Diagram sections — 26 (60 total)
AIR CONDITIONING ANTI-LOCK BRAKES ANTI-THEFT BODY CONTROL MODULES COMPUTER DATA LINES CRUISE CONTROL DEFOGGERS ENGINE PERFORMANCE EXTERIOR LIGHTS GROUND DISTRIBUTION HEADLIGHTS HORN INSTRUMENT CLUSTER INTERIOR LIGHTS 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 Compressor Wiring Diagram for Chevrolet Chevy Express G2003 2500 List of elements for Compressor Wiring Diagram for Chevrolet Chevy Express G2003 2500: 29 (4.3l vin x: engine harn, 6 cm from generator connector breakout) (except 4.3l vin x: engine harn, 8 cm from knock sensor breakout) A/c compressor clutch A/c fuse 32 10a A/c high pressure switch (rear of a/c compressor) A/c low pressure switch (on side of accumulator) A/c relay 54 Bi-lev Body fuse block (below left front seat) Clutch rly ctrl D12 Def F12 G102 (on left rear of engine) Heat Heat/def Hot at all times Hot in run Hot in run or start Hvac control assembly Hvac fuse 10 20a Ign e fuse 22 10a Low press sig Max Norm Off Powertrain control module (pcm) (on left front inner fender) Request sig Underhood fuse block (on left side of engine compt) Vent Heater Wiring Diagram for Chevrolet Chevy Express G2003 2500 List of elements for Heater Wiring Diagram for Chevrolet Chevy Express G2003 2500: 44 (bottom of left "b" pillar) g347 (left rear of passenger (rear a/c harn, 7 cm from rear blower motor resistor breakout) (rear hvac harn, 13 cm from auxiliary blower motor connector breakout) (rear hvac harn, 20 cm from auxiliary blower motor connector breakout) Air temperature actuator (behind right side of dash) Auxiliary blower motor (if equipped (left rear of passenger Auxiliary blower motor resistor (if equipped) (left rear of passenger Auxiliary blower motor switch (if equipped) Auxiliary high speed blower motor relay (if equipped) (left rear of passenger Auxiliary low speed blower motor relay (if equipped) Auxiliary medium speed blower motor relay (if equipped) (left rear of passenger Bi-lev Blow fuse 51 40a Blower motor (right rear of engine compt) Blower motor resistor assembly (right rear of engine compt) Body fuse block (below left front seat) Compt, on auxiliary hvac assembly) Def F10 G102 (