control for Chevrolet Silverado 2003 3500: 67 (diesel) (gas) Abs fuse 60a Anti-lock ind Brake fluid level sw in Brake fluid level switch (on left side of brake fluid reservoir) Brake fuse 10a Brake in Brake ind Brake input C12 C2 b7 C5 c1 C8 a Clutch start switch (top of clutch clutch assy) Data link connector (dlc) (below steering column) Del torque Delivered torque Electronic brake control module (ebcm) (on left side of inner frame) Except seo G104 (left rear of engine block) G110 (left front body mount) G203 (near left "a" pillar) Hot at all times Hot in run Hot in run or start Ign e fuse 10a Ignition Illum lamp Instrument cluster Interior lights system Left front sensor (+) Left front sensor (-) Left front wheel speed sensor Left i/p fuse block (on lower left side of dash) Logic M/t only Nca Pnk Powertrain or engine control module (pcm or ecm) (on left front of eng compt or on left side of inner frame) Red Req torque Requested torque Right front sensor (+) Right front sensor (-) Right front wheel speed sensor S102 S213 Seo Seo ign fuse 10a Serial data Splice pack sp205 (left i/p, under knee bolster trim panel) Stoplamp switch (on top of brake pedal bracket) Tan Tcc brake sw Trac sw input Traction control switch Transfer case shift control module Transmissions system Transmissions system (trasfer case circuit) Underhood fuse block (at left side of eng compt, near battery) Underhood fuse block (at left side of engine compt, near battery) Vehicle speed sensor (vss) (4wd: on left side of transfer case, 2wd: left rear side of transmission) Vss high Vss input Vss low Vss out Anti-lock Brakes Wiring Diagram, without Traction Control for Chevrolet Silverado 2003 3500 List of elements for Anti-lock Brakes Wiring Diagram, without Traction Control for Chevrolet Silverado 2003 3500: 62 (diesel) (gas) (not used) A10 Abs fuse 60a Anti-lock ind B1 c9 B10 Brake fluid level sw in Brake fluid level switch (on left side of brake fluid reservoir) Brake fuse 10a Brake ind Brake input C12 C2 b7 C9 a Clutch start switch (top of clutch clutch assy) Cpp sw sig Data link connector (dlc) (below steering column) E6 c1 Electronic brake control module (ebcm) (on left side of inner frame) Except seo Front axle act/sw input G104 (left rear of engine block) G110 (left front body mount) Hot at all times Hot in run Hot in run or start Ign e fuse 10a Ignition Instrument cluster Left front sensor (+) Left front sensor (-) Left front wheel speed sensor Left i/p fuse block (on lower left side of dash) Logic M/t only Nca Pnk Powertrain or engine control module (pcm or ecm) (on left front of eng compt or on left side of inner frame) Red Right front sensor (+) Right front sensor (-) Right front wheel speed sensor S102 Seo Seo ign fuse 10a Serial data Splice pack sp205 (left side of dash) Stop lamp switch (on top of brake pedal bracket) Tan Tcc brake sw Transfer case shift control module Transmissions system Transmissions system (trasfer case circuit) Underhood fuse block (at left side of eng compt, near battery) Underhood fuse block (at left side of engine compt, near battery) Vehicle speed sensor (vss) (4wd: on left side of transfer case, 2wd: left rear side of transmission) Vss high Vss input Vss low Vss output
ANTI-THEFT Forced Entry Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for Forced Entry Wiring Diagram for Chevrolet Silverado 2003 3500: 48 (inside driver door) (inside front passenger door) (left side of dash, near steering column) A12 Ajar sw All times B12 Base Battery Body control module D12 Door ajar sw sig Door sw lo ref Driver door module Driver mini-wedge door jamb switch Ex lights ctrl Exterior lights system Front passenger door module Front passenger mini-wedge door jamb switch G200 (behind right side of dash) G203 (upper right kick panel) G305 (bottom of left "b" pillar) G306 (bottom of right "b" pillar) Ground Headlights ctrl Headlights system Horn rly ctrl Horns system Hot at I/p fuse block & i/p relay block) I/p relay block Key sw Key sw lo ref Key sw sig Left i/p fuse block (lower left side of dash) Left rear mini-wedge door jamb switch (crew cab) Lf door ajar sw Lr door ajar sw Rf door ajar sw Right i/p fuse block (lower right side of dash) Right rear mini-wedge door jamb switch (crew cab) Rr door ajar sw Serial data Splice pack sp205 (left kick panel) Tan Tbc batt fuse 10a Underhood fuse block Uplevel Passlock Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for Passlock Wiring Diagram for Chevrolet Silverado 2003 3500: 37 12v reference A11 A12 B12 Battery Body control module (lower left side of dash, near steering column) Class 2 serial data D12 Data Data link connector (lower left side of dash) G203 (behind left side of dash) Ground Hot at all times Hot in run & start I/p relay block (under left side of dash) Ign Ign 1 voltage Ign sw sig Ignition key alarm switch (on ignition key cylinder) Instrument panel cluster Key Lock cylinder Low reference Magnet Passlock sensor (internal to steering column) Pnk Powertrain control module (on left front of engine compt) S217 (in steering column harness) Sec sens sig Security indicator Security sensor Serial data Splice pack sp205 (upper left kick panel) Tamper sensor Tbc batt fuse 10a Tbc ign 1 fuse 10a Underhood fuse block
BODY CONTROL MODULES Body Control Modules Wiring Diagram (1 of 2) for Chevrolet Silverado 2003 3500 List of elements for Body Control Modules Wiring Diagram (1 of 2) for Chevrolet Silverado 2003 3500: 75 (base) (upper level) (bsae) (upper level) 12 volt ref A10 A11 A12 Ambiennt light sens sig Ambient light sensor (top center of dash) Anbient light sensor Anti-lock brakes system Anti-theft system B10 B11 B12 Battery + Body control module (on lower left side of dash, below steering column) Body relay block Class 2 serial data Computer data lines system D12 Defogger system Dimming input/courtesy lmp pwm Dimming potentiometer 5volt ref Door locks system Driver door unlock rly ctrl Driver sunload sens sig Drl off ind Drl relay ctrl Drl sw sig E11 E12 Exterior lights system Fog light relay ctrl Front fog lamp sw sig G203 (behind left side of dash, near "a" pillar) Ground Ground distribution system Headlamp high beam relay ctrl Headlamp low beam relay ctrl Headlights system Horn rly ctrl Horns system Hot at all times I/p lamp dinning ctrl Interior lamp defeat sw sig Interior lights system L solar sensor Led dimming sig Left i/p fuse block Low ref Park lamp relay ctrl Park lamp sw on sig Pass door lock sw lock ctrl Pass door lock sw unlock ctrl Passenger sunload sens sig Pnk Power distribution system Power tops system R solar sensor Rear defog rly ctrl Red Remote radio ctrl sig Securityn system sens sig Sound system Steering wheel position sen sig Sunload sensor Tbc 2a fuse 15a Tbc 2c fuse 15a Tbc batt fuse 10a Tow/haul sw sig Tow/haul switch Underhood fuse block W/ automatic a/c W/ manual a/c Body Control Modules Wiring Diagram (2 of 2) for Chevrolet Silverado 2003 3500 List of elements for Body Control Modules Wiring Diagram (2 of 2) for Chevrolet Silverado 2003 3500: 51 (base) (crew cab) (up level) A10 A11 Accessory volt B11 B12 Backup lamp sig Battery + Body control module (on lower left side of dash, below steering column) Cargo lamp low ctrl Courtesy lamps on sig Door lock ctrl Door locks system Door unlock ctrl Exterior lights system Headlamp sw flash to pass sig Headlamp sw headlamp on sig Headlights system Hot at all times Hot in run & acc Hot in run & start Hot in run, start & acc I/p lamps dimmer sw low ref Ignition 0 volt Ignition 1 volt Interior lights system Key in ignition sw sig Left front door ajar sw sig Left i/p fuse block Left rear door ajar sw sig Low ref Park brake sw sig Park brake switch (part of park brake assembly) Pnk Power window lockout lr sig Power window lockout rr sig Power window sw lr down sig Power window sw lr up sig Power window sw rr down sig Power window sw rr up sig Power windows system Right front door ajar sw sig Right rear door ajar sw sig Tbc 2b fuse 15a Tbc accy fuse 10a Tbc ign 0 fuse 10a Tbc ign 1 fuse 10a Underhood fuse block Warnings system
COMPUTER DATA LINES Computer Data Lines Wiring Diagram, Base & Up-Level for Chevrolet Silverado 2003 3500 List of elements for Computer Data Lines Wiring Diagram, Base & Up-Level for Chevrolet Silverado 2003 3500: 40 (10/20 series) (30 series) (not used) B11 B12 Body control module (on lower left side of dash, below steering column) Cig ltr fuse 15a Data link connector (dlc) (under left side of dash, below steering column) Digital radio receiver (behind center of dash) Driver door module (ddm) (in left front door) Electronic brake control module (ebcm) (on left side of inner frame) Except 6.6l vin 2 6.6l vin 2 Front passenger door module (fpdm) (in right front door) G200 (near right "a" pillar) G203 (near left "a" pillar) Ground distribution system Hot at all times Hvac control module (behind center of dash) I/p relay block (under left side of dash, near kick panel) Inflatable restraint sensing/diagnostic module (under left front seat) Instrument panel cluster (ipc) Left i/p fuse block (under left side of dash) Memory seat module (underside of driver seat) Pnk Power distribution system Powertrain control module (pcm)/engine control module (ecm) (on left front of engine compt) Radio (at center of dash) Rear seat audio (rsa) controller (under rear of center console) Rear seat entertainment (rse) assembly (at center of headliner) Rear wheel steering control module (at left rear of vehicle, near spare tire bracket) Remote playback device-cd player (center of dash, below radio) Right i/p fuse block (under right side of dash) S202 Sp205 (in i/p harness) Sp207 (left side of dash) Tan Transfer case shift control module (behind headlamp switch) Transmission control module (at left front of eng compt) Underhood fuse block (at left side of engine compt, near battery) Vehicle communication interface module (vcim) (behind passenger air bag module) Computer Data Lines Wiring Diagram, Luxury for Chevrolet Silverado 2003 3500 List of elements for Computer Data Lines Wiring Diagram, Luxury for Chevrolet Silverado 2003 3500: 42 (10/20 series) (30 series) (not used) Audio amplifier (under rear of center console) B10 B11 B12 Body control module (on lower left side of dash, below steering column) Cig ltr fuse 15a Data link connector (dlc) (under left side of dash, below steering column) Digital radio receiver (behind center of dash) Driver door module (ddm) (in left front door) Electronic brake control module (ebcm) (on left side of inner frame) Except 6.6l vin 2 6.6l vin 2 Front passenger door module (fpdm) (in right front door) G200 (near right "a" pillar) G203 (near left "a" pillar) Ground distribution system Hot at all times Hvac control module (behind center of dash) I/p relay block (under left side of dash, near kick panel) Inflatable restraint sensing/diagnostic module (under left front seat) Instrument panel cluster (ipc) Left i/p fuse block (under left side of dash) Memory seat module (underside of driver seat) Pnk Power distribution system Powertrain control module (pcm)/engine control module (ecm) (on left front of engine compt) Radio (at center of dash) Rear seat audio (rsa) controller (under rear of center console) Rear seat entertainment (rse) assembly (at center of headliner) Rear wheel steering control module (at left rear of vehicle, near spare tire bracket) Remote playback device-cd player (at center of dash, below radio) Right i/p fuse block (under right side of dash) S202 Sp205 (in i/p harness) Sp207 (left side of dash) Tan Transfer case shift control module (behind headlamp switch) Transmission control module (at left front of eng compt) Underhood fuse block (at left side of engine compt, near battery) Vehicle communication interface module (vcim) (behind passenger air bag module)
CRUISE CONTROL
4.3L VIN X 4.3L VIN X, Cruise Control Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for 4.3L VIN X, Cruise Control Wiring Diagram for Chevrolet Silverado 2003 3500: 49 A/t A10 Anti- lock brakes system Brake fuse 10a Class 2 data Clutch pedal position switch (top of clutch pedal) Clutch sw input Computer data lines system Cruise control module (left rear of engine compt, on firewall) Cruise control on/off switch Cruise engage in Cruise engage out Cruise fuse 10a Cruise ind Cruise on input D11 Exterior lights system F12 G203 (behind left side of dash) Ground Hot at all times Hot in run I/p relay block Ign Ignition Instrument panel cluster Left i/p fuse block (on lower left side of dash) M/t Nca Off Powertrain control module (left front of engine compt) Radio Resume/ accel Resume/accel Resume/accel sig S240 Serial data Set/ coast Set/coast sig Stop lps fuse 20a Stoplamp sw input Turn signal multifunction switch Underhood fuse block (near battery) Veh stop fuse 15a Vehicle speed sensor (vss) (2wd: left side of transmission) (4wd: left side of transfer case) Vss high Vss in Vss low Vss out
4.8L VIN V 4.8L VIN V, Cruise Control Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for 4.8L VIN V, Cruise Control Wiring Diagram for Chevrolet Silverado 2003 3500: 54 (not used) 5v ref A10 Acceleration pedal position sensor (behind accelerator pedal) App sensor 1 sig App sensor 2 sig Class 2 data Computer data lines system Cruise control on/off switch Cruise fuse 10a Cruise ind Cruise on sw sig Etc/ecm fuse 15a Exterior lights system F12 G104 (left rear of engine) Ground Hot at all times Hot in run Hot in run & start Ign Ign volt Instrument panel cluster Left i/p fuse block (on lower left side of dash) Low ref Nca Off Pnk Powertrain control module (left front of engine compt) Resume/ accel Resume/accel Resume/accel sig S102 S162 (w/ pto) (i/p harn) S240 Serial data Set/ coast Set/coast sig Stop lps fuse 20a Stoplamp switch (top of brake pedal) Tac motor cntrl 1 Tac motor cntrl 2 Tan Throttle actuator control module (left rear of engine compt) Throttle body Tp sensor 1 sig Tp sensor 2 sig Turn signal multifunction switch Under- hood fuse block Underhood fuse block (near battery) Veh stop fuse 15a Vehicle speed sensor (vss) (2wd: left side of transmission) (4wd: left side of transfer case) Vss high Vss low
5.3L VIN T 5.3L VIN T, Cruise Control Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for 5.3L VIN T, Cruise Control Wiring Diagram for Chevrolet Silverado 2003 3500: 54 (not used) 5v ref A10 Acceleration pedal position sensor (behind accelerator pedal) App sensor 1 sig App sensor 2 sig Class 2 data Computer data lines system Cruise control on/off switch Cruise fuse 10a Cruise ind Cruise on sw sig Etc/ecm fuse 15a Exterior lights system F12 G104 (left rear of engine) Ground Hot at all times Hot in run Hot in run & start Ign Ign volt Instrument panel cluster Left i/p fuse block (on lower left side of dash) Low ref Nca Off Pnk Powertrain control module (left front of engine compt) Resume/ accel Resume/accel Resume/accel sig S102 S162 (w/ pto) (i/p harn) S240 Serial data Set/ coast Set/coast sig Stop lps fuse 20a Stoplamp switch (top of brake pedal) Tac motor cntrl 1 Tac motor cntrl 2 Tan Throttle actuator control module (left rear of engine compt) Throttle body Tp sensor 1 sig Tp sensor 2 sig Turn signal multifunction switch Under- hood fuse block Underhood fuse block (near battery) Veh stop fuse 15a Vehicle speed sensor (vss) (2wd: left side of transmission) (4wd: left side of transfer case) Vss high Vss low
6.0L VIN U 6.0L VIN U, Cruise Control Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for 6.0L VIN U, Cruise Control Wiring Diagram for Chevrolet Silverado 2003 3500: 54 (not used) 5v ref A10 Acceleration pedal position sensor (behind accelerator pedal) App sensor 1 sig App sensor 2 sig Class 2 data Computer data lines system Cruise control on/off switch Cruise fuse 10a Cruise ind Cruise on sw sig Etc/ecm fuse 15a Exterior lights system F12 G104 (left rear of engine) Ground Hot at all times Hot in run Hot in run & start Ign Ign volt Instrument panel cluster Left i/p fuse block (on lower left side of dash) Low ref Nca Off Pnk Powertrain control module (left front of engine compt) Resume/ accel Resume/accel Resume/accel sig S102 S162 (w/ pto) (i/p harn) S240 Serial data Set/ coast Set/coast sig Stop lps fuse 20a Stoplamp switch (top of brake pedal) Tac motor cntrl 1 Tac motor cntrl 2 Tan Throttle actuator control module (left rear of engine compt) Throttle body Tp sensor 1 sig Tp sensor 2 sig Turn signal multifunction switch Under- hood fuse block Underhood fuse block (near battery) Veh stop fuse 15a Vehicle speed sensor (vss) (2wd: left side of transmission) (4wd: left side of transfer case) Vss high Vss low
DEFOGGERS Heated Mirrors Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for Heated Mirrors Wiring Diagram for Chevrolet Silverado 2003 3500: 24 A7 c1 B11 Battery Computer data lines system Ddm fuse 15a Driver door module (ddm) (below driver door switch panel) Driver outside rearview mirror F c3 Front passenger door module (fpdm) (below front passenger door switch panel) G200 (near right "a" pillar) Ground Ground distribution system Hot at all times Hvac control module Left i/p block fuse block (under left side of dash) Left i/p fuse block (under left side of dash) Low ref Passenger outside rearview mirror Pdm fuse 10a R def Right i/p fuse block (under right side of dash) S202 Serial data Tan Rear Defogger Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for Rear Defogger Wiring Diagram for Chevrolet Silverado 2003 3500: 21 (pickup: right "b" pillar) (crewcab: near left "c" pillar) A c1 A c2 A6 c1 B11 B12 Body control module (below left side of dash) Computer data lines system G306 (pickup) g390 (crewcab) Hot at all times Hot in run & start Htr Hvac control module (behind center of dash) I/p relay block (below left side of dash) Ign L c10 Logic Rear defogger relay Rear window defogger grid Relay cntrl Serial data
ELECTRONIC POWER STEERING Rear Wheel Steering Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for Rear Wheel Steering Wiring Diagram for Chevrolet Silverado 2003 3500: 68 12v ref 2ws ind ctrl 4ws fuse 15a 4ws ind ctrl 5 volt ref 5v ref B+ volt B11 Base Body control module (on lower left side of dash, below steering column) C1 b5 C1 c5 Case gnd Case ground Combination yaw rate sensor/lateral accelerometer sensor (under front passenger seat) Computer data lines system Cruise fuse 10a D12 G101 G203 (near left "a" pillar) Gnd Hall a sig Hall b sig Hall c sig Hot at all times Hot in run I/p relay block (lower left side of dash) Ign 3 fuse 10a Ign 3 volt Instrument cluster system Interior lights system Lat accel sig Left i/p fuse block Low ref Mega fuse 125a Mode ind ctrl Mode sw sig Phase a ctrl Phase b ctrl Phase c ctrl Pnk Pos 1 sig Pos 2 sig Pos a sig Pos b sig Power distribution system Pulse sig Rear wheel position sensor (left rear of vehicle) Rear wheel steering control module (near spare tire bracket) Rear wheel steering mode select switch Red Rly gnd Rly volt S212 (in i/p harness) S240 (in steering pnk column harness) S241 (in steering column harness) Sens gnd Sens ref Sens sig Serial data Steering gear motor assembly (near spare tire bracket) Steering wheel speed/ position sensor (on steering column) Tan Tan c Underhood fuse block Underhood fuse holder Vss Yaw sens sig
ELECTRONIC SUSPENSION Electronic Suspension Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for Electronic Suspension Wiring Diagram for Chevrolet Silverado 2003 3500: 20 (in cahssis harn) s350 Firm Firm indicator G200 (behind right side of dash, near right "a" pillar) G302 (on left rear body mount) G401 (on spare tire hoist bracket) Hot in run or start I/p relay block (below left side of dash, left of steering column) Illum Interior lights system Left front shock absorber solenoid Left rear shock absorber solenoid Off Pnk Right front shock absorber solenoid Right rear shock absorber solenoid Selectable ride switch Seo ign fuse 10a Solid state Underhood fuse block (at left side of eng compt, near battery)
ENGINE PERFORMANCE
4.3L VIN X 4.3L VIN X, Engine Performance Wiring Diagram (1 of 4) for Chevrolet Silverado 2003 3500 List of elements for 4.3L VIN X, Engine Performance Wiring Diagram (1 of 4) for Chevrolet Silverado 2003 3500: 74 (below steering column) data link connector (bottom front of engine) crankshaft position sensor (right rear of engine block) +5v 3-2 ss A/c system A12 Anti-lock brakes system B10 B12 Body control module (below steering column) Brk sw C10 Ckp sig Cls 2 data Clutch sw Cmp Coolant lev D10 E10 E11 Ect sig Engine oil pressure (eop) sensor G103 Gnd Ho2s hi Ho2s lo Hot at all times Hot in accy, run & start Hot in run & start Ign Ign 0 fuse 10a Inj 1 ctrl Inj 2 ctrl Inj 3 ctrl Inj 4 ctrl Inj 5 ctrl Inj 6 ctrl Inj1 fuse 15a Inj2 fuse 15a Injectors Left i/p fuse block Low ref Nca O2a fuse 15a O2b fuse 15a Oil lev Pcm1 fuse 15a Pcmb fuse 20a Pnk Pnk b Pnk d Pnk e Pnk h Pnk j Pnk l Powertrain control module (pcm) (left front of engine compt) Prnd a Prnd b Prnd p Range b Range c Red Ref low Rly ctrl S103 S110 Sens gnd Sensor sig Sp205 (in i/p harness) Starting system Tan Torque sig Underhood junction block 4.3L VIN X, Engine Performance Wiring Diagram (2 of 4) for Chevrolet Silverado 2003 3500 List of elements for 4.3L VIN X, Engine Performance Wiring Diagram (2 of 4) for Chevrolet Silverado 2003 3500: 27 (left rear of engine) g104 (not used) Engine coolant level switch (in coolant reservoir) Engine coolant temperature sensor (rear side of left cylinder head) Engine oil level switch (right side of oil pan) Fuel pump & sender assembly (in fuel tank) Fuel pump relay G103 (right rear of engine) G104 (left rear of engine) G110 (left front body mount) Heated oxygen sensor (bank 1 sensor 1) (left exh pipe, before converter) Heated oxygen sensor (bank 1 sensor 2) (left exh pipe, after converter) Heated oxygen sensor (bank 2 sensor 1) (right exh pipe, before converter) Heated oxygen sensor (bank 2 sensor 2) (right exh pipe, after converter) Hot at all times Knock sensor (rear of engine block) Nca Park/neutral position switch (left side of transmission) Pcm b fuse 20a Pnk Red S102 S103 S312 Tan Throttle position sensor (on throttle body assy) Under- hood fuse block 4.3L VIN X, Engine Performance Wiring Diagram (3 of 4) for Chevrolet Silverado 2003 3500 List of elements for 4.3L VIN X, Engine Performance Wiring Diagram (3 of 4) for Chevrolet Silverado 2003 3500: 49 (in chassis harn) 1-2 sol 2-3 sol 3-2 sol A red A/t fluid pressure manual valve position switch Automatic transaxle Brake fuse 10a C12 Camshaft position sensor (in distributor) Clutch start switch (top of pedal bracket) Cruise control system E11 Evaporative emissions canister purge solenoid (right front side of engine) Evaporative emissions canister vent solenoid (right front side of fuel tank) Fuel tank pressure sensor (in fuel tank) G103 (right rear of engine) Gnd Hot in accy, run & start Hot in run Iat sensor Ign Ign0 fuse 10a Instrument cluster system Intake air temperature (iat)/mass airflow (maf) sensor (in air induction tube) Left i/p fuse block Manifold absolute pressure sensor (top rear of engine) N pnk P red Pc sol valve Pnk Pnk a Pnk d Power distribution system Red Red/ Rev S103 S150 Signal Stop- lamp switch (top of brake pedal bracket) Tan Tan b Tcc pwm sol Tcc sol Tft sensor Under- hood junction block Underhood fuse block Vehicle speed sensor (left rear of transmission) 4.3L VIN X, Engine Performance Wiring Diagram (4 of 4) for Chevrolet Silverado 2003 3500 List of elements for 4.3L VIN X, Engine Performance Wiring Diagram (4 of 4) for Chevrolet Silverado 2003 3500: 80 (lower right front of eng block) 1-2 ss ctrl 2-3 ss ctrl 4wd low 4ws fuse 15a A/c clu A/c system Anti-lock brake system (speed signal) Anti-lock brakes system B11 Coil driver Coil wire Crank fuse 10a Crank voltage Cruise control system a/c system Cruise eng Distributor Evap vent ctrl Fld sig Front axle actuator (right side of center on axle housing) Frt axle sw Fuel lev Fuel sig ctrl G102 G103 (right rear of engine) Gen l Gnd Hot at all times Hot in run & start Hot in start Htr low ctrl Iac coil hi Iac coil lo Iat sig Ic timing ctrl Idle air control valve (on throttle body) Ign Ign feed Ignition coil Ignition control module (right rear of engine) Instrument cluster systems (speed signal) Instrument panel cluster Ipc/dic fuse 10a Logic Low ref Maf sig Malfunction indicator lamp Map sig Mil ctrl Oil press sig Pc sol hi Pc sol lo Pmp rly ctrl Pnk Pnk a Powertrain control module (pcm) (left front of engine compt) Prnd c Red Rpm out S103 Sens gnd Sens sig Sol ctrl Starting/ charging system Starting/charging system Sw sig Tan Tcc pwm Tcc sol ctrl Tft sens sig Timing Torque sig Tp sig Trans rng a Trans- missions system Transfer case shift control module (left front of transaxle case) Under- hood junction block Vss high Vss low Vss out
4.8L VIN V 4.8L VIN V, Engine Performance Wiring Diagram (1 of 5) for Chevrolet Silverado 2003 3500 List of elements for 4.8L VIN V, Engine Performance Wiring Diagram (1 of 5) for Chevrolet Silverado 2003 3500: 67 (below steering column) data link connector (lower right rear of engine) crankshaft position (ckp) sensor +5v 3-2 ss ctrl A/c system Anti-lock brakes sys Body control module (below steering column) Brk sw sig C10 Ckp sig Cls 2 data Cmp sig Cpp sw sig D10 E10 E11 Ect sig Electronic suspension system Fuel comp sig G103 (right rear of engine) Gnd Ho2s hi sig Ho2s lo Hot at all times Hot in accy, run & start Hot in run & start Ign Ign 0 fuse 10a Inj 1 ctrl Inj 2 ctrl Inj 3 ctrl Inj 4 ctrl Inj 5 ctrl Inj 6 ctrl Inj 7 ctrl Inj 8 ctrl Inj1 fuse 15a Inj2 fuse 15a Injectors Ks signal Left i/p fuse block Lev sw sig Lift/dive sig O2a fuse 15a O2b fuse 15a Oil lev sw sig Pcmb fuse 20a Pnk Pnk a Powertrain control module (left front of engine compt) Prnd a sig Prnd b sig Prnd p sig Range b Range c Red Ref low Ref low (a/t) Req torq sig Rly ctrl S103 S110 Serial data Sp205 (in i/p harness) Starting/ charging system Tan Under- hood fuse block 4.8L VIN V, Engine Performance Wiring Diagram (2 of 5) for Chevrolet Silverado 2003 3500 List of elements for 4.8L VIN V, Engine Performance Wiring Diagram (2 of 5) for Chevrolet Silverado 2003 3500: 36 (4l60) (4l80) (dual tanks) (in secondary fuel tank) fuel pump & sender assembly (secondary) (left rear of engine) g104 (not used) (right rear of engine) Coolant level switch (in coolant reservoir) Engine coolant temperature sensor (front of left cylinder head) Engine oil level switch (right side of oil pan) Fuel pump & sender assembly (primary) (in fuel tank) Fuel pump relay Fuel pump relay (secondary) (dual tanks) (on underhood fuse block bracket) G103 G103 (right rear of engine) G104 (left rear of engine) G110 (left front body mount) Heated oxygen sensor (bank 1 sensor 1) (left exh pipe, before converter) Heated oxygen sensor (bank 1 sensor 2) (left exh pipe, after converter) Heated oxygen sensor (bank 2 sensor 1) (right exh pipe, before converter) Heated oxygen sensor (bank 2 sensor 2) (right exh pipe, after converter) Hot at all times Hot in run & start Knock sensor (under intake manifold) Nca Park/neutral position switch (left side of transmission) Pcm b fuse 20a Pcm1 fuse 15a Pnk Red S102 S103 S312 Tan Under- hood fuse block Underhood fuse block 4.8L VIN V, Engine Performance Wiring Diagram (3 of 5) for Chevrolet Silverado 2003 3500 List of elements for 4.8L VIN V, Engine Performance Wiring Diagram (3 of 5) for Chevrolet Silverado 2003 3500: 39 (4l60e) (4l60e) s 1-2 sol 2-3 sol 3-2 sol A red A/t fluid pressure manual valve position switch Automatic transaxle Brake fuse 10a C12 Camshaft position sensor (top center rear of engine) Engine oil pressure (eop) sensor (top rear of engine) Evaporative emissions (evap) canister purge solenoid (behind throttle body) Evaporative emissions canister vent solenoid (right front side of fuel tank) F12 Fuel tank pressure sensor (in fuel tank) Hot at all times Hot in run Instrument cluster system Left i/p fuse block Manifold absolute pressure sensor (top rear of engine) N pnk P red Pc sol valve Pnk Pnk a Red Red/ Rev S150 Stop lps fuse 20a Stop- lamp switch (top of brake pedal bracket) Tan Tcc pwm sol Tcc sol Tft sensor Under- hood fuse block Underhood fuse block Vehicle speed sensor (rear of transmission/ transfer case) 4.8L VIN V, Engine Performance Wiring Diagram (4 of 5) for Chevrolet Silverado 2003 3500 List of elements for 4.8L VIN V, Engine Performance Wiring Diagram (4 of 5) for Chevrolet Silverado 2003 3500: 43 (behind accelerator pedal) accelerator pedal position sensor (in transmission) (4l80e) automatic transmission input shaft speed sensor 4ws fuse 15a A10 Act cntrl App sens 1 App sens 2 Cruise control system Cruise req Data E11 Ect/ecm fuse 15a Fuel composition sensor (flex fuel) G103 (right rear of engine) G104 (left rear of engine) Gnd Ground Hot at all times Hot in run & start Hot in run or start Iat sensor Ign Ign0 fuse 10a Intake air temperature (iat)/ mass airflow (maf) sensor (in air induction tube) Left i/p fuse block Not used Pnk R/a input Red Ref low S/c input S102 S103 Signal Stp lp in Tac ctrl Tan Throttle actuator control module (rear of engine compt) Throttle body Tp sens 1 Tp sens 2 Underhood fuse block Veh stop fuse 15a 4.8L VIN V, Engine Performance Wiring Diagram (5 of 5) for Chevrolet Silverado 2003 3500 List of elements for 4.8L VIN V, Engine Performance Wiring Diagram (5 of 5) for Chevrolet Silverado 2003 3500: 85 (in ignition coil jumper harness) (in injector jumper harness) (left rear of engine) g104 (left side of engine) g102 1-2 ss ctrl 2-3 ss ctrl 4wd low sig A/c system A12 Air conditioning system Anti-lock brakes system At iss high sig At iss low sig Axle sw sig B10 B11 Clu rly ctrl Crank fuse 10a Crank volt Css sig Ctrl Cycle sig Delivered torq Evap canp ctrl Evap vent ctrl Exc seo Fuel lev sens Fuel lev sig Fuel press sig G103 (right rear of engine) Gnd Ho2s htr low Ho2s low ctrl Hot at all times Hot in run & start Hot in start Iat sig Ign Ign ctrl Ign feed Ignition coils Ind ctrl Instrument cluster system Instrument panel cluster Ipc/dic fuse 10a Logic Maf sig Malfunction indicator lamp Map sig Mil ctrl Nca Nca nca Pc sol hi ctrl Pc sol lo ctrl Pcm1 fuse 15a Pmp rly ctrl Pnk Pnk d Powertrain control module (left front of engine compt) Press sens sig Prnd c sig Red Red c Ref lo Ref low Rpm out S103 S151 S152 S153 S154 S157 Seo Seo b1 fuse 15a Spark plug Starting/charging system Tan Tcc pwm ctrl Tcc sol ctrl Tft sens sig Transmissions system Underhood fuse block Vss high sig Vss low sig Vss out
5.3L VIN T 5.3L VIN T, Engine Performance Wiring Diagram (1 of 5) for Chevrolet Silverado 2003 3500 List of elements for 5.3L VIN T, Engine Performance Wiring Diagram (1 of 5) for Chevrolet Silverado 2003 3500: 67 (below steering column) data link connector (lower right rear of engine) crankshaft position (ckp) sensor +5v 3-2 ss ctrl A/c system Anti-lock brakes sys Body control module (below steering column) Brk sw sig C10 Ckp sig Cls 2 data Cmp sig Cpp sw sig D10 E10 E11 Ect sig Electronic suspension system Fuel comp sig G103 (right rear of engine) Gnd Ho2s hi sig Ho2s lo Hot at all times Hot in accy, run & start Hot in run & start Ign Ign 0 fuse 10a Inj 1 ctrl Inj 2 ctrl Inj 3 ctrl Inj 4 ctrl Inj 5 ctrl Inj 6 ctrl Inj 7 ctrl Inj 8 ctrl Inj1 fuse 15a Inj2 fuse 15a Injectors Ks signal Left i/p fuse block Lev sw sig Lift/dive sig O2a fuse 15a O2b fuse 15a Oil lev sw sig Pcmb fuse 20a Pnk Pnk a Powertrain control module (left front of engine compt) Prnd a sig Prnd b sig Prnd p sig Range b Range c Red Ref low Ref low (a/t) Req torq sig Rly ctrl S103 S110 Serial data Sp205 (in i/p harness) Starting/ charging system Tan Under- hood fuse block 5.3L VIN T, Engine Performance Wiring Diagram (2 of 5) for Chevrolet Silverado 2003 3500 List of elements for 5.3L VIN T, Engine Performance Wiring Diagram (2 of 5) for Chevrolet Silverado 2003 3500: 36 (4l60) (4l80) (dual tanks) (in secondary fuel tank) fuel pump & sender assembly (secondary) (left rear of engine) g104 (not used) (right rear of engine) Coolant level switch (in coolant reservoir) Engine coolant temperature sensor (front of left cylinder head) Engine oil level switch (right side of oil pan) Fuel pump & sender assembly (primary) (in fuel tank) Fuel pump relay Fuel pump relay (secondary) (dual tanks) (on underhood fuse block bracket) G103 G103 (right rear of engine) G104 (left rear of engine) G110 (left front body mount) Heated oxygen sensor (bank 1 sensor 1) (left exh pipe, before converter) Heated oxygen sensor (bank 1 sensor 2) (left exh pipe, after converter) Heated oxygen sensor (bank 2 sensor 1) (right exh pipe, before converter) Heated oxygen sensor (bank 2 sensor 2) (right exh pipe, after converter) Hot at all times Hot in run & start Knock sensor (under intake manifold) Nca Park/neutral position switch (left side of transmission) Pcm b fuse 20a Pcm1 fuse 15a Pnk Red S102 S103 S312 Tan Under- hood fuse block Underhood fuse block 5.3L VIN T, Engine Performance Wiring Diagram (3 of 5) for Chevrolet Silverado 2003 3500 List of elements for 5.3L VIN T, Engine Performance Wiring Diagram (3 of 5) for Chevrolet Silverado 2003 3500: 39 (4l60e) (4l60e) s 1-2 sol 2-3 sol 3-2 sol A red A/t fluid pressure manual valve position switch Automatic transaxle Brake fuse 10a C12 Camshaft position sensor (top center rear of engine) Engine oil pressure (eop) sensor (top rear of engine) Evaporative emissions (evap) canister purge solenoid (behind throttle body) Evaporative emissions canister vent solenoid (right front side of fuel tank) F12 Fuel tank pressure sensor (in fuel tank) Hot at all times Hot in run Instrument cluster system Left i/p fuse block Manifold absolute pressure sensor (top rear of engine) N pnk P red Pc sol valve Pnk Pnk a Red Red/ Rev S150 Stop lps fuse 20a Stop- lamp switch (top of brake pedal bracket) Tan Tcc pwm sol Tcc sol Tft sensor Under- hood fuse block Underhood fuse block Vehicle speed sensor (rear of transmission/ transfer case) 5.3L VIN T, Engine Performance Wiring Diagram (4 of 5) for Chevrolet Silverado 2003 3500 List of elements for 5.3L VIN T, Engine Performance Wiring Diagram (4 of 5) for Chevrolet Silverado 2003 3500: 43 (behind accelerator pedal) accelerator pedal position sensor (in transmission) (4l80e) automatic transmission input shaft speed sensor 4ws fuse 15a A10 Act cntrl App sens 1 App sens 2 Cruise control system Cruise req Data E11 Ect/ecm fuse 15a Fuel composition sensor (flex fuel) G103 (right rear of engine) G104 (left rear of engine) Gnd Ground Hot at all times Hot in run & start Hot in run or start Iat sensor Ign Ign0 fuse 10a Intake air temperature (iat)/ mass airflow (maf) sensor (in air induction tube) Left i/p fuse block Not used Pnk R/a input Red Ref low S/c input S102 S103 Signal Stp lp in Tac ctrl Tan Throttle actuator control module (rear of engine compt) Throttle body Tp sens 1 Tp sens 2 Underhood fuse block Veh stop fuse 15a 5.3L VIN T, Engine Performance Wiring Diagram (5 of 5) for Chevrolet Silverado 2003 3500 List of elements for 5.3L VIN T, Engine Performance Wiring Diagram (5 of 5) for Chevrolet Silverado 2003 3500: 85 (in ignition coil jumper harness) (in injector jumper harness) (left rear of engine) g104 (left side of engine) g102 1-2 ss ctrl 2-3 ss ctrl 4wd low sig A/c system A12 Air conditioning system Anti-lock brakes system At iss high sig At iss low sig Axle sw sig B10 B11 Clu rly ctrl Crank fuse 10a Crank volt Css sig Ctrl Cycle sig Delivered torq Evap canp ctrl Evap vent ctrl Exc seo Fuel lev sens Fuel lev sig Fuel press sig G103 (right rear of engine) Gnd Ho2s htr low Ho2s low ctrl Hot at all times Hot in run & start Hot in start Iat sig Ign Ign ctrl Ign feed Ignition coils Ind ctrl Instrument cluster system Instrument panel cluster Ipc/dic fuse 10a Logic Maf sig Malfunction indicator lamp Map sig Mil ctrl Nca Nca nca Pc sol hi ctrl Pc sol lo ctrl Pcm1 fuse 15a Pmp rly ctrl Pnk Pnk d Powertrain control module (left front of engine compt) Press sens sig Prnd c sig Red Red c Ref lo Ref low Rpm out S103 S151 S152 S153 S154 S157 Seo Seo b1 fuse 15a Spark plug Starting/charging system Tan Tcc pwm ctrl Tcc sol ctrl Tft sens sig Transmissions system Underhood fuse block Vss high sig Vss low sig Vss out
6.0L VIN U 6.0L VIN U, Engine Performance Wiring Diagram (1 of 5) for Chevrolet Silverado 2003 3500 List of elements for 6.0L VIN U, Engine Performance Wiring Diagram (1 of 5) for Chevrolet Silverado 2003 3500: 67 (below steering column) data link connector (lower right rear of engine) crankshaft position (ckp) sensor +5v 3-2 ss ctrl A/c system Anti-lock brakes sys Body control module (below steering column) Brk sw sig C10 Ckp sig Cls 2 data Cmp sig Cpp sw sig D10 E10 E11 Ect sig Electronic suspension system Fuel comp sig G103 (right rear of engine) Gnd Ho2s hi sig Ho2s lo Hot at all times Hot in accy, run & start Hot in run & start Ign Ign 0 fuse 10a Inj 1 ctrl Inj 2 ctrl Inj 3 ctrl Inj 4 ctrl Inj 5 ctrl Inj 6 ctrl Inj 7 ctrl Inj 8 ctrl Inj1 fuse 15a Inj2 fuse 15a Injectors Ks signal Left i/p fuse block Lev sw sig Lift/dive sig O2a fuse 15a O2b fuse 15a Oil lev sw sig Pcmb fuse 20a Pnk Pnk a Powertrain control module (left front of engine compt) Prnd a sig Prnd b sig Prnd p sig Range b Range c Red Ref low Ref low (a/t) Req torq sig Rly ctrl S103 S110 Serial data Sp205 (in i/p harness) Starting/ charging system Tan Under- hood fuse block 6.0L VIN U, Engine Performance Wiring Diagram (2 of 5) for Chevrolet Silverado 2003 3500 List of elements for 6.0L VIN U, Engine Performance Wiring Diagram (2 of 5) for Chevrolet Silverado 2003 3500: 36 (4l60) (4l80) (dual tanks) (in secondary fuel tank) fuel pump & sender assembly (secondary) (left rear of engine) g104 (not used) (right rear of engine) Coolant level switch (in coolant reservoir) Engine coolant temperature sensor (front of left cylinder head) Engine oil level switch (right side of oil pan) Fuel pump & sender assembly (primary) (in fuel tank) Fuel pump relay Fuel pump relay (secondary) (dual tanks) (on underhood fuse block bracket) G103 G103 (right rear of engine) G104 (left rear of engine) G110 (left front body mount) Heated oxygen sensor (bank 1 sensor 1) (left exh pipe, before converter) Heated oxygen sensor (bank 1 sensor 2) (left exh pipe, after converter) Heated oxygen sensor (bank 2 sensor 1) (right exh pipe, before converter) Heated oxygen sensor (bank 2 sensor 2) (right exh pipe, after converter) Hot at all times Hot in run & start Knock sensor (under intake manifold) Nca Park/neutral position switch (left side of transmission) Pcm b fuse 20a Pcm1 fuse 15a Pnk Red S102 S103 S312 Tan Under- hood fuse block Underhood fuse block 6.0L VIN U, Engine Performance Wiring Diagram (3 of 5) for Chevrolet Silverado 2003 3500 List of elements for 6.0L VIN U, Engine Performance Wiring Diagram (3 of 5) for Chevrolet Silverado 2003 3500: 39 (4l60e) (4l60e) s 1-2 sol 2-3 sol 3-2 sol A red A/t fluid pressure manual valve position switch Automatic transaxle Brake fuse 10a C12 Camshaft position sensor (top center rear of engine) Engine oil pressure (eop) sensor (top rear of engine) Evaporative emissions (evap) canister purge solenoid (behind throttle body) Evaporative emissions canister vent solenoid (right front side of fuel tank) F12 Fuel tank pressure sensor (in fuel tank) Hot at all times Hot in run Instrument cluster system Left i/p fuse block Manifold absolute pressure sensor (top rear of engine) N pnk P red Pc sol valve Pnk Pnk a Red Red/ Rev S150 Stop lps fuse 20a Stop- lamp switch (top of brake pedal bracket) Tan Tcc pwm sol Tcc sol Tft sensor Under- hood fuse block Underhood fuse block Vehicle speed sensor (rear of transmission/ transfer case) 6.0L VIN U, Engine Performance Wiring Diagram (4 of 5) for Chevrolet Silverado 2003 3500 List of elements for 6.0L VIN U, Engine Performance Wiring Diagram (4 of 5) for Chevrolet Silverado 2003 3500: 43 (behind accelerator pedal) accelerator pedal position sensor (in transmission) (4l80e) automatic transmission input shaft speed sensor 4ws fuse 15a A10 Act cntrl App sens 1 App sens 2 Cruise control system Cruise req Data E11 Ect/ecm fuse 15a Fuel composition sensor (flex fuel) G103 (right rear of engine) G104 (left rear of engine) Gnd Ground Hot at all times Hot in run & start Hot in run or start Iat sensor Ign Ign0 fuse 10a Intake air temperature (iat)/ mass airflow (maf) sensor (in air induction tube) Left i/p fuse block Not used Pnk R/a input Red Ref low S/c input S102 S103 Signal Stp lp in Tac ctrl Tan Throttle actuator control module (rear of engine compt) Throttle body Tp sens 1 Tp sens 2 Underhood fuse block Veh stop fuse 15a 6.0L VIN U, Engine Performance Wiring Diagram (5 of 5) for Chevrolet Silverado 2003 3500 List of elements for 6.0L VIN U, Engine Performance Wiring Diagram (5 of 5) for Chevrolet Silverado 2003 3500: 85 (in ignition coil jumper harness) (in injector jumper harness) (left rear of engine) g104 (left side of engine) g102 1-2 ss ctrl 2-3 ss ctrl 4wd low sig A/c system A12 Air conditioning system Anti-lock brakes system At iss high sig At iss low sig Axle sw sig B10 B11 Clu rly ctrl Crank fuse 10a Crank volt Css sig Ctrl Cycle sig Delivered torq Evap canp ctrl Evap vent ctrl Exc seo Fuel lev sens Fuel lev sig Fuel press sig G103 (right rear of engine) Gnd Ho2s htr low Ho2s low ctrl Hot at all times Hot in run & start Hot in start Iat sig Ign Ign ctrl Ign feed Ignition coils Ind ctrl Instrument cluster system Instrument panel cluster Ipc/dic fuse 10a Logic Maf sig Malfunction indicator lamp Map sig Mil ctrl Nca Nca nca Pc sol hi ctrl Pc sol lo ctrl Pcm1 fuse 15a Pmp rly ctrl Pnk Pnk d Powertrain control module (left front of engine compt) Press sens sig Prnd c sig Red Red c Ref lo Ref low Rpm out S103 S151 S152 S153 S154 S157 Seo Seo b1 fuse 15a Spark plug Starting/charging system Tan Tcc pwm ctrl Tcc sol ctrl Tft sens sig Transmissions system Underhood fuse block Vss high sig Vss low sig Vss out
EXTERIOR LIGHTS Back-up Lamps Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for Back-up Lamps Wiring Diagram for Chevrolet Silverado 2003 3500: 26 (30 series chassis cab) (30 series except chassis cab) (below left side of dash) i/p relay block (left side of transmission) back-up lamp switch 10/20 series A/t A11 B/u lmp vlt B/u lmps sig B/u lp fuse 20a Back-up alarm Body control module (bcm) (on lower left side of dash, below steering column) F10 G302 (on left rear body mount) G401 (on spare tire hoist bracket) G403 (on left rear frame body mount bracket) Hot in run or start Left back-up lamp M/t Park/neutral position (pnp) switch (left side of transmission) Pnk Rear lamps junction block Right back-up lamp Trailer connector Trlr b/u fuse 10a Underhood fuse block (left side of eng compt, near battery) Exterior Lamps Wiring Diagram (1 of 3) for Chevrolet Silverado 2003 3500 List of elements for Exterior Lamps Wiring Diagram (1 of 3) for Chevrolet Silverado 2003 3500: 47 (30 series except chassis cab) (30 series chassis cab) 10/20 series Anl/ Auto Back-up lamps circuit Body control module (bcm) (on lower left side of dash, below steering column) C2 b2 Computer data lines system D10 Drl F11 Frt park fuse 10a G100 (lower left side of radiator core support) G203 (behind left side of dash, near left "a" pillar) G302 (on left rear body mount) G401 (on spare tire hoist bracket) G403 (on left rear frame body mount bracket) Hazard switch Head Headlamp switch Hot at all times Hot in run and start I/p relay block Ign e fuse 10a Left Left front marker lamp Left front park/ turn signal lamp Park Park lamp relay Pnk Prk lmp on Prk lmp rly Red Right Right front marker lamp Right front park/ turn signal lamp S100 S101 S217 Serial data Stud 1 fuse 40a Stud 2 fuse 30a To trl park fuse (diagram 2 0f 3) Trailer connector Turn signal/ multi- function switch Under- hood fuse block (on left side of engine compt) Exterior Lamps Wiring Diagram (2 of 3) for Chevrolet Silverado 2003 3500 List of elements for Exterior Lamps Wiring Diagram (2 of 3) for Chevrolet Silverado 2003 3500: 60 (30 series except chassis cab) (30 series chassis cab) (behind right side of dash, near right "a" pillar) g200 (w/ roof marker lamps) (w/ pto) 10/20 series A c3 A left rear marker lamp b A12 C1 b C1 d C1 g C1 h C2 d C3 b6 C3 h C4 f C6 right i/p fuse block Clearance lamps D12 E11 F12 From a frt park fuse (diagram 1 0f 3) G302 (on left rear body mount) G304 (except crewcab) (under left front seat) G305 (crewcab) (on left "b" pillar) G401 (on spare tire hoist bracket) G403 (on left rear frame body mount bracket) Hot at all times I/p relay block Int park fuse 10a Interior lights system Left license lamp Left rear turn signal Left roof marker lamp Left tail/ stop- lamp Lr park fuse 10a Rear lamps junction block Red Right i/p fuse block Right license lamp Right rear marker lamp Right rear turn signal Right roof marker lamp Right tail/ stop- lamp Roof beacon relay (at lower left "b" pillar Roof beacon switch Rr park fuse 10a S200 (in roof marker harness) S201 (in roof marker harness) S205 S206 (in i/p harn) S219 (in brake clutch harn) S336 (w/ thermo console) Seo b1 fuse 15a Seo b2 fuse 30a Stop lp fuse 25a Stop- lamp switch Trl park fuse 15a Under- hood fuse block (on left side of engine compt) Exterior Lamps Wiring Diagram (3 of 3) for Chevrolet Silverado 2003 3500 List of elements for Exterior Lamps Wiring Diagram (3 of 3) for Chevrolet Silverado 2003 3500: 57 (behind right side of dash, near right "a" pillar) (w/ level 3 convenience package) A11 Battery C10 C3 e1 Center high mounted stop lamp (chmsl) Computer data lines system D10 Driver door module (ddm) (behind drivers door trim panel, below switch assembly) Driver outside rearview mirror E10 Ext- erior illum lamp F10 Flash fuse 25a Front passenger door module (fpdm) (behind front pass- engers door trim panel, below switch assembly) G200 G200 (behind right side of dash, near right "a" pillar) G203 (behind left side of dash, near left "a" pillar) Ground Hazard sw Hot at all times I/p relay block I/p relay block (below left side of dash) Instrument panel cluster (ipc) Left i/p fuse block (on lower left side of dash) Left turn ind Logic Lr lamp volt Lt door lmp gnd Lt door lmp pwr Lt trlr st/trn fuse 10a Lt turn fuse 10a Lt turn sig Lt turn sig volt Nca Passenger outside rearview mirror Red Right i/p fuse block Right turn ind Rr lamp volt Rt door lmp gnd Rt door lmp pwr Rt trlr st/trn fuse 10a Rt turn fuse 10a Rt turn sig Rt turn sig volt S202 S207 Serial data Stoplamp sw Tan Turn ind Turn signal/flasher module Under- hood fuse block Veh chmsl fuse 10a Veh stop fuse 15a
GROUND DISTRIBUTION Ground Distribution Wiring Diagram (1 of 5) for Chevrolet Silverado 2003 3500 List of elements for Ground Distribution Wiring Diagram (1 of 5) for Chevrolet Silverado 2003 3500: 65 (5.3l flex fuel) (in forward lamp harness) 5.3l flex fuel A/c compressor clutch A/c low pressure switch Active & elect shift transfer case Active & manual shift transfer case Auxiliary battery relay Battery (left) Battery (right) Brake fluid level switch Brake pressure differential switch C1 a C3 a Coolant level switch Daytime running lamp (drl) (left) Daytime running lamp (drl) (right) Diesel Dual tanks Electronic brake control module Except 4.3l base F/pmp relay Fog lamp (left) Fog lamp (right) Front axle actuator Fuel composition sensor Fuel pump Fuel pump & sender assembly (secondary) G100 (lower left of radiator core support) G101 G104 (left rear of engine block) G105 (lower right front of eng block) G106 (right front of engine block) G107 G110 (left front body mount) G304 (under left front seat) Gas Gas exc 4.3l Gas w/aux battery High beam headlamp (left) High beam headlamp (right) Horn (left) Horn (right) Ign 1 relay (gas) Inflatable restraint passenger presense module Inflatable restraint sensing & diagnostic module Low beam headlamp (left) Low beam headlamp (right) Manual shift transfer case Nca Park/turn signal lamp (left front) Park/turn signal lamp (right front) Rear wheel steering control module Roof beacon relay S102 (in engine harness) S107 Throttle actuator control module Transfer case shift control motor Transfer case shift control switch Underhood fuse block (left side of engine compt, near battery) W/ dual horns W/aux battery W/pto Washer fluid level sensor Windshield washer fluid pump Ground Distribution Wiring Diagram (2 of 5) for Chevrolet Silverado 2003 3500 List of elements for Ground Distribution Wiring Diagram (2 of 5) for Chevrolet Silverado 2003 3500: 54 Avalanche/ escalade ext C1 a C1 e C2 a C2 d Center high mount stop lamp Door courtesy lamp (left rear) Door courtesy lamp (right rear) Electronic suspension control module Engine oil level switch Escalade ext Exc 8.1l w/o calif lev Exc escalade ext G102 (left side of engine block) G103 (right rear of engine block) G305 (left "b" pillar) G306 (on right "b" pillar) Heated seat element (left rear) Heated seat element (right rear) Heated seat module (left rear) Heated seat module (right rear) Ignition coil 1 Ignition coil 2 Ignition coil 3 Ignition coil 4 Ignition coil 5 Ignition coil 6 Ignition coil 7 Ignition coil 8 Intake air temperature (iat)/mass airflow (maf) sensor Memory seat module Memory seat module (passenger) Mini wedge (door jamb switch) (left rear) Mini wedge (door jamb switch) (right rear) Nca Park/ neutral position switch Powertrain control module Rear object sensor control module Rear parking assist diagnostic connector Rear window defogger grid Roof beacon relay S103 (in engine harness) S104 (in engine harness) S110 (in engine harness) S156 (in engine harness) S157 (in right engine ignition coil jumper harness) S319 (in body harness) S332 S389 (right rear heated seat harness) S710 (left rear door harn) S810 (right rear door harn) Window contactor Window switch (right rear) Window switch) (left rear) Ground Distribution Wiring Diagram (3 of 5) for Chevrolet Silverado 2003 3500 List of elements for Ground Distribution Wiring Diagram (3 of 5) for Chevrolet Silverado 2003 3500: 76 (not used) A/t shift lock solenoid A12 Air temperature sensor assembly (inside front) Air temperature sensor assembly (inside rear) Analog clock Auto a/c Auto a/c exc avalanche/ escalade ext Auxiliary power outlet (bin) Auxiliary power outlet (console) Auxiliary power outlet (front) Blower motor Blower motor resistor assembly Bose exc luxury C1 4a C1 6c C1 a C1 b9 C1 d9 C1 f6 C2 f C3 c C3 d C4 a C5 e C7 f C8 f C9 a Cad Center high mounted stop lamp Cigar lighter Clearance lamps Clearance switch Courtesy lamp ("b" pillar) Courtesy lamp (right) Data link connector Dome lamp (front) Dome reading lamp (rear) Driver door module Exc cad ext Front passenger door module G200 (behind right side of dash, near right "a" pillar) Headlamp switch Heated seat switch (left rear) Heated seat switch (right rear) Hvac control assembly (front auxiliary) Hvac control module I/p compartment lamp I/p courtesy lamp (left) I/p relay block (below left side of dash, left of steering column) Inside rearview mirror Instrument panel cluster Left i/p fuse block (lower left side of dash) Lock relay Luxury Man a/c Overhead console Reading lamp (rear) Rear wheel steering switch Recirculation actuator Right i/p fuse block (lower right side of dash) Roof beacon switch Roof marker lamp (left) Roof marker lamp (right) S202 S205 S207 (in headliner harness) S352 Sunroof motor Sunroof relay Transfer case shift control switch Underhood lamp Unlock relay Visor lamp (left) Visor lamp (right) Windshield wiper motor module Ground Distribution Wiring Diagram (4 of 5) for Chevrolet Silverado 2003 3500 List of elements for Ground Distribution Wiring Diagram (4 of 5) for Chevrolet Silverado 2003 3500: 52 (not used) A12 Audio amplifier B12 Body control module C1 2c C1 a8 C1 b5 C1 c5 C1 d10 C2 a C2 b6 C3 b6 Column shift Data link connector Digital radio receiver Exc luxury G203 (near left "a" pillar) Hazard lamps switch Headlamp switch Hvac control module I/p relay block (below left side of dash, left of steering column Ignition key alarm switch Inflatable restraint steering wheel module coil Instrument panel cluster Left i/p fuse block (lower left side of dash) Luxury Multifunction accessory switch Nca Radio Rear parking assist disable switch Rear seat audio controller Rear seat entertainment assembly Remote playback device (cd player) Right i/p fuse block (lower right side of dash) S213 (in i/p harness) S216 (in steering column harn) S217 (in steering column harn) S330 S333 (in console harness) Steering wheel dic controls Steering wheel speed/ position sensor Tan Theft deterrent control module Tow/haul switch Traction control switch Transfer case shift control module Transmission shift select switch Turn signal hazard flasher module Turn signal/ multifunction switch Vehicle communication interface module Windshield wiper/washer switch Ground Distribution Wiring Diagram (5 of 5) for Chevrolet Silverado 2003 3500 List of elements for Ground Distribution Wiring Diagram (5 of 5) for Chevrolet Silverado 2003 3500: 60 (not used) Air temperature actuator Auto a/c Automatic level control compressor Auxiliary power outlet (rear) Backup lamp (left) Backup lamp (right) Blower motor (auxiliary) Blower motor (rear auxiliary) Cargo door key switch Center high mount control stop lamp Clearance lamp (left front) Clearance lamp (left rear) Clearance lamp (right rear) Dome lamp ("d" pillar) Door ajar switch (cargo) Door contact plate (left cargo body) Door contact plate (left cargo door) Door contact plate (right cargo body) Door contact plate (right cargo door) E c1 Electronic suspension control module Escalade Exc avalance/ escalade ext Four wheel steering G401 (left rear body mount) G410 (behind right rear quarterpanel) Hvac control assembly (rear auxiliary) Id lamp Lamp (right front) License lamp (left) License lamp (right) Liftgate ajar switch Liftgate ajar switch (left) Liftgate ajar switch (right) Liftgate key switch Mode actuator (rear) Rear a/c w/aux heater Rear a/c w/o aux heater Rear lamps junction block (inside of left rear frame rail) Rear object sensor control module Rear parking assist diagnostic connector Rear window defogger grid Rear window defogger grid (left cargo) Rear window defogger grid (right cargo) S901 (in liftgate harness) S913 S914 Splice pack sp410 (behind right quarterpanel) Splice pack sp410a (behing right rear quarter- panel) Stop/turn signal lamp (right) Stop/turn signal lamp) (left) Suburban Tail/stop lamp (left) Tail/stop lamp (right) Trailer connector W/ cargo doors W/cargo doors W/liftgate Wiper module (rear)
HEADLIGHTS Headlights Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for Headlights Wiring Diagram for Chevrolet Silverado 2003 3500: 58 (w/ cj2) (w/ t89) (w/o cj2) (w/o t89) A12 Ambient light sensor (on top center of dash) Ambient lt sens Anl/drl defeat Auto Body control module (bcm) (on lower left side of dash, below steering column) Drl fuse 10a Drl relay Drl rly ctrl Drl sw sig Flash to pass Fog lamp switch Fog lp fuse 15a Fog lp relay Fog lp rly ctrl Fog lp sw sig G100 (on lower left radiator core support) G104 (left rear of engine block) G203 (near left "a" pillar) Hdlp dim sw sig Hdlp hi bm relay Hdlp lo bm relay Head Headlamp switch Hi bm rly ctrl Hi hdlp lt fuse 10a Hi hdlp rt fuse 10a Hi/lo beam select Hlps on sig Hot at all times I/p relay block (below left of dash, left of steering column) Interior lights system Left daytime running lamp Left front fog lamp Left high beam head- lamp Left low beam head- lamp Lo bm rly ctrl Lo hdlp lt fuse 10a Lo hdlp rt fuse 10a Low ref Multifunction accessory switch Park Park brake switch (part of park brake assembly) Pk brake sig Right daytime running lamp Right front fog lamp Right high beam head- lamp Right low beam head- lamp S100 S101 S107 S213 Turn signal malfunction switch Underhood fuse block (left side of engine compt)
HORN Horn Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for Horn Wiring Diagram for Chevrolet Silverado 2003 3500: 12 (left side of engine compartment) C2 body control module (in center console) G100 (left radiator support bracket) Horn fuse 15a Horn relay Horn switch Hot at all times Left horn (left side of radiator support) Right horn (right side of radiator support) S101 S10o Underhood fuse block
INSTRUMENT CLUSTER Instrument Cluster Wiring Diagram (1 of 2) for Chevrolet Silverado 2003 3500 List of elements for Instrument Cluster Wiring Diagram (1 of 2) for Chevrolet Silverado 2003 3500: 83 (diesel only) 4wd ind A10 A11 A12 Abs ind Air bag ind B10 B11 B12 Batt Battery ind Body control module (bcm) (on lower left side of dash, below steering column) Brake ind C1 lamp Class 2 data Computer data lines Coolant temp gauge Coolant temp ind Cruise ind Dic fuel sig Dic mode sw Dic sw sig Dic toggle sw Eng speed sig Except seo Exterior lights system Fuel gauge G100 (on lower left of radiator core support) G200 (behind right side of dash, near right "a" pillar) G203 (behind left side of dash, near left "a" pillar) Ground High beam ind Hot at all times Hot in run or start Hour meter I/p dim I/p relay block (below left side of dash) Ign e fuse 10a Ignition Illumination Ingnition Instrument panel cluster Ipc serial data Ipc/dic fuse 10a Left turn Left turn ind Lo washer fluid Low fuel ind Message display Mil cntrl Nca Odometer Oil gauge Oil pressure ind Orn Pnk Prnd321 Red Reset Right turn Right turn ind S100 S202 Sba sig Seat belt ind Seo Seo b1 fuse 15a Seo ign fuse 10a Service engine soon ind (mil) Speedometer Tachometer Temp ind transmission Tow/haul ind Transmission shift select switch Transmission temp gauge Trip Underhood fuse block (left side of engine compt) Variable dimming Volts gauge Vss Wait to start ind (diesel only) Washer fluid level sensor (in washer fluid reservoir) Instrument Cluster Wiring Diagram (2 of 2) for Chevrolet Silverado 2003 3500 List of elements for Instrument Cluster Wiring Diagram (2 of 2) for Chevrolet Silverado 2003 3500: 50 (diesel only) (left rear of engine compt) 5 volt ref 5.3l flex fuel A10 C10 Class 2 data Computer data lines Coolant level switch (in coolant reservoir) Coolnt lev sig Cruise control module (ccm) (gas only, w/ auto cruise control) Diesel Eng speed sig Engine controls system Engine oil level switch (on right side of oil pan) Engine oil pressure sensor (on top rear of engine) Except 5.3l flex fuel Fuel Fuel lev sens Fuel pump & sender assembly (primary) (gas) (inside fuel tank) fuel level sensor (primary) (diesel) (inside fuel tank) Fuel pump & sender assembly (secondary) (gas) (inside fuel tank) fuel level sensor (secondary) (diesel) (inside fuel tank) G103 (on right rear of engine block) G104 (on left rear of engine block) G108 G203 (behind left side of dash, near left "a" pillar) Gas I/p relay block I/p relay block (below c1 left side of dash) Inflatable restraint steering wheel module coil Low ref Mil ctrl Nca Oil lev sw Oil pres sig Person- alization Powertrain control module (pcm) (gas) (on left front of engine compt) engine control module (ecm) (diesel) Radio (w/ luxury package) Rear object sensor control module (gas only, if equipped) Rear wheel steering control module (w/ 4 wheel steering) (at left rear of vehicle, near spare tire bracket) S102 S103 S216 S312 Select Steering wheel dic controls Trip Vss W/ dual tank W/o dual tank Wait to start
INTERIOR LIGHTS Courtesy Lamps Wiring Diagram (1 of 3) for Chevrolet Silverado 2003 3500 List of elements for Courtesy Lamps Wiring Diagram (1 of 3) for Chevrolet Silverado 2003 3500: 41 A11 B12 Body control module (lower left side of dash, below steering column) C3 a6 Cargo lamp low ctrl Class 2 data Class 2 serial data Convenience package comfort and decor level #3 Crew cab only Crew cab w/ ye9 Ctsy lamp ctrl Ctsy lamp on sig Ctsy lamp power Dome lamp switch Door ajar sig Driver door latch assembly Driver door module (ddm) (in left front door) F tan G305 (left "b" pillar) G306 (on right "b" pillar) Headlamp switch Int lamp defeat sig Int lamp defeat sw Left front door courtesy lamp Left rear door courtesy lamp (2003) Left rear door latch assembly Lf door ajar sig Low ref Lr door ajar sig Merchandised package luxury edition Rear dome lamp Rf door ajar sig Right rear door courtesy lamp (2003) Right rear door latch assembly Rr door ajar sig Sp205 (left side of dash) Tan W/ ye9 or w/ y91 W/o ye9 Y91 = Ye9 = Courtesy Lamps Wiring Diagram (2 of 3) for Chevrolet Silverado 2003 3500 List of elements for Courtesy Lamps Wiring Diagram (2 of 3) for Chevrolet Silverado 2003 3500: 22 (in headliner harness between overhead console reading lamps and i/p Cargo lamp Convenience package comfort and decor level 3 Crew cab w/ ye9 Dome Except crew cab w/ ye9 Left vanity mirror lamp Map lamps Merchandised package luxury edition Overhead console Reading Rear courtesy reading lamps (crew cab w/ ye9) Relay block) Right vanity mirror lamp S321 S345 Tan W/ y91 and crew cab w/ ye9 W/ ye9 and crew cab w/o ye9 W/ ye9 except crew cab Y91 = Ye9 = Courtesy Lamps Wiring Diagram (3 of 3) for Chevrolet Silverado 2003 3500 List of elements for Courtesy Lamps Wiring Diagram (3 of 3) for Chevrolet Silverado 2003 3500: 33 (2003) A12 B10 Bin lamp C10 C11 Cargo lamp switch Class 2 data Convenience package comfort and decor level #3 Ctsy lamp control Ctsy lamp power Door ajar sig Front passenger door courtesy light Front passenger door latch assembly Front passenger door module (fpdm) (in right front door) G200 (behind right side of dash, near right "a" pillar) G203 (near left "a" pillar) I/p compartment lamp I/p relay block (below left side of dash, left of steering column) Left i/p courtesy lamp Left i/p fuse block (under left side of dash) Low ref Merchandised package luxury edition Right i/p courtesy lamp (2003) Right i/p fuse block (lower right side of dash) S202 S205 S213 Tan W/ ye9 or w/ y91 W/o ye9 Y91 = Ye9 = Instrument Illumination Wiring Diagram (1 of 3) for Chevrolet Silverado 2003 3500 List of elements for Instrument Illumination Wiring Diagram (1 of 3) for Chevrolet Silverado 2003 3500: 37 2 hi ind 2 hi ind control 4 hi ind 4 hi ind control 4 lo ind 4 lo ind control 5 volt ref A11 A12 Auto 4wd ind B pnk B11 Body control module (lower left side of dash, below steering column) Crew cab only Diff lock ind control Dimming input Dimming return Drl off Drl off ind ctrl Fog lamp rly ctrl G305 (left "b" pillar) G306 (right "b" pillar) Headlamp on Headlamp on ind ctrl Headlamp switch Instrument panel cluster Instrument panel dimming Left rear window switch Np1 = transfer case, electric shift control, 2 speed np8 = transfer case active, 2 speed pushbutton control Pnk Red Right rear window switch S212 Transfer case shift control module (behind headlamp switch) Transfer case shift control switch W/ np1 W/ np8 Instrument Illumination Wiring Diagram (2 of 3) for Chevrolet Silverado 2003 3500 List of elements for Instrument Illumination Wiring Diagram (2 of 3) for Chevrolet Silverado 2003 3500: 31 (left rear of vehicle, near spare tire bracket) (near left "a" pillar) 2ws ind 2ws ind control 4ws ind 4ws ind control Control Fog lamp circuit G203 Hvac control module Inflatable restraint i/p module disable switch Inflatable restraint steering wheel module coil Lower left Lower right Multifunction accessory switch Nca Overhead console Power take off (pto) switch Rear wheel steering control module Rear wheel steering mode select switch Remote playback device-cd player S205 Steering wheel Tan Tow ind Tow mode ind Traction control switch Transfer case shift control switch Underhood fuse block (left side of engine compt, near battery) Upper left Upper right Instrument Illumination Wiring Diagram (3 of 3) for Chevrolet Silverado 2003 3500 List of elements for Instrument Illumination Wiring Diagram (3 of 3) for Chevrolet Silverado 2003 3500: 24 (lower left side of dash) A11 C10 Driver window/door lock switch Electronic suspension system Exterior lamps Firm indicator Fog lamp Front passenger window/door lock switch G100 (lower left side of radiator core support) G200 (behind right side of dash, near right "a" pillar) G203 (near left "a" pillar) Headlamp leveling switch I/p relay block (below left side of dash, left of steering column) Left i/p fuse block Multifunction accessory switch Right i/p fuse block (lower left side of dash) Roof beacon switch S101 S202 S345 Selectable ride switch W/ t89 W/ t96
MEMORY SYSTEMS Memory Systems Wiring Diagram (1 of 2) for Chevrolet Silverado 2003 3500 List of elements for Memory Systems Wiring Diagram (1 of 2) for Chevrolet Silverado 2003 3500: 66 (in driver seat harn) (not used) 5 volt ref Batt (+) C (not used) C10 h Class 2 serial data Computer data lines system Driver seat adjuster switch Frt dwn Frt up Frt vert dn sw sig Frt vert mtr dn ctrl Frt vert mtr pos sen Frt vert mtr up ctrl Frt vert up sw sig Fwd G305 (on left "b" pillar) Gnd Heated seat cus pwr Heated seat temp sig Horiz fwd sw sig Horiz mtr fwd ctrl Horiz mtr pos sen sig Horiz mtr rwd ctrl Horiz rwd sw sig Hot at all times Htd seat back ctrl Htd seat back pwr Htd seat cus ctrl Htd seat cus pwr I/p relay block (near left kick panel) Low ref Lum horiz pos sen sig Lum mtr fwd ctrl Lum mtr rwd ctrl Lum mtr rwd ctrl lum mtr rwd ctrl Memory seat module (under left front seat) Pnk Pnk pnk Rear vert dn sw sig Rear vert mtr pos sens Rear vert up sw sig Rec fwd Rec rwd Recline fwd sw sig Recline mtr fwd ctrl Recline mtr pos sen sig Recline mtr rwd ctrl Recline rwd sw sig Rr dwn Rr up Rr vert mtr dn ctrl Rr vert mtr up ctrl Rwd S311 S314 S315 (in driver seat harn) Seat circuit breaker 30a Seats system (heated seats circuit) Tan Torso blstr in sw sig Torso blstr out sw sig Torso bolster in ctrl Torso bolster out ctrl Trso blstr pos sens sig Memory Systems Wiring Diagram (2 of 2) for Chevrolet Silverado 2003 3500 List of elements for Memory Systems Wiring Diagram (2 of 2) for Chevrolet Silverado 2003 3500: 29 (in driver seat harn) s309 (in driver seat harn) s310 A red Batt (+) C (not used) Class 2 serial data Computer data lines system Driver door module (in driver's door) Driver seat bolster motor Driver seat bolster motor position sensor Driver seat bolster/ lumbar switch Driver seat front vertical motor Driver seat front vertical position sensor Driver seat horiz- ontal position sensor Driver seat lumbar motor Driver seat lumbar motor position sensor Driver seat rear vertical motor Driver seat rear vertical position sensor Driver seat recliner motor Driver seat recliner motor position sensor Exit Mem 1 sw sig Mem 2 sw sig Memory/ heated seat switch Out Pnk Red Set Tan
POWER DISTRIBUTION
4.3L VIN X 4.3L VIN X, Power Distribution Wiring Diagram (1 of 6) for Chevrolet Silverado 2003 3500 List of elements for 4.3L VIN X, Power Distribution Wiring Diagram (1 of 6) for Chevrolet Silverado 2003 3500: 75 (base) (exc base) (not used) 125a 40a 4ws fuse 15a 5.3l w/dual batteries A c7 A12 Abs fuse 60a Audio amplifier Auxiliary battery relay (right rear of eng compt) B c3 B c7 B c9 B11 c1 B12 c1 B2 c3 Battery (left) Battery (right) Battery (right) (w/aux battery) Battery fuse 125a Body control module C9 d Cig ltr fuse 15a Cigar lighter D2 c1 Data link connector Digital radio receiver E10 Eap fuse 15a Electronic brake control module Emergency vehicle roof lamp relay Evaporative emissions canister vent solenoid Except luxury F2 c1 Fuse holder Fuse holder (w/qs4) Fusible link G104 (left rear of eng block) G200 (behind right side of dash, near "a" pillar) Generator I/p relay block (left of steering column) Ign a fuse 40a Ign b fuse 40a Luxury Megafuse Nca Radio Radio amp fuse 30a Radio fuse 15a Rear seat audio (rsa) controller Rear wheel steering control module Red Rr wiper fuse 25a Rtd fuse 30a S102 S205 s303 Starter Starter relay Stud 1 fuse 40a Stud 2 fuse 30a Sunroof fuse 25a Tbc batt fuse 10a To 4wd fuse (diagram 5 of 6) To ignition switch (diagram 5 of 6) To ignition switch (diagram 6 of 6) To ipc/dic fuse (diagram 2 of 6) Trailer connector Underhood fuse block (left side of engine compt, near battery) Underhood junction block Upfitter battery junction block Vses/ ecas fuse 60a W/ vses W/aux battery W/o vses 4.3L VIN X, Power Distribution Wiring Diagram (2 of 6) for Chevrolet Silverado 2003 3500 List of elements for 4.3L VIN X, Power Distribution Wiring Diagram (2 of 6) for Chevrolet Silverado 2003 3500: 71 (cj2) (exc cj2) (not used) A c8 A g A10 Accessory power outlet Aux pwr fuse 20a Auxiliary power outlet (bin) Auxiliary power outlet (console) Auxiliary power outlet (front) B c3 B c5 B11 B11 c1 Battery monitor Blower fuse 40a Blower motor resistor assembly C1 c2 C1 f12 C10 C4 e6 C5 c1 D c4 D12 Defog relay E11 c1 Exc seo Except luxury F c8 F/pmp relay From sunroof fuse (diagram 1 of 6) G200 (near right 'a" pillar) G203 (near left "a" pillar) Garage door opener Hvac control module Hvac/ecas fuse 10a I/p relay block (left of steering column) In i/p harness) s335 Info fuse 15a Instrument panel cluster Ipc/dic fuse 10a Lh hid fuse 20a Luxury Overhead console Pcm b fuse 20a Powertrain control module Rear seat entertainment assembly Red Remote playback device (cd player) Rh hid fuse 20a Right i/p fuse block (lower right side of dash) Roof beacon relay Roof beacon switch Rr defog fuse 30a Rr hvac fuse 30a S336 S338 Seo Seo b1 fuse 15a Seo b2 fuse 30a Stop lp fuse 25a Stoplamp switch To lbec 1 fuse (diagram 3 of 6) Transfer case encoder motor Transfer case shift control module Transmission control module Trec fuse 30a Underhood fuse block (left side of engine compt, near battery) Vehicle communication interface module W/ thermo console W/o thermo console 4.3L VIN X, Power Distribution Wiring Diagram (3 of 6) for Chevrolet Silverado 2003 3500 List of elements for 4.3L VIN X, Power Distribution Wiring Diagram (3 of 6) for Chevrolet Silverado 2003 3500: 89 (below left side of dash, left of steering column) i/p relay block (left side of engine compt, near battery) underhood fuse block (lower left side of dash) (not used) (passenger seat harness) A c5 A c6 A/c comp fuse 10a A/c comp relay A10 c1 A12 A7 c1 Aux pwr 2 fuse 20a B c7 B10 B12 B7 c2 Body control module C c3 C9 c1 Ddm fuse 15a Driver door module Driver door unlock relay Drl fuse 10a Drl relay E c10 E c7 E10 E11 c1 E12 E3 c3 Ecc fuse 10a Etc/ecm fuse 15a Evaporative emissions (evap) canister purge solenoid Exc base F c3 F1 c1 Flash fuse 25a Fog lp fuse 15a Fog lp relay From mbec 1 fuse (diagram 3 of 6) From pcm b fuse (diagram 2 of 6) Front passenger door module Fuel composition sensor Fuel pump (fp) relay (secondary) G c4 G104 (on left rear of engine block) Hdlp-hi relay Hdlp-low relay Horn relay Ign 1 relay Intake air temperature (iat)/mass airflow (maf) sensor assembly Lbec 1 fuse 50a Lbec 2 fuse 50a Left i/p fuse block Lock relay Locks fuse 20a Lt doors circuit breaker 25a Lumbar bolster switch (front passenger) M c4 Mbec 1 fuse 50a Memory seat module Park lp relay Pcm 1 fuse 15a Pdm fuse 15a Pnk Powertrain control module Red Right i/p fuse block (lower right side of dash) Rt door circuit breaker 25a S102 S328 Sba fuse 15a Seat adjuster switch (driver) Seat adjuster switch (front passenger) Seat circuit breaker 30a Tbc 2a fuse 15a Tbc 2b fuse 15a Tbc 2c fuse 15a Throttle actuator control module (8.1l) To ign 1 relay (diagram 3 of 6) To inj 1 fuse (diagram 4 of 6) To seo ign fuse (diagram 6 of 6) Turn signal/ hazard flasher module Unlock relay W/s wash fuse 15a W/s wash relay Window switch (left rear) (crew cab) Window switch (right rear) 4.3L VIN X, Power Distribution Wiring Diagram (4 of 6) for Chevrolet Silverado 2003 3500 List of elements for 4.3L VIN X, Power Distribution Wiring Diagram (4 of 6) for Chevrolet Silverado 2003 3500: 39 (4.3l) (4.8l, 5.3, 6.0l) (exc 4.3l) (left side of engine, compt, near battery) underhood fuse block (not used) 4.3l 4.3l, 4.8l, 5.3l, 6.0l 4.8l, 5.3, 6.0l 4.8l, 5.3l, 6.0l, 8.1l 8.1l C10 D10 E10 From pcm 1 fuse (diagram 3 of 6) Fuel injector 1 Fuel injector 2 Fuel injector 3 Fuel injector 4 Fuel injector 5 Fuel injector 6 Fuel injector 7 Fuel injector 8 Ignition coil 1 Ignition coil 2 Ignition coil 3 Ignition coil 4 Ignition coil 5 Ignition coil 6 Ignition coil 7 Ignition coil 8 Ignition control module Inj 1 fuse 15a Inj 2 fuse 15a Pnk Pnk a S152 (left engine ignition coil jumper harn) S153 (right engine ignition coil jumper harn) S154 (right engine ignition coil jumper harn) S155 4.3L VIN X, Power Distribution Wiring Diagram (5 of 6) for Chevrolet Silverado 2003 3500 List of elements for 4.3L VIN X, Power Distribution Wiring Diagram (5 of 6) for Chevrolet Silverado 2003 3500: 59 (30 series) (10/20 series) (behind lower left side of dash) left i/p fuse block (not used) (steering column harness) s240 4wd fuse 15a Acc Air temperature actuator (left) Air temperature actuator (right) Automatic transmission B10 a1 Body control module Brake fuse 10a C1 c9 C1 d12 C1 e8 C175 C2 c2 C4 b C4 c Clutch start switch Crank fuse 10a Cruise Cruise control module Cruise control on/off switch Cruise fuse 10a E11 Electronic brake control module Exc m74 transmission F10 From auxiliary battery relay (diagram 1 of 6) From ign a fuse (diagram 1 of 6) Front axle actuator Htr/ac fuse 30a Hvac 1 fuse 10a Hvac control module Ign 0 fuse 10a Ign 3 fuse 10a Ignition switch Lock Mode actuator Off Pnk Power takeoff (pto) switch Powertrain control module Pto Rear wheel steering control module Recirculation actuator Red Right i/p fuse block (lower right side of dash) Run Start Steering wheel speed/ position sensor Stoplamp switch Tbc ign 0 fuse 10a Theft deterrent control module Tranmission control module Transfer case shift control switch Turn signal multifunction switch Underhood fuse block (left side of engine compt, near battery) 4.3L VIN X, Power Distribution Wiring Diagram (6 of 6) for Chevrolet Silverado 2003 3500 List of elements for 4.3L VIN X, Power Distribution Wiring Diagram (6 of 6) for Chevrolet Silverado 2003 3500: 62 (left side of engine compt, near battery) underhood fuse block (not used) A/c comp relay Acc Auxiliary power outlet B/u lp fuse 20a Body control module C c8 C1 b2 C10 C8 d8 Clutch start switch (m/t) D c5 D10 c1 Defog relay E c3 Exc 8.l w/o california lev Exc seo F11 F8 c2 From ign 1 relay (diagram 3 of 6) From ign b fuse (diagram 1 of 6) G203 (behind left side of dash, near left "a" pillar) Heated oxygen sensor bank 1 sensor 1 Heated oxygen sensor bank 1 sensor 2 Heated oxygen sensor bank 2 sensor 1 Heated oxygen sensor bank 2 sensor 2 I/p relay block (left of steering column) Ign e fuse 10a Ignition switch Inflatable restraint i/p module disable switch Inflatable restraint passenger presence module Inflatable restraint sensing & diagnostic module Inside rearview mirror Instrument panel cluster Left i/p fuse block (behind lower left side of dash) Lock Nca O2a fuse 15a O2b fuse 15a Off Park/neutral position switch (a/t) Pnk Rr wpr fuse 15a Run S337 S338 Selectable ride switch Seo Seo accy fuse 10a Seo ign fuse 10a Sir fuse 15a Start Tbc accy fuse 10a Tbc ign 1 fuse 10a Thermo cupholder assembly Turn signal/ multifunction switch Upfitter battery junction block W/ thermo console W/o thermo console Windshield wiper motor module Ws wpr fuse 25a
4.8L VIN V 4.8L VIN V, Power Distribution Wiring Diagram (1 of 6) for Chevrolet Silverado 2003 3500 List of elements for 4.8L VIN V, Power Distribution Wiring Diagram (1 of 6) for Chevrolet Silverado 2003 3500: 75 (base) (exc base) (not used) 125a 40a 4ws fuse 15a 5.3l w/dual batteries A c7 A12 Abs fuse 60a Audio amplifier Auxiliary battery relay (right rear of eng compt) B c3 B c7 B c9 B11 c1 B12 c1 B2 c3 Battery (left) Battery (right) Battery (right) (w/aux battery) Battery fuse 125a Body control module C9 d Cig ltr fuse 15a Cigar lighter D2 c1 Data link connector Digital radio receiver E10 Eap fuse 15a Electronic brake control module Emergency vehicle roof lamp relay Evaporative emissions canister vent solenoid Except luxury F2 c1 Fuse holder Fuse holder (w/qs4) Fusible link G104 (left rear of eng block) G200 (behind right side of dash, near "a" pillar) Generator I/p relay block (left of steering column) Ign a fuse 40a Ign b fuse 40a Luxury Megafuse Nca Radio Radio amp fuse 30a Radio fuse 15a Rear seat audio (rsa) controller Rear wheel steering control module Red Rr wiper fuse 25a Rtd fuse 30a S102 S205 s303 Starter Starter relay Stud 1 fuse 40a Stud 2 fuse 30a Sunroof fuse 25a Tbc batt fuse 10a To 4wd fuse (diagram 5 of 6) To ignition switch (diagram 5 of 6) To ignition switch (diagram 6 of 6) To ipc/dic fuse (diagram 2 of 6) Trailer connector Underhood fuse block (left side of engine compt, near battery) Underhood junction block Upfitter battery junction block Vses/ ecas fuse 60a W/ vses W/aux battery W/o vses 4.8L VIN V, Power Distribution Wiring Diagram (2 of 6) for Chevrolet Silverado 2003 3500 List of elements for 4.8L VIN V, Power Distribution Wiring Diagram (2 of 6) for Chevrolet Silverado 2003 3500: 71 (cj2) (exc cj2) (not used) A c8 A g A10 Accessory power outlet Aux pwr fuse 20a Auxiliary power outlet (bin) Auxiliary power outlet (console) Auxiliary power outlet (front) B c3 B c5 B11 B11 c1 Battery monitor Blower fuse 40a Blower motor resistor assembly C1 c2 C1 f12 C10 C4 e6 C5 c1 D c4 D12 Defog relay E11 c1 Exc seo Except luxury F c8 F/pmp relay From sunroof fuse (diagram 1 of 6) G200 (near right 'a" pillar) G203 (near left "a" pillar) Garage door opener Hvac control module Hvac/ecas fuse 10a I/p relay block (left of steering column) In i/p harness) s335 Info fuse 15a Instrument panel cluster Ipc/dic fuse 10a Lh hid fuse 20a Luxury Overhead console Pcm b fuse 20a Powertrain control module Rear seat entertainment assembly Red Remote playback device (cd player) Rh hid fuse 20a Right i/p fuse block (lower right side of dash) Roof beacon relay Roof beacon switch Rr defog fuse 30a Rr hvac fuse 30a S336 S338 Seo Seo b1 fuse 15a Seo b2 fuse 30a Stop lp fuse 25a Stoplamp switch To lbec 1 fuse (diagram 3 of 6) Transfer case encoder motor Transfer case shift control module Transmission control module Trec fuse 30a Underhood fuse block (left side of engine compt, near battery) Vehicle communication interface module W/ thermo console W/o thermo console 4.8L VIN V, Power Distribution Wiring Diagram (3 of 6) for Chevrolet Silverado 2003 3500 List of elements for 4.8L VIN V, Power Distribution Wiring Diagram (3 of 6) for Chevrolet Silverado 2003 3500: 89 (below left side of dash, left of steering column) i/p relay block (left side of engine compt, near battery) underhood fuse block (lower left side of dash) (not used) (passenger seat harness) A c5 A c6 A/c comp fuse 10a A/c comp relay A10 c1 A12 A7 c1 Aux pwr 2 fuse 20a B c7 B10 B12 B7 c2 Body control module C c3 C9 c1 Ddm fuse 15a Driver door module Driver door unlock relay Drl fuse 10a Drl relay E c10 E c7 E10 E11 c1 E12 E3 c3 Ecc fuse 10a Etc/ecm fuse 15a Evaporative emissions (evap) canister purge solenoid Exc base F c3 F1 c1 Flash fuse 25a Fog lp fuse 15a Fog lp relay From mbec 1 fuse (diagram 3 of 6) From pcm b fuse (diagram 2 of 6) Front passenger door module Fuel composition sensor Fuel pump (fp) relay (secondary) G c4 G104 (on left rear of engine block) Hdlp-hi relay Hdlp-low relay Horn relay Ign 1 relay Intake air temperature (iat)/mass airflow (maf) sensor assembly Lbec 1 fuse 50a Lbec 2 fuse 50a Left i/p fuse block Lock relay Locks fuse 20a Lt doors circuit breaker 25a Lumbar bolster switch (front passenger) M c4 Mbec 1 fuse 50a Memory seat module Park lp relay Pcm 1 fuse 15a Pdm fuse 15a Pnk Powertrain control module Red Right i/p fuse block (lower right side of dash) Rt door circuit breaker 25a S102 S328 Sba fuse 15a Seat adjuster switch (driver) Seat adjuster switch (front passenger) Seat circuit breaker 30a Tbc 2a fuse 15a Tbc 2b fuse 15a Tbc 2c fuse 15a Throttle actuator control module (8.1l) To ign 1 relay (diagram 3 of 6) To inj 1 fuse (diagram 4 of 6) To seo ign fuse (diagram 6 of 6) Turn signal/ hazard flasher module Unlock relay W/s wash fuse 15a W/s wash relay Window switch (left rear) (crew cab) Window switch (right rear) 4.8L VIN V, Power Distribution Wiring Diagram (4 of 6) for Chevrolet Silverado 2003 3500 List of elements for 4.8L VIN V, Power Distribution Wiring Diagram (4 of 6) for Chevrolet Silverado 2003 3500: 39 (4.3l) (4.8l, 5.3, 6.0l) (exc 4.3l) (left side of engine, compt, near battery) underhood fuse block (not used) 4.3l 4.3l, 4.8l, 5.3l, 6.0l 4.8l, 5.3, 6.0l 4.8l, 5.3l, 6.0l, 8.1l 8.1l C10 D10 E10 From pcm 1 fuse (diagram 3 of 6) Fuel injector 1 Fuel injector 2 Fuel injector 3 Fuel injector 4 Fuel injector 5 Fuel injector 6 Fuel injector 7 Fuel injector 8 Ignition coil 1 Ignition coil 2 Ignition coil 3 Ignition coil 4 Ignition coil 5 Ignition coil 6 Ignition coil 7 Ignition coil 8 Ignition control module Inj 1 fuse 15a Inj 2 fuse 15a Pnk Pnk a S152 (left engine ignition coil jumper harn) S153 (right engine ignition coil jumper harn) S154 (right engine ignition coil jumper harn) S155 4.8L VIN V, Power Distribution Wiring Diagram (5 of 6) for Chevrolet Silverado 2003 3500 List of elements for 4.8L VIN V, Power Distribution Wiring Diagram (5 of 6) for Chevrolet Silverado 2003 3500: 59 (30 series) (10/20 series) (behind lower left side of dash) left i/p fuse block (not used) (steering column harness) s240 4wd fuse 15a Acc Air temperature actuator (left) Air temperature actuator (right) Automatic transmission B10 a1 Body control module Brake fuse 10a C1 c9 C1 d12 C1 e8 C175 C2 c2 C4 b C4 c Clutch start switch Crank fuse 10a Cruise Cruise control module Cruise control on/off switch Cruise fuse 10a E11 Electronic brake control module Exc m74 transmission F10 From auxiliary battery relay (diagram 1 of 6) From ign a fuse (diagram 1 of 6) Front axle actuator Htr/ac fuse 30a Hvac 1 fuse 10a Hvac control module Ign 0 fuse 10a Ign 3 fuse 10a Ignition switch Lock Mode actuator Off Pnk Power takeoff (pto) switch Powertrain control module Pto Rear wheel steering control module Recirculation actuator Red Right i/p fuse block (lower right side of dash) Run Start Steering wheel speed/ position sensor Stoplamp switch Tbc ign 0 fuse 10a Theft deterrent control module Tranmission control module Transfer case shift control switch Turn signal multifunction switch Underhood fuse block (left side of engine compt, near battery) 4.8L VIN V, Power Distribution Wiring Diagram (6 of 6) for Chevrolet Silverado 2003 3500 List of elements for 4.8L VIN V, Power Distribution Wiring Diagram (6 of 6) for Chevrolet Silverado 2003 3500: 62 (left side of engine compt, near battery) underhood fuse block (not used) A/c comp relay Acc Auxiliary power outlet B/u lp fuse 20a Body control module C c8 C1 b2 C10 C8 d8 Clutch start switch (m/t) D c5 D10 c1 Defog relay E c3 Exc 8.l w/o california lev Exc seo F11 F8 c2 From ign 1 relay (diagram 3 of 6) From ign b fuse (diagram 1 of 6) G203 (behind left side of dash, near left "a" pillar) Heated oxygen sensor bank 1 sensor 1 Heated oxygen sensor bank 1 sensor 2 Heated oxygen sensor bank 2 sensor 1 Heated oxygen sensor bank 2 sensor 2 I/p relay block (left of steering column) Ign e fuse 10a Ignition switch Inflatable restraint i/p module disable switch Inflatable restraint passenger presence module Inflatable restraint sensing & diagnostic module Inside rearview mirror Instrument panel cluster Left i/p fuse block (behind lower left side of dash) Lock Nca O2a fuse 15a O2b fuse 15a Off Park/neutral position switch (a/t) Pnk Rr wpr fuse 15a Run S337 S338 Selectable ride switch Seo Seo accy fuse 10a Seo ign fuse 10a Sir fuse 15a Start Tbc accy fuse 10a Tbc ign 1 fuse 10a Thermo cupholder assembly Turn signal/ multifunction switch Upfitter battery junction block W/ thermo console W/o thermo console Windshield wiper motor module Ws wpr fuse 25a
5.3L VIN T 5.3L VIN T, Power Distribution Wiring Diagram (1 of 6) for Chevrolet Silverado 2003 3500 List of elements for 5.3L VIN T, Power Distribution Wiring Diagram (1 of 6) for Chevrolet Silverado 2003 3500: 75 (base) (exc base) (not used) 125a 40a 4ws fuse 15a 5.3l w/dual batteries A c7 A12 Abs fuse 60a Audio amplifier Auxiliary battery relay (right rear of eng compt) B c3 B c7 B c9 B11 c1 B12 c1 B2 c3 Battery (left) Battery (right) Battery (right) (w/aux battery) Battery fuse 125a Body control module C9 d Cig ltr fuse 15a Cigar lighter D2 c1 Data link connector Digital radio receiver E10 Eap fuse 15a Electronic brake control module Emergency vehicle roof lamp relay Evaporative emissions canister vent solenoid Except luxury F2 c1 Fuse holder Fuse holder (w/qs4) Fusible link G104 (left rear of eng block) G200 (behind right side of dash, near "a" pillar) Generator I/p relay block (left of steering column) Ign a fuse 40a Ign b fuse 40a Luxury Megafuse Nca Radio Radio amp fuse 30a Radio fuse 15a Rear seat audio (rsa) controller Rear wheel steering control module Red Rr wiper fuse 25a Rtd fuse 30a S102 S205 s303 Starter Starter relay Stud 1 fuse 40a Stud 2 fuse 30a Sunroof fuse 25a Tbc batt fuse 10a To 4wd fuse (diagram 5 of 6) To ignition switch (diagram 5 of 6) To ignition switch (diagram 6 of 6) To ipc/dic fuse (diagram 2 of 6) Trailer connector Underhood fuse block (left side of engine compt, near battery) Underhood junction block Upfitter battery junction block Vses/ ecas fuse 60a W/ vses W/aux battery W/o vses 5.3L VIN T, Power Distribution Wiring Diagram (2 of 6) for Chevrolet Silverado 2003 3500 List of elements for 5.3L VIN T, Power Distribution Wiring Diagram (2 of 6) for Chevrolet Silverado 2003 3500: 71 (cj2) (exc cj2) (not used) A c8 A g A10 Accessory power outlet Aux pwr fuse 20a Auxiliary power outlet (bin) Auxiliary power outlet (console) Auxiliary power outlet (front) B c3 B c5 B11 B11 c1 Battery monitor Blower fuse 40a Blower motor resistor assembly C1 c2 C1 f12 C10 C4 e6 C5 c1 D c4 D12 Defog relay E11 c1 Exc seo Except luxury F c8 F/pmp relay From sunroof fuse (diagram 1 of 6) G200 (near right 'a" pillar) G203 (near left "a" pillar) Garage door opener Hvac control module Hvac/ecas fuse 10a I/p relay block (left of steering column) In i/p harness) s335 Info fuse 15a Instrument panel cluster Ipc/dic fuse 10a Lh hid fuse 20a Luxury Overhead console Pcm b fuse 20a Powertrain control module Rear seat entertainment assembly Red Remote playback device (cd player) Rh hid fuse 20a Right i/p fuse block (lower right side of dash) Roof beacon relay Roof beacon switch Rr defog fuse 30a Rr hvac fuse 30a S336 S338 Seo Seo b1 fuse 15a Seo b2 fuse 30a Stop lp fuse 25a Stoplamp switch To lbec 1 fuse (diagram 3 of 6) Transfer case encoder motor Transfer case shift control module Transmission control module Trec fuse 30a Underhood fuse block (left side of engine compt, near battery) Vehicle communication interface module W/ thermo console W/o thermo console 5.3L VIN T, Power Distribution Wiring Diagram (3 of 6) for Chevrolet Silverado 2003 3500 List of elements for 5.3L VIN T, Power Distribution Wiring Diagram (3 of 6) for Chevrolet Silverado 2003 3500: 89 (below left side of dash, left of steering column) i/p relay block (left side of engine compt, near battery) underhood fuse block (lower left side of dash) (not used) (passenger seat harness) A c5 A c6 A/c comp fuse 10a A/c comp relay A10 c1 A12 A7 c1 Aux pwr 2 fuse 20a B c7 B10 B12 B7 c2 Body control module C c3 C9 c1 Ddm fuse 15a Driver door module Driver door unlock relay Drl fuse 10a Drl relay E c10 E c7 E10 E11 c1 E12 E3 c3 Ecc fuse 10a Etc/ecm fuse 15a Evaporative emissions (evap) canister purge solenoid Exc base F c3 F1 c1 Flash fuse 25a Fog lp fuse 15a Fog lp relay From mbec 1 fuse (diagram 3 of 6) From pcm b fuse (diagram 2 of 6) Front passenger door module Fuel composition sensor Fuel pump (fp) relay (secondary) G c4 G104 (on left rear of engine block) Hdlp-hi relay Hdlp-low relay Horn relay Ign 1 relay Intake air temperature (iat)/mass airflow (maf) sensor assembly Lbec 1 fuse 50a Lbec 2 fuse 50a Left i/p fuse block Lock relay Locks fuse 20a Lt doors circuit breaker 25a Lumbar bolster switch (front passenger) M c4 Mbec 1 fuse 50a Memory seat module Park lp relay Pcm 1 fuse 15a Pdm fuse 15a Pnk Powertrain control module Red Right i/p fuse block (lower right side of dash) Rt door circuit breaker 25a S102 S328 Sba fuse 15a Seat adjuster switch (driver) Seat adjuster switch (front passenger) Seat circuit breaker 30a Tbc 2a fuse 15a Tbc 2b fuse 15a Tbc 2c fuse 15a Throttle actuator control module (8.1l) To ign 1 relay (diagram 3 of 6) To inj 1 fuse (diagram 4 of 6) To seo ign fuse (diagram 6 of 6) Turn signal/ hazard flasher module Unlock relay W/s wash fuse 15a W/s wash relay Window switch (left rear) (crew cab) Window switch (right rear) 5.3L VIN T, Power Distribution Wiring Diagram (4 of 6) for Chevrolet Silverado 2003 3500 List of elements for 5.3L VIN T, Power Distribution Wiring Diagram (4 of 6) for Chevrolet Silverado 2003 3500: 39 (4.3l) (4.8l, 5.3, 6.0l) (exc 4.3l) (left side of engine, compt, near battery) underhood fuse block (not used) 4.3l 4.3l, 4.8l, 5.3l, 6.0l 4.8l, 5.3, 6.0l 4.8l, 5.3l, 6.0l, 8.1l 8.1l C10 D10 E10 From pcm 1 fuse (diagram 3 of 6) Fuel injector 1 Fuel injector 2 Fuel injector 3 Fuel injector 4 Fuel injector 5 Fuel injector 6 Fuel injector 7 Fuel injector 8 Ignition coil 1 Ignition coil 2 Ignition coil 3 Ignition coil 4 Ignition coil 5 Ignition coil 6 Ignition coil 7 Ignition coil 8 Ignition control module Inj 1 fuse 15a Inj 2 fuse 15a Pnk Pnk a S152 (left engine ignition coil jumper harn) S153 (right engine ignition coil jumper harn) S154 (right engine ignition coil jumper harn) S155 5.3L VIN T, Power Distribution Wiring Diagram (5 of 6) for Chevrolet Silverado 2003 3500 List of elements for 5.3L VIN T, Power Distribution Wiring Diagram (5 of 6) for Chevrolet Silverado 2003 3500: 59 (30 series) (10/20 series) (behind lower left side of dash) left i/p fuse block (not used) (steering column harness) s240 4wd fuse 15a Acc Air temperature actuator (left) Air temperature actuator (right) Automatic transmission B10 a1 Body control module Brake fuse 10a C1 c9 C1 d12 C1 e8 C175 C2 c2 C4 b C4 c Clutch start switch Crank fuse 10a Cruise Cruise control module Cruise control on/off switch Cruise fuse 10a E11 Electronic brake control module Exc m74 transmission F10 From auxiliary battery relay (diagram 1 of 6) From ign a fuse (diagram 1 of 6) Front axle actuator Htr/ac fuse 30a Hvac 1 fuse 10a Hvac control module Ign 0 fuse 10a Ign 3 fuse 10a Ignition switch Lock Mode actuator Off Pnk Power takeoff (pto) switch Powertrain control module Pto Rear wheel steering control module Recirculation actuator Red Right i/p fuse block (lower right side of dash) Run Start Steering wheel speed/ position sensor Stoplamp switch Tbc ign 0 fuse 10a Theft deterrent control module Tranmission control module Transfer case shift control switch Turn signal multifunction switch Underhood fuse block (left side of engine compt, near battery) 5.3L VIN T, Power Distribution Wiring Diagram (6 of 6) for Chevrolet Silverado 2003 3500 List of elements for 5.3L VIN T, Power Distribution Wiring Diagram (6 of 6) for Chevrolet Silverado 2003 3500: 62 (left side of engine compt, near battery) underhood fuse block (not used) A/c comp relay Acc Auxiliary power outlet B/u lp fuse 20a Body control module C c8 C1 b2 C10 C8 d8 Clutch start switch (m/t) D c5 D10 c1 Defog relay E c3 Exc 8.l w/o california lev Exc seo F11 F8 c2 From ign 1 relay (diagram 3 of 6) From ign b fuse (diagram 1 of 6) G203 (behind left side of dash, near left "a" pillar) Heated oxygen sensor bank 1 sensor 1 Heated oxygen sensor bank 1 sensor 2 Heated oxygen sensor bank 2 sensor 1 Heated oxygen sensor bank 2 sensor 2 I/p relay block (left of steering column) Ign e fuse 10a Ignition switch Inflatable restraint i/p module disable switch Inflatable restraint passenger presence module Inflatable restraint sensing & diagnostic module Inside rearview mirror Instrument panel cluster Left i/p fuse block (behind lower left side of dash) Lock Nca O2a fuse 15a O2b fuse 15a Off Park/neutral position switch (a/t) Pnk Rr wpr fuse 15a Run S337 S338 Selectable ride switch Seo Seo accy fuse 10a Seo ign fuse 10a Sir fuse 15a Start Tbc accy fuse 10a Tbc ign 1 fuse 10a Thermo cupholder assembly Turn signal/ multifunction switch Upfitter battery junction block W/ thermo console W/o thermo console Windshield wiper motor module Ws wpr fuse 25a
6.0L VIN U 6.0L VIN U, Power Distribution Wiring Diagram (1 of 6) for Chevrolet Silverado 2003 3500 List of elements for 6.0L VIN U, Power Distribution Wiring Diagram (1 of 6) for Chevrolet Silverado 2003 3500: 75 (base) (exc base) (not used) 125a 40a 4ws fuse 15a 5.3l w/dual batteries A c7 A12 Abs fuse 60a Audio amplifier Auxiliary battery relay (right rear of eng compt) B c3 B c7 B c9 B11 c1 B12 c1 B2 c3 Battery (left) Battery (right) Battery (right) (w/aux battery) Battery fuse 125a Body control module C9 d Cig ltr fuse 15a Cigar lighter D2 c1 Data link connector Digital radio receiver E10 Eap fuse 15a Electronic brake control module Emergency vehicle roof lamp relay Evaporative emissions canister vent solenoid Except luxury F2 c1 Fuse holder Fuse holder (w/qs4) Fusible link G104 (left rear of eng block) G200 (behind right side of dash, near "a" pillar) Generator I/p relay block (left of steering column) Ign a fuse 40a Ign b fuse 40a Luxury Megafuse Nca Radio Radio amp fuse 30a Radio fuse 15a Rear seat audio (rsa) controller Rear wheel steering control module Red Rr wiper fuse 25a Rtd fuse 30a S102 S205 s303 Starter Starter relay Stud 1 fuse 40a Stud 2 fuse 30a Sunroof fuse 25a Tbc batt fuse 10a To 4wd fuse (diagram 5 of 6) To ignition switch (diagram 5 of 6) To ignition switch (diagram 6 of 6) To ipc/dic fuse (diagram 2 of 6) Trailer connector Underhood fuse block (left side of engine compt, near battery) Underhood junction block Upfitter battery junction block Vses/ ecas fuse 60a W/ vses W/aux battery W/o vses 6.0L VIN U, Power Distribution Wiring Diagram (2 of 6) for Chevrolet Silverado 2003 3500 List of elements for 6.0L VIN U, Power Distribution Wiring Diagram (2 of 6) for Chevrolet Silverado 2003 3500: 71 (cj2) (exc cj2) (not used) A c8 A g A10 Accessory power outlet Aux pwr fuse 20a Auxiliary power outlet (bin) Auxiliary power outlet (console) Auxiliary power outlet (front) B c3 B c5 B11 B11 c1 Battery monitor Blower fuse 40a Blower motor resistor assembly C1 c2 C1 f12 C10 C4 e6 C5 c1 D c4 D12 Defog relay E11 c1 Exc seo Except luxury F c8 F/pmp relay From sunroof fuse (diagram 1 of 6) G200 (near right 'a" pillar) G203 (near left "a" pillar) Garage door opener Hvac control module Hvac/ecas fuse 10a I/p relay block (left of steering column) In i/p harness) s335 Info fuse 15a Instrument panel cluster Ipc/dic fuse 10a Lh hid fuse 20a Luxury Overhead console Pcm b fuse 20a Powertrain control module Rear seat entertainment assembly Red Remote playback device (cd player) Rh hid fuse 20a Right i/p fuse block (lower right side of dash) Roof beacon relay Roof beacon switch Rr defog fuse 30a Rr hvac fuse 30a S336 S338 Seo Seo b1 fuse 15a Seo b2 fuse 30a Stop lp fuse 25a Stoplamp switch To lbec 1 fuse (diagram 3 of 6) Transfer case encoder motor Transfer case shift control module Transmission control module Trec fuse 30a Underhood fuse block (left side of engine compt, near battery) Vehicle communication interface module W/ thermo console W/o thermo console 6.0L VIN U, Power Distribution Wiring Diagram (3 of 6) for Chevrolet Silverado 2003 3500 List of elements for 6.0L VIN U, Power Distribution Wiring Diagram (3 of 6) for Chevrolet Silverado 2003 3500: 89 (below left side of dash, left of steering column) i/p relay block (left side of engine compt, near battery) underhood fuse block (lower left side of dash) (not used) (passenger seat harness) A c5 A c6 A/c comp fuse 10a A/c comp relay A10 c1 A12 A7 c1 Aux pwr 2 fuse 20a B c7 B10 B12 B7 c2 Body control module C c3 C9 c1 Ddm fuse 15a Driver door module Driver door unlock relay Drl fuse 10a Drl relay E c10 E c7 E10 E11 c1 E12 E3 c3 Ecc fuse 10a Etc/ecm fuse 15a Evaporative emissions (evap) canister purge solenoid Exc base F c3 F1 c1 Flash fuse 25a Fog lp fuse 15a Fog lp relay From mbec 1 fuse (diagram 3 of 6) From pcm b fuse (diagram 2 of 6) Front passenger door module Fuel composition sensor Fuel pump (fp) relay (secondary) G c4 G104 (on left rear of engine block) Hdlp-hi relay Hdlp-low relay Horn relay Ign 1 relay Intake air temperature (iat)/mass airflow (maf) sensor assembly Lbec 1 fuse 50a Lbec 2 fuse 50a Left i/p fuse block Lock relay Locks fuse 20a Lt doors circuit breaker 25a Lumbar bolster switch (front passenger) M c4 Mbec 1 fuse 50a Memory seat module Park lp relay Pcm 1 fuse 15a Pdm fuse 15a Pnk Powertrain control module Red Right i/p fuse block (lower right side of dash) Rt door circuit breaker 25a S102 S328 Sba fuse 15a Seat adjuster switch (driver) Seat adjuster switch (front passenger) Seat circuit breaker 30a Tbc 2a fuse 15a Tbc 2b fuse 15a Tbc 2c fuse 15a Throttle actuator control module (8.1l) To ign 1 relay (diagram 3 of 6) To inj 1 fuse (diagram 4 of 6) To seo ign fuse (diagram 6 of 6) Turn signal/ hazard flasher module Unlock relay W/s wash fuse 15a W/s wash relay Window switch (left rear) (crew cab) Window switch (right rear) 6.0L VIN U, Power Distribution Wiring Diagram (4 of 6) for Chevrolet Silverado 2003 3500 List of elements for 6.0L VIN U, Power Distribution Wiring Diagram (4 of 6) for Chevrolet Silverado 2003 3500: 39 (4.3l) (4.8l, 5.3, 6.0l) (exc 4.3l) (left side of engine, compt, near battery) underhood fuse block (not used) 4.3l 4.3l, 4.8l, 5.3l, 6.0l 4.8l, 5.3, 6.0l 4.8l, 5.3l, 6.0l, 8.1l 8.1l C10 D10 E10 From pcm 1 fuse (diagram 3 of 6) Fuel injector 1 Fuel injector 2 Fuel injector 3 Fuel injector 4 Fuel injector 5 Fuel injector 6 Fuel injector 7 Fuel injector 8 Ignition coil 1 Ignition coil 2 Ignition coil 3 Ignition coil 4 Ignition coil 5 Ignition coil 6 Ignition coil 7 Ignition coil 8 Ignition control module Inj 1 fuse 15a Inj 2 fuse 15a Pnk Pnk a S152 (left engine ignition coil jumper harn) S153 (right engine ignition coil jumper harn) S154 (right engine ignition coil jumper harn) S155 6.0L VIN U, Power Distribution Wiring Diagram (5 of 6) for Chevrolet Silverado 2003 3500 List of elements for 6.0L VIN U, Power Distribution Wiring Diagram (5 of 6) for Chevrolet Silverado 2003 3500: 59 (30 series) (10/20 series) (behind lower left side of dash) left i/p fuse block (not used) (steering column harness) s240 4wd fuse 15a Acc Air temperature actuator (left) Air temperature actuator (right) Automatic transmission B10 a1 Body control module Brake fuse 10a C1 c9 C1 d12 C1 e8 C175 C2 c2 C4 b C4 c Clutch start switch Crank fuse 10a Cruise Cruise control module Cruise control on/off switch Cruise fuse 10a E11 Electronic brake control module Exc m74 transmission F10 From auxiliary battery relay (diagram 1 of 6) From ign a fuse (diagram 1 of 6) Front axle actuator Htr/ac fuse 30a Hvac 1 fuse 10a Hvac control module Ign 0 fuse 10a Ign 3 fuse 10a Ignition switch Lock Mode actuator Off Pnk Power takeoff (pto) switch Powertrain control module Pto Rear wheel steering control module Recirculation actuator Red Right i/p fuse block (lower right side of dash) Run Start Steering wheel speed/ position sensor Stoplamp switch Tbc ign 0 fuse 10a Theft deterrent control module Tranmission control module Transfer case shift control switch Turn signal multifunction switch Underhood fuse block (left side of engine compt, near battery) 6.0L VIN U, Power Distribution Wiring Diagram (6 of 6) for Chevrolet Silverado 2003 3500 List of elements for 6.0L VIN U, Power Distribution Wiring Diagram (6 of 6) for Chevrolet Silverado 2003 3500: 62 (left side of engine compt, near battery) underhood fuse block (not used) A/c comp relay Acc Auxiliary power outlet B/u lp fuse 20a Body control module C c8 C1 b2 C10 C8 d8 Clutch start switch (m/t) D c5 D10 c1 Defog relay E c3 Exc 8.l w/o california lev Exc seo F11 F8 c2 From ign 1 relay (diagram 3 of 6) From ign b fuse (diagram 1 of 6) G203 (behind left side of dash, near left "a" pillar) Heated oxygen sensor bank 1 sensor 1 Heated oxygen sensor bank 1 sensor 2 Heated oxygen sensor bank 2 sensor 1 Heated oxygen sensor bank 2 sensor 2 I/p relay block (left of steering column) Ign e fuse 10a Ignition switch Inflatable restraint i/p module disable switch Inflatable restraint passenger presence module Inflatable restraint sensing & diagnostic module Inside rearview mirror Instrument panel cluster Left i/p fuse block (behind lower left side of dash) Lock Nca O2a fuse 15a O2b fuse 15a Off Park/neutral position switch (a/t) Pnk Rr wpr fuse 15a Run S337 S338 Selectable ride switch Seo Seo accy fuse 10a Seo ign fuse 10a Sir fuse 15a Start Tbc accy fuse 10a Tbc ign 1 fuse 10a Thermo cupholder assembly Turn signal/ multifunction switch Upfitter battery junction block W/ thermo console W/o thermo console Windshield wiper motor module Ws wpr fuse 25a
POWER DOOR LOCKS Power Door Locks Wiring Diagram, Base for Chevrolet Silverado 2003 3500 List of elements for Power Door Locks Wiring Diagram, Base for Chevrolet Silverado 2003 3500: 50 (gasoline) (diesel) 87a A12 B10 B11 B12 Battery Body control module (on lower left side of dash, near steering column) C1 2c C1 c9 C1 d10 C1 d11 C1 d12 C1 f6 C3 b C3 f C7 f Door lock relay Door unlock relay Driver door lock actuator Driver door lock switch Driver unlock relay Front passenger door lock actuator Front passenger door lock switch G200 (below right side of dash) G203 (upper left kick panel) Hot at all times I/p relay block (behind left side of dash) Ign key sw Ignition key alarm switch (on ignition key cylinder) Instrument panel cluster Left i/p fuse block (behind left side of dash) Left i/p fuse block (lower left side of dash) Left rear door lock actuator Lock Lock ctrl Locks fuse 20a Pcm ecm (left front of engine compartment) Relay ctrl Right i/p fuse block (behind right side of dash) Right i/p fuse block (lower right side of dash) Right rear door lock actuator S202 (in i/p harn, between left i/p fuse & i/p relay blocks) Serial data Splice pack sp205 (under left knee bolster trim panel) Tan Tbc batt fuse 10a Underhood fuse block (on left side of engine compt) Unlock Unlock ctrl Power Door Locks Wiring Diagram, Up Level (1 of 2) for Chevrolet Silverado 2003 3500 List of elements for Power Door Locks Wiring Diagram, Up Level (1 of 2) for Chevrolet Silverado 2003 3500: 37 (gasoline) (diesel) (lower left side of dash) left i/p fuse block 87a A12 B12 Battery Body control module (on lower left side of dash, near steering column) C1 a2 C1 a7 C1 f6 C4 l (not used) Driver door module (inside driver door) F (not used) Front passenger door module (inside front passenger door) G200 (below right side of dash) G203 (upper left kick panel) Ground Hot at all times I/p relay block (behind left side of dash) Ign key sw Ignition key alarm switch (on ignition key cylinder) Key sw Key sw sig Left i/p fuse block (behind left side of dash) Left rear door lock actuator Lock ctrl Locks fuse 20a Pcm ecm (left front of engine compartment) Pdm fuse 10a Rear door lock relay Rear door unlock relay Right i/p fuse block (behind right side of dash) Right rear door lock actuator S202 (in i/p harn, between left i/p fuse & i/p relay blocks) Serial data Tan Unlock ctrl Power Door Locks Wiring Diagram, Up Level (2 of 2) for Chevrolet Silverado 2003 3500 List of elements for Power Door Locks Wiring Diagram, Up Level (2 of 2) for Chevrolet Silverado 2003 3500: 12 (lower right side of dash) right i/p fuse block C1 d12 Driver mini wedge door jamb switch Front passenger mini wedge door jamb switch Hot at all times Instrument panel cluster Key sw Lock Splice pack sp205 (under left knee bolster trim panel) Tan Tbc batt fuse 10a Underhood fuse block (on left side of engine compt)
POWER MIRRORS Electrochromic Mirror Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for Electrochromic Mirror Wiring Diagram for Chevrolet Silverado 2003 3500: 32 A12 A7 c1 Air temp sensor B11 B12 Back up lamp voltage output c5 Back up voltage Body control module (bcm) (on lower left side of dash, below steering column) Body relay block (under left side of dash, near kick panel) Computer data lines system Driver door module (ddm) Driver outside rearview mirror Electrochromic mirror G200 (near right "a" pillar) Ground Hot in run & start Ign 1 Inside rearview mirror Left i/p fuse block (behind lower left side of dash) Low ref Mir signal Nca On/off Outside air temperature sensor Pnk Right i/p fuse block (on lower right side of dash) S202 (in i/p harness) S207 (in headliner harness) S211 (in i/p harness) Serial data Sir fuse 15a Underhood fuse block Power Mirrors Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for Power Mirrors Wiring Diagram for Chevrolet Silverado 2003 3500: 43 5 volt ref B11 Battery Class 2 serial data Computer data lines system Ddm fuse 15a Driver door module (behind left front door trim panel, near handle) Driver outside rearview mirror Electro- chromic Folding/ telescoping motor Front passenger door module (behind right front door trim, near handle) Front passenger outside rearview mirror G200 (near right "a" pillar) Ground Heating element Horizontal Hot at all times Hvac control module (behind center of dash) I/p relay block (below left side of dash, left of steering column) Left Left i/p fuse block (lower left side of dash) Low ref Lt doors circuit breaker 25a Mir htr low ref Mir htr sply voltage Mir mtr dwn ctrl Mir mtr extend ctrl Mir mtr retract ctrl Mir mtr rt ctrl Mir position sens sig Mir sens low ref Mir signal Mtr position sens sig Pdm fuse 15a Pnk Red Right i/p fuse block (lower right side of dash) Rt door circuit breaker 25a Rt/dwn mtr common S202 (in i/p harness) Tan Vert posit sens sig Vertical
POWER SEATS Driver Seat Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for Driver Seat Wiring Diagram for Chevrolet Silverado 2003 3500: 20 Back C10 Crew cab Driver seat adjuster switch Driver seat front vertical motor Driver seat horizontal motor Driver seat rear vertical motor Except crew cab Front dn Front up Fwd G305 (on left "b" pillar) G306 (on right "b" pillar) Hot at all times I/p relay block Rear dn Rear up Red Seats circuit breaker 30a Tan Heated Seats Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for Heated Seats Wiring Diagram for Chevrolet Silverado 2003 3500: 61 (in driver seat jumper harness) (in driver's seat harness) s311 (not used) Back & cushion select Back only ind Back only indicator Back only select Batt Batt (+) Bck & csh select C1 4a C1 7e C1 a7 C1 c9 C1 f6 C10 h C2 f C3 c C3 d C3 f C4 a C7 c C7 e Computer data lines system Ddm fuse 15a Driver back heated seat element Driver cushion heated seat element Driver door module Element control Front passenger back heated seat element Front passenger cushion heated seat element Front passenger door module G200 (behind right side of dash, near right "a" pillar) G305 (on left "b" pillar) Gnd Ground Hi heat ind Hi heat indicator Hot at all times I/p relay block Left i/p fuse block Low heat ind Low heat indicator Low ref Lt doors circuit breaker 25a Med heat ind Med heat indicator Memory seat module (underside of left front seat) Memory/heated seat switch Nca Pdm fuse 10a Pnk Right i/p fuse block Rt doors circuit breaker 30a S202 S314 Seats circuit breaker 30a Serial data Switch power Tan Temp signal Passenger Full Feature Seat Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for Passenger Full Feature Seat Wiring Diagram for Chevrolet Silverado 2003 3500: 20 Back C10 Fr dn Fr up Front passenger seat adjuster switch Front passenger seat front vertical motor Front passenger seat horizontal motor Front passenger seat rear recliner motor Front passenger seat rear vertical motor Fwd G306 (on right "b" pillar) Hot at all times I/p relay block Red Rr dn Rr up S328 S329 Seats circuit breaker 30a Tan Passenger"s Lumbar Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for Passenger"s Lumbar Wiring Diagram for Chevrolet Silverado 2003 3500: 12 C10 e Front passenger lumbar/ bolster switch Front passenger seat bolster m0tor Front passenger seat lumbar m0tor G306 (on right "b" pillar) Hot at all times I/p relay block Out Pnk S328 S329 Seats circuit breaker 30a
POWER WINDOWS Power Windows Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for Power Windows Wiring Diagram for Chevrolet Silverado 2003 3500: 59 (crew cab) B+ volt B12 Bcm class 2 serial data Body control module (left side of dash) Body relay block C1 7b C10 C7 e Ddm class 2 serial data Driver door module Driver window motor Front passenger door module Front passenger window motor G305 (on left "b" pillar) G306 (on right "b" pillar) Ground Hot at all times Illumination Interior lights system Left front window Left i/p fuse block (left side of dash) Left rear window Left rear window motor Left window switch Logic Lt doors circuit breaker 25a Pwr wnd lockout lr sig Pwr wnd lockout lr signal Pwr wnd lockout rr sig Pwr wnd lockout rr signal Pwr wnd motor lf down cntrl Pwr wnd motor lf up cntrl Pwr wnd motor lr rear down cntrl Pwr wnd motor lr rear up cntrl Pwr wnd motor rf down cntrl Pwr wnd motor rf up cntrl Pwr wnd motor rr rear down cntrl Pwr wnd motor rr rear up cntrl Pwr wnd sw lr down sig Pwr wnd sw lr up sig Pwr wnd sw rr down sig Pwr wnd sw rr up sig Pwr wnd switch lr down signal Pwr wnd switch lr up signal Pwr wnd switch rr down signal Pwr wnd switch rr up signal Right i/p fuse block (right side of dash) Right rear window Right rear window motor Right window switch Rr window (crew cab) Rt doors circuit breaker 25a Splice pack sp205 Switch power Tan Window down Window right front Window up
RADIO Base Radio Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for Base Radio Wiring Diagram for Chevrolet Silverado 2003 3500: 48 A10 A11 A12 Antenna Aud out - B10 B11 B12 Bare Cell voice sig Coax Common aud sig Computer data lines system Digital radio antenna Digital radio receiver (if equipped) Drain wire G203 (near left "a" pillar) Ground Hot at all times I/p fuse block (below lower left side of dash) Left aud sig Left front door speaker Left front tweeter speaker Left i/p fuse block (on lower left side of dash) Left rear door speaker (except standard cab) left rear speaker (standard cab) Lf aud + Lf spk out+ Lf spk out- Lr spk out + Lr spk out - Radio Radio fuse 15a Rf spk out + Rf spk out - Right aud sig Right front door speaker Right front tweeter speaker Right i/p fuse block (on lower right side of dash) Right rear door speaker (except standard cab) right rear speaker (standard cab) Rr spk out+ Rr spk out- Rt aud + Serial data Tan Underhood fuse block (at left side of engine compartment) Vehicle communication interface module (behind passenger air bag module) Voice low ref Voice signal Mid-Line Radio Wiring Diagram, with Rear Seat Audio (1 of 3) for Chevrolet Silverado 2003 3500 List of elements for Mid-Line Radio Wiring Diagram, with Rear Seat Audio (1 of 3) for Chevrolet Silverado 2003 3500: 61 (in console harness) s330 A10 A11 A12 Antenna B10 B11 B12 B31 Bare Bcm class 2 serial data Body control module (on lower left side of dash) C201 Cell voice sig Common aud sig Computer data lines system Drain wire Enable sig Engine controls system G203 (near left "a" pillar) Ground Hot at all times I/p relay block (below lower left side of dash) Inflatable restraint steering wheel module coil Left aud sig Lf spk out+ Lf spk out- Lr aud sig+ Lr aud sig- Lr spk out + Lr spk out - Nca Pnk Program Radio Radio fuse 15a Radio mute Radio on sig Rear seat audio controller (on rear of center console) Remote radio control signal Rf spk out + Rf spk out - Right aud sig Rr aud sig+ Rr aud sig- Seek down Seek up Serial data Source down Source up Splice pack sp205 Steering wheel audio controls Tan Underhood fuse block (at left side of engine compartment) Vehicle communication interface module Voice Voice low ref Voice signal Volume down Volume up Vss signal Mid-Line Radio Wiring Diagram, with Rear Seat Audio (2 of 3) for Chevrolet Silverado 2003 3500 List of elements for Mid-Line Radio Wiring Diagram, with Rear Seat Audio (2 of 3) for Chevrolet Silverado 2003 3500: 50 A10 A11 A12 Audio amplifier B10 B11 B12 Bare Drain wire Ground Hot at all times I/p relay block (below lower left side of dash) L spk out+ L spk out- Left front door speaker Left front tweeter speaker Left i/p fuse block (on lower left side of dash) Left rear door speaker Left subwoofer Lf aud sig+ Lf aud sig- Lf spkr out+ Lf spkr out- Lr aud sig+ Lr aud sig- Lr spkr out+ Lr spkr out- Pnk R spk out+ R spk out- Radio fuse 15a Radio mute Radio on sig Rf aud sig+ Rf aud sig- Rf spkr out+ Rf spkr out- Right "d" pillar (except escalade ext) Right front door speaker Right front tweeter speaker Right i/p fuse block (on lower right side a of dash) Right subwoofer Rr aud sig+ Rr aud sig- Rr spkr out+ Rr spkr out- Rsa enable Subwoofer speaker Tan Underhood fuse block (at left side of engine compartment) Mid-Line Radio Wiring Diagram, with Rear Seat Audio (3 of 3) for Chevrolet Silverado 2003 3500 List of elements for Mid-Line Radio Wiring Diagram, with Rear Seat Audio (3 of 3) for Chevrolet Silverado 2003 3500: 25 Antenna Aud out - B11 Bare Coax Com aud sig Computer data lines system Data lines Digital radio antenna Digital radio receiver (if equipped) Drain wire G203 (near left "a" pillar) Ground Hot at all times I/p relay block (below lower left side of dash) Info fuse 15a Lf aud + Lt aud sig Nca Rear seat entertainment assembly (if equipped) Rt aud + Rt aud sig Serial data Splice pack sp250 Underhood fuse block (at left side of engine compartment) Mid-Line Radio Wiring Diagram, without Rear Seat Audio (1 of 3) for Chevrolet Silverado 2003 3500 List of elements for Mid-Line Radio Wiring Diagram, without Rear Seat Audio (1 of 3) for Chevrolet Silverado 2003 3500: 59 (in console harness) A10 A11 A12 Antenna B10 B11 B12 B31 Bare Bcm class 2 serial data Body control module C201 Cell voice sig Coax Common aud sig Drain wire Enable sig Engine controls system G203 (near left "a" pillar) Ground Hot at all times I/p relay block (below lower left side of dash) Inflatable restraint steering wheel module coil Left aud sig Lf spk out + Lf spk out - Lr aud sig + Lr aud sig - Nca Pnk Program Radio Radio fuse 15a Radio mute Radio on sig Remote radio control signal Rf spk out + Rf spk out - Right aud sig Rr aud sig + Rr aud sig - S330 Seek down Seek up Serial data Source down Source up Splice pack sp205 Steering wheel audio controls Tan Underhood fuse block (at left side of engine compartment) Vehicle communication interface module Voice Voice low ref Voice signal Volume down Volume up Vss signal Mid-Line Radio Wiring Diagram, without Rear Seat Audio (2 of 3) for Chevrolet Silverado 2003 3500 List of elements for Mid-Line Radio Wiring Diagram, without Rear Seat Audio (2 of 3) for Chevrolet Silverado 2003 3500: 52 A10 A11 A12 Audio amplifier B10 B11 B12 Bare C1 b2 Drain wire Ground Hot at all times I/p relay block (below lower left side of dash) L spk out+ L spk out- Left front door speaker Left front tweeter speaker Left i/p fuse block (on lower left side of dash) Left rear door speaker Left subwoofer Lf aud sig+ Lf aud sig- Lf spkr out+ Lf spkr out- Lr aud sig+ Lr aud sig- Lr spkr out+ Lr spkr out- Pnk R spk out+ R spk out- Radio amp fuse 30a Radio fuse 15a Radio mute Radio on sig Rf aud sig+ Rf aud sig- Rf spkr out+ Rf spkr out- Right front door speaker Right front tweeter speaker Right i/p fuse block (on lower right side a of dash) Right rear door speaker Right subwoofer Rr aud sig+ Rr aud sig- Rr spkr out+ Rr spkr out- Rsa enable Subwoofer speaker Tan Underhood fuse block (at left side of engine compartment) Mid-Line Radio Wiring Diagram, without Rear Seat Audio (3 of 3) for Chevrolet Silverado 2003 3500 List of elements for Mid-Line Radio Wiring Diagram, without Rear Seat Audio (3 of 3) for Chevrolet Silverado 2003 3500: 25 Antenna Aud out - B11 Bare Coax Com aud sig Computer data lines system Data lines Digital radio antenna Digital radio receiver (if equipped) Drain wire G203 (near left "a" pillar) Ground Hot at all times I/p relay block (below lower left side of dash) Info fuse 15a Lf aud + Lt aud sig Nca Rear seat entertainment assembly (if equipped) Rt aud + Rt aud sig Serial data Splice pack sp250 Underhood fuse block (at left side of engine compartment) Premium Sound Radio Wiring Diagram, with CD, with Rear Entertainment, with Digital Receiver (1 of 3) for Chevrolet Silverado 2003 3500 List of elements for Premium Sound Radio Wiring Diagram, with CD, with Rear Entertainment, with Digital Receiver (1 of 3) for Chevrolet Silverado 2003 3500: 58 (in console harness) A10 A11 A12 Antenna B10 B11 B12 B31 Bare Bcm class 2 serial data Body control module C201 Cell voice sig Coax Common aud sig Computer data lines system Drain wire G203 (near left "a" pillar) Ground Hot at all times I/p fuse block (below lower left side of dash) Inflatable restraint steering wheel module coil Left aud sig Lf aud sig+ Lf aud sig- Lr aud sig + Lr aud sig - Lr aud sig+ Lr aud sig- Nca Program Radio Radio fuse 15a Rear seat audio controller (on rear of center console) Remote radio control signal Rf aud sig + Rf aud sig - Right aud sig Rr aud sig+ Rr aud sig- S210 S333 Seek down Seek up Serial data Source down Source up Splice pack sp205 Steering wheel audio controls Tan Underhood fuse block (at left side of engine compartment) Vehicle communication interface module (behind right side of dash) Voice Voice low ref Voice signal Volume down Volume up Premium Sound Radio Wiring Diagram, with CD, with Rear Entertainment, with Digital Receiver (2 of 3) for Chevrolet Silverado 2003 3500 List of elements for Premium Sound Radio Wiring Diagram, with CD, with Rear Entertainment, with Digital Receiver (2 of 3) for Chevrolet Silverado 2003 3500: 45 A10 A11 A12 Audio amplifier B10 B11 B12 Bare Computer data lines system Drain wire Ground Hot at all times L spk out+ L spk out- Left front door speaker Left front tweeter speaker Left i/p fuse block (on lower left side l of dash) Left rear door speaker Left subwoofer Lf aud sig+ Lf aud sig- Lf spkr out+ Lf spkr out- Lr spkr out+ Lr spkr out- Mic sup volt Noise compensation microphone R spk out+ R spk out- Radio fuse 30a Rf aud sig+ Rf aud sig- Rf spkr out+ Rf spkr out- Right front door speaker Right front tweeter speaker Right i/p fuse block (on lower right side b of dash) Right rear door speaker Right subwoofer Rr spkr out+ Rr spkr out- Serial data Subwoofer speaker Tan Underhood fuse block (at left side of engine compartment) Premium Sound Radio Wiring Diagram, with CD, with Rear Entertainment, with Digital Receiver (3 of 3) for Chevrolet Silverado 2003 3500 List of elements for Premium Sound Radio Wiring Diagram, with CD, with Rear Entertainment, with Digital Receiver (3 of 3) for Chevrolet Silverado 2003 3500: 24 (near left "a" pillar) g203 Antenna Aud out - Bare Cd player remote playback device (if equipped) Coax Computer data lines system Digital radio antenna Digital radio receiver (if equipped) Dimming Drain wire Ground Hot at all times I/p fuse block (below lower left side of dash) Info fuse 15a Interior lights system Lf aud + Nca Rt aud + S335 Serial data Splice pack sp250 Tan Underhood fuse block (at left side of engine compartment) Premium Sound Radio Wiring Diagram, with CD (1 of 2) for Chevrolet Silverado 2003 3500 List of elements for Premium Sound Radio Wiring Diagram, with CD (1 of 2) for Chevrolet Silverado 2003 3500: 59 (in console harness) A10 A11 A12 Antenna B10 B11 B12 B31 Bare Bcm class 2 serial data Body control module C201 Cell voice sig Coax Common aud sig Computer data lines Drain wire G203 (near left "a" pillar) Ground Hot at all times I/p fuse block (below lower left side of dash) Inflatable restraint steering wheel module coil Left aud sig Lf aud sig+ Lf aud sig- Lr aud sig + Lr aud sig - Lr aud sig+ Lr aud sig- Nca Program Radio Radio fuse 15a Rear seat audio controller (on rear of center console) Remote radio control signal Rf aud sig + Rf aud sig - Right aud sig Rr aud sig+ Rr aud sig- S210 S333 Seek down Seek up Serial data Source down Source up Splice pack sp205 Steering wheel audio controls System Tan Underhood fuse block (at left side of engine compartment) Vehicle communication interface module (behind right side of dash) Voice Voice low ref Voice signal Volume down Volume up Premium Sound Radio Wiring Diagram, with CD (2 of 2) for Chevrolet Silverado 2003 3500 List of elements for Premium Sound Radio Wiring Diagram, with CD (2 of 2) for Chevrolet Silverado 2003 3500: 53 A10 A11 A12 Aud out - Audio amplifier B10 B11 B12 Bare Cd player remote playback device Computer data lines system Dimming Drain wire Ground Hot at all times Info fuse 15a Interior lights system L spk out+ L spk out- Left front door speaker Left front tweeter speaker Left i/p fuse block (on lower left side l of dash) Left rear door speaker Left subwoofer Lf aud + Lf aud sig+ Lf aud sig- Lf spkr out+ Lf spkr out- Lr spkr out+ Lr spkr out- Mic sup volt Noise compensation microphone R spk out+ R spk out- Radio fuse 30a Rf aud sig+ Rf aud sig- Rf spkr out+ Rf spkr out- Right front door speaker Right front tweeter speaker Right i/p fuse block (on lower right side b of dash) Right rear door speaker Right subwoofer Rr spkr out+ Rr spkr out- Rt aud + S335 Serial data Subwoofer speaker Tan Underhood fuse block (at left side of engine compartment) Premium Sound Radio Wiring Diagram, with Digital Radio Receiver (1 of 2) for Chevrolet Silverado 2003 3500 List of elements for Premium Sound Radio Wiring Diagram, with Digital Radio Receiver (1 of 2) for Chevrolet Silverado 2003 3500: 58 (in console harness) A10 A11 A12 Antenna B10 B11 B12 B31 Bare Bcm class 2 serial data Body control module C201 Cell voice sig Coax Common aud sig Computer data lines system Drain wire G203 (near left "a" pillar) Ground Hot at all times I/p fuse block (below lower left side of dash) Inflatable restraint steering wheel module coil Left aud sig Lf aud sig+ Lf aud sig- Lr aud sig + Lr aud sig - Lr aud sig+ Lr aud sig- Nca Program Radio Radio fuse 15a Rear seat audio controller (on rear of center console) Remote radio control signal Rf aud sig + Rf aud sig - Right aud sig Rr aud sig+ Rr aud sig- S210 S333 Seek down Seek up Serial data Source down Source up Splice pack sp205 Steering wheel audio controls Tan Underhood fuse block (at left side of engine compartment) Vehicle communication interface module (behind right side of dash) Voice Voice low ref Voice signal Volume down Volume up Premium Sound Radio Wiring Diagram, with Digital Radio Receiver (2 of 2) for Chevrolet Silverado 2003 3500 List of elements for Premium Sound Radio Wiring Diagram, with Digital Radio Receiver (2 of 2) for Chevrolet Silverado 2003 3500: 52 A10 A11 A12 Antenna Aud out - Audio amplifier B10 B11 B12 Bare Coax Computer data lines system Digital radio antenna Digital radio receiver Drain wire Ground Hot at all times L spk out+ L spk out- Left front door speaker Left front tweeter speaker Left i/p fuse block (on lower left side l of dash) Left rear door speaker Left subwoofer Lf aud + Lf aud sig+ Lf aud sig- Lf spkr out+ Lf spkr out- Lr spkr out+ Lr spkr out- Mic sup volt Noise compensation microphone R spk out+ R spk out- Radio amp fuse 30a Rf aud sig+ Rf aud sig- Rf spkr out+ Rf spkr out- Right front door speaker Right front tweeter speaker Right i/p fuse block (on lower right side b of dash) Right rear door speaker Right subwoofer Rr spkr out+ Rr spkr out- Rt aud + Serial data Subwoofer speaker Tan Underhood fuse block (at left side of engine compartment)
SHIFT INTERLOCK Shift Interlock Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for Shift Interlock Wiring Diagram for Chevrolet Silverado 2003 3500: 10 A/t shift lock control solenoid (on steering column) B/u lp fuse 20a Btsi fuse 10a G200 behind right side of dash, near right "a" pillar) Hot in run or start Park/ neutral position switch (left side of transmission) Pnk S202 Stoplamp switch (top of brake pedal) Underhood fuse block (at left side of engine compartment)
STARTING/CHARGING Charging Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for Charging Wiring Diagram for Chevrolet Silverado 2003 3500: 40 (at left side of eng compt, near battery) underhood junction block (not used) (w/ sba only) 5.3l w/dual batteries Auxiliary battery relay (right rear of eng compt) B12 Battery Charge indicator control Computer data lines Fusible link Fusible link (8.1l only) G100 (on lower left of radiator core support) G105 (on lower right front of eng block) G106 (on right front of eng block) G203 (behind left side of dash, near left "a" pillar) Generator Generator field duty cycle signal Ground Hot in run & start I/p relay block (below left side of dash, left of steering column) Ign 1 volt Ign e fuse 10a Instrument panel cluster Ipc class 2 serial data Left battery Logig Pnk Power distribution system Powertrain control module (pcm) or engine control module (ecm) (on left front of engine compartment) Red Right battery Right battery (w/aux battery) Seo ign fuse 10a Serial data class 2 Splice pack sp205 (in i/p harn) Starter solenoid Underhood fuse block (at left side of eng compt, near battery) W/ seo W/aux battery W/o seo Starting Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for Starting Wiring Diagram for Chevrolet Silverado 2003 3500: 48 (diesel) (except diesel) A/t Acc C1 a11 C1 a3 C1 a9 C1 b12 C2 a7 C2 d11 C2 e C2 f3 C2 f9 C2 g Clutch start switch (m/t) (on top of clutch pedal bracket) Clutch start switch sign Crank fuse 10a Crank sign D12 F11 Fuse holder G100 (on lower left of radiator core support) G105 (on lower right front of eng block) Ign a fuse 40a Ign b fuse 40a Ign e fuse 10a Ignition switch Left battery Lock M/t Off Park/neutral position switch (on left side of transmission) Pnk Power distribution system Powertrain control module (pcm) or engine control module (ecm) (on left front of engine compartment) Red Run Run off Start Starter enable relay ctrl Starter motor Starter relay Starter solenoid Starting/ charging system (fusible link) (8.1l only) Starting/ charging system (right battery) (5.3l w/ dual batteries) Ubderhood junction block (at left side of eng compt, near battery) Underhood fuse block (at left side of eng compt, near battery) Underhood fuse block (left side of eng compt, near battery)
SUPPLEMENTAL RESTRAINTS Supplemental Restraints Wiring Diagram (1 of 2) for Chevrolet Silverado 2003 3500 List of elements for Supplemental Restraints Wiring Diagram (1 of 2) for Chevrolet Silverado 2003 3500: 47 1362 (or 353) 2306 (or 371) Alo: w/ front passenger/ child presence detector C10 Class 2 serial data Control G200 (behind right side of dash, near right "a" pillar) G304 (under left front seat) Ground High control Hot in run or start I/p module disable switch signal I/p module suppression indicator control I/p relay block (below left side of dash, left of steering column) Ignition 1 voltage Igniton 1 volt Inflatable restraint i/p module (behind right side of dash) Inflatable restraint i/p module disable switch Inflatable restraint sensing/diagnostic module (under left front seat) Inflatable restraint steering wheel module Inflatable restraint steering wheel module coil Key switch Left inflatable restraint front end sensor (on left front of vehicle, by core supprt) Left signal Logic Low control Low reference Nca Off On-w/o alo auto-w/ alo Others Pnk Red Red (or pnk) Right inflatable restraint front end sensor (on right front of vehicle, by core supprt) Right signal S205 (in i/p harness) Shorting bar Signal Sir fuse 15a Stage 1 Stage 2 Tan Twisted pair wires Underhood fuse block (at left side of eng compt, near battery) W/ c99 only W/ front passenger/ child presence detector Supplemental Restraints Wiring Diagram (2 of 2) for Chevrolet Silverado 2003 3500 List of elements for Supplemental Restraints Wiring Diagram (2 of 2) for Chevrolet Silverado 2003 3500: 36 Air bag C10 Class 2 serial data Data link connector (under left side of dash, below steering column) Driver seat belt switch Front passenger seat belt switch G304 (under left front seat) Ground I/p mod disable sw sig I/p mod supp ind ctrl I/p relay block (below left side of dash, left of steering column) Ign Ignition 1 voltage Inflatable restraint passenger air bag on/off indicator Inflatable restraint passenger presence system (pps) module (front passenger seat) Inflatable restraint passenger presence system sensor Inflatable restraint passenger seat belt tension retractor sensor Inside rearview mirror instrument Instrument panel cluster Ipc class 2 serial data Left inflatable restraint seat position switch Memory systems Off Pass air bag off ind ctrl Pass air bag on ind ctrl Pass seat belt tens 5v ref Pass seat belt tens lo ref Pass seat belt tens sig Pnk Pps sens 5v ref Pps sens lo ref Pps sens sig Red Right inflatable restraint seat position switch Splice pack sp205 (in i/p harness) Tan
TRANSMISSION Transfer Case Wiring Diagram, 2-Speed Automatic for Chevrolet Silverado 2003 3500 List of elements for Transfer Case Wiring Diagram, 2-Speed Automatic for Chevrolet Silverado 2003 3500: 66 (behind right side of dash, near right "a" pillar) (left front of engine compt) powertrain control module (on left front body mount) g110 +5v ref 2-hi ind 2wd 4 hi 4 lo 4-hi ind 4-lo ind 4wd fuse 15a 4wd indicator lamp 4wd lo sig 4wd sw sig Awd Awd ind Axle ctrl Axle sw sig Battery Body relay block (under c1 Brake control Class ii data Ctrl Data link connector (under left side of dash) Encoder Encoder low Encoder sig Except seo Front axle actuator Front propshaft speed sensor Ft shaft hi Ft shaft lo G200 G203 (behind left side of dash, near left "a" pillar) Gnd Ground Hot at all times Hot in run Hot in run or start Ign e fuse 10a Illumination Instrument panel cluster Interior lights system Left i/p fuse block (lower left side of dash) Left side of dash) Lock sol ctrl Logic Motor ctrl a Motor ctrl b Nca Neutral ind Pnk Rear propshaft speed sensor Red Rr shaft hi Rr shaft lo Seo Seo ign fuse 10a Shift motor Splice pack sp205 (left side of dash) Tan Transfer case encoder motor Transfer case shift control module (left side of i/p area, behind knee bolster, above parking brake assy) Transfer case shift control switch Trec fuse 30a Underhood fuse block (left side of engine compt, near battery) Transfer Case Wiring Diagram, 2-Speed Manual for Chevrolet Silverado 2003 3500 List of elements for Transfer Case Wiring Diagram, 2-Speed Manual for Chevrolet Silverado 2003 3500: 25 (in engine harness) s165 (w/ allison transmission) 4wd fuse 15a 4wd indicator lamp Data link connector (under left side of dash) Dsl(ecm) gas (pcm) E2 c1 Electronic brake control module (on left side of inner frame) Except seo Front axle actuator G110 (on left front body mount) Hot in run Hot in run or start Ign e fuse 10a Instrument panel cluster Left i/p fuse block (lower left side of dash) Logic Pnk Powertrain control module (gas engines) or engine control module (diesel) (left front of engine compt) Seo Seo ign fuse 10a Splice pack sp205 (left side of dash) Transfer case shift switch (left front of transfer case) Transmission control module (w/ allison trans) (left front of engine compt) Underhood fuse block (left side of engine compt, near battery)
4.3L VIN X 4.3L VIN X, A/T Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for 4.3L VIN X, A/T Wiring Diagram for Chevrolet Silverado 2003 3500: 84 (behind left side of dash) g203 (not used) a (right rear of engine block) g103 +5v 1-2 shift solenoid 1-2 ss 2-3 shift solenoid 2-3 ss 3-2 shift solenoid 3-2 ss 4wd circuit (transfer case & front axle switch) 4wd low A/t fluid pressure manual valve position switch Automatic transmission (4l60-e) B10 B11 B12 Body control module (below steering column) Brake fuse 10a Brk sw C12 Cls 2 data D3, d2 D4, d2 Data link connector (below steering column) E11 Ect sig Engine controls system Engine coolant temperature sensor (rear of left cylinder head) Fluid temp sensor Frt axle sw G103 (right rear of engine block) Gnd Hot at all times Hot in run Hot in run & start Hot in run, acc & start I/p relay block (below left side of dash) Ign Ign0 fuse 10a Instrument cluster Instrument panel cluster (ipc) Ipc/dic fuse 10a Left i/p fuse block (lower left side of dash) Lo ref Malfunction indicator lamp Mil ctrl Park/neutral position switch (left side of transmission) Pc sol hi Pc sol lo Pcm 1 fuse 15a Pcm b fuse 20a Pnk Powertrain control module (left front of engine compt) Press ctrl solenoid Prnd a Prnd b Prnd c Prnd p Range b Range c Red Red a Rev, lo S103 S312 Sens gnd Splice pack sp205 (in dash harness) Stoplight switch (top of brake pedal bracket) Tan Tcc pwm Tcc pwm solenoid Tcc sol Tcc solenoid Tft sens sig Throttle position sensor (on throttle body assy) Tow/haul switch Tp sig Trans rng a Underhood fuse block (left side of engine c2 compt, near the battery) Underhood fuse block (left side of engine compt, near battery) Vehicle speed sensor (2wd: left rear of transmission) (4wd: left side of transfer case) Vss hi Vss lo
4.8L VIN V 4.8L VIN V, A/T Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for 4.8L VIN V, A/T Wiring Diagram for Chevrolet Silverado 2003 3500: 85 (behind left side of dash) g203 (left rear of engine compt) throttle actuator control module (not used) (right rear of engine block) g103 1-2 shift solenoid 1-2 ss 2-3 shift solenoid 2-3 ss 3-2 shift solenoid 3-2 ss 4wd circuit (transfer case & front axle switch) 4wd low A/t fluid pressure manual valve position switch Automatic transmission (4l60-e) B10 B11 B12 Body control module (below steering column) Brake fuse 10a Brk sw C12 Cls 2 data D3, d2 D4, d2 Data link connector (below steering column) E11 Ect sig Engine controls system Engine coolant temperature sensor (front of left cylinder head) Except seo Fluid temp sensor Frt axle sw Gnd Hot at all times Hot in run Hot in run & start Hot in run, acc & start I/p relay block (below left side of dash) Ign Ign0 fuse 10a Instrument cluster Instrument panel cluster (ipc) Ipc/dic fuse 10a Left i/p fuse block (lower left side of dash) Lo ref Malfunction indicator lamp Mil ctrl Park/neutral position switch (left side of transmission) Pc sol hi Pc sol lo Pcm 1 fuse 15a Pcm b fuse 20a Pnk Powertrain control module (left front of engine compt) Press ctrl solenoid Prnd a Prnd b Prnd c Prnd p Range b Range c Red Red a Rev, lo S103 S312 Sens gnd Seo Seo b1 fuse 15a Serial data Splice pack sp205 (in dash harness) Stoplight switch (top of brake pedal bracket) Tan Tcc pwm Tcc pwm solenoid Tcc sol Tcc solenoid Tft sens sig Tow/haul switch Trans rng a Underhood fuse block (left side of engine c2 compt, near the battery) Underhood fuse block (left side of engine compt, near battery) Vehicle speed sensor (2wd: left rear of transmission) (4wd: left side of transfer case) Vss hi Vss lo
5.3L VIN T 5.3L VIN T, A/T Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for 5.3L VIN T, A/T Wiring Diagram for Chevrolet Silverado 2003 3500: 85 (behind left side of dash) g203 (left rear of engine compt) throttle actuator control module (not used) (right rear of engine block) g103 1-2 shift solenoid 1-2 ss 2-3 shift solenoid 2-3 ss 3-2 shift solenoid 3-2 ss 4wd circuit (transfer case & front axle switch) 4wd low A/t fluid pressure manual valve position switch Automatic transmission (4l60-e) B10 B11 B12 Body control module (below steering column) Brake fuse 10a Brk sw C12 Cls 2 data D3, d2 D4, d2 Data link connector (below steering column) E11 Ect sig Engine controls system Engine coolant temperature sensor (front of left cylinder head) Except seo Fluid temp sensor Frt axle sw Gnd Hot at all times Hot in run Hot in run & start Hot in run, acc & start I/p relay block (below left side of dash) Ign Ign0 fuse 10a Instrument cluster Instrument panel cluster (ipc) Ipc/dic fuse 10a Left i/p fuse block (lower left side of dash) Lo ref Malfunction indicator lamp Mil ctrl Park/neutral position switch (left side of transmission) Pc sol hi Pc sol lo Pcm 1 fuse 15a Pcm b fuse 20a Pnk Powertrain control module (left front of engine compt) Press ctrl solenoid Prnd a Prnd b Prnd c Prnd p Range b Range c Red Red a Rev, lo S103 S312 Sens gnd Seo Seo b1 fuse 15a Serial data Splice pack sp205 (in dash harness) Stoplight switch (top of brake pedal bracket) Tan Tcc pwm Tcc pwm solenoid Tcc sol Tcc solenoid Tft sens sig Tow/haul switch Trans rng a Underhood fuse block (left side of engine c2 compt, near the battery) Underhood fuse block (left side of engine compt, near battery) Vehicle speed sensor (2wd: left rear of transmission) (4wd: left side of transfer case) Vss hi Vss lo
6.0L VIN U 6.0L VIN U, A/T Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for 6.0L VIN U, A/T Wiring Diagram for Chevrolet Silverado 2003 3500: 85 (behind left side of dash) g203 (left rear of engine compt) throttle actuator control module (not used) (right rear of engine block) g103 1-2 shift solenoid 1-2 ss 2-3 shift solenoid 2-3 ss 3-2 shift solenoid 3-2 ss 4wd circuit (transfer case & front axle switch) 4wd low A/t fluid pressure manual valve position switch Automatic transmission (4l60-e) B10 B11 B12 Body control module (below steering column) Brake fuse 10a Brk sw C12 Cls 2 data D3, d2 D4, d2 Data link connector (below steering column) E11 Ect sig Engine controls system Engine coolant temperature sensor (front of left cylinder head) Except seo Fluid temp sensor Frt axle sw Gnd Hot at all times Hot in run Hot in run & start Hot in run, acc & start I/p relay block (below left side of dash) Ign Ign0 fuse 10a Instrument cluster Instrument panel cluster (ipc) Ipc/dic fuse 10a Left i/p fuse block (lower left side of dash) Lo ref Malfunction indicator lamp Mil ctrl Park/neutral position switch (left side of transmission) Pc sol hi Pc sol lo Pcm 1 fuse 15a Pcm b fuse 20a Pnk Powertrain control module (left front of engine compt) Press ctrl solenoid Prnd a Prnd b Prnd c Prnd p Range b Range c Red Red a Rev, lo S103 S312 Sens gnd Seo Seo b1 fuse 15a Serial data Splice pack sp205 (in dash harness) Stoplight switch (top of brake pedal bracket) Tan Tcc pwm Tcc pwm solenoid Tcc sol Tcc solenoid Tft sens sig Tow/haul switch Trans rng a Underhood fuse block (left side of engine c2 compt, near the battery) Underhood fuse block (left side of engine compt, near battery) Vehicle speed sensor (2wd: left rear of transmission) (4wd: left side of transfer case) Vss hi Vss lo
WARNING SYSTEMS Warning Systems Wiring Diagram (1 of 2) for Chevrolet Silverado 2003 3500 List of elements for Warning Systems Wiring Diagram (1 of 2) for Chevrolet Silverado 2003 3500: 56 (behind left side of dash, near left "a" pillar) g203 (on left "b" pillar) g305 (on right "b" pillar) g306 5v reference A12 Accessory voltage Anl/drl defeat Auto B11 B12 Battery Body control module (bcm) (on lower left side of dash, below steering column) Crew cab only D12 Dimming input Dimming return E11 E12 G203 (behind left side of dash, near left "a" pillar) Ground Ground distribution system Head Headlamp switch Headlamps on signal Hot at all times Hot in acc & run Hot in acc, run & start Hot in run & start I/p relay block (below left side of dash, left of steering column) Ignition 0 voltage Ignition 1 voltage Ignition key alarm switch Key in ignition switch Left front door ajar sw Left i/p fuse block (on lower left side of dash) Left rear door ajar sw Left rear mini wedge (door jamb switch) Park Park brake sw signal Park brake switch (part of park brake assembly) Park lamp on signal Pnk Power distribution system Right front door ajar sw Right rear door ajar sw Right rear mini wedge (door jamb switch) S212 (in i/p harness) Serial data Tbc 2a fuse 15a Tbc 2b fuse 15a Tbc 2c fuse 15a Tbc accy fuse 10a Tbc batt fuse 10a Tbc ign 0 fuse 10a Tbc ign 1 fuse 10a Underhood fuse block (at left side of engine compartment, near battery) Warning Systems Wiring Diagram (2 of 2) for Chevrolet Silverado 2003 3500 List of elements for Warning Systems Wiring Diagram (2 of 2) for Chevrolet Silverado 2003 3500: 33 (behind right side of dash, near right "a" pillar) g200 Computer data lines system Data link connector (dlc) (partial) (under left side of dash, below steering column) Door ajar switch Driver door module (ddm) (behind driver's door trim panel, below switch assembly) Driver mini wedge (door jamb switch) Driver seat belt switch Exterior lights system Front passenger door module (fpdm) (behind front passenger's door trim panel, below switch assembly) Front passenger mini wedge (door jamb switch) Ground distribution system Ign Inflatable restraint sensing & diagnostic module (sdm) (under left front seat) Instrument panel cluster (ipc) Left door ajar sw Left i/p fuse block (on lower left side of dash) Left seat belt Left turn Logic Low reference Pnk Powertrain control module (pcm) (on left front of engine compartment) Radio Right i/p fuse block (on lower right side of dash) Right turn Seat belt Serial data Splice pack sp205 (in i/p harness) Tan W/anti-theft system W/convenience package comfort & decor level 3 W/memory seats W/o convenience package comfort & decor level 3
WIPER/WASHER Front Washer/Wiper Wiring Diagram for Chevrolet Silverado 2003 3500 List of elements for Front Washer/Wiper Wiring Diagram for Chevrolet Silverado 2003 3500: 30 Accessory voltage G100 (on left side of radiator support) G200 (behind right side of dash) G203 (behind left side of dash) Ground Hot at all times Hot in run and acc Left i/p fuse block (lower left side of dash) Lsd Mist Off Pnk Pulse Red S100 S202 S217 Tan Turn signal multi- function switch Underhood fuse block (on left side of engine compt) W/s wash fuse 15a W/s wash relay W/s wiper fuse 25a Wash Windshield washer fluid pump (on washer fluid reservoir) Windshield washer relay cntrl Windshield wiper high signal Windshield wiper motor module (under windshield cowl) Windshield wiper switch signal Windshield wiper/ washer switch
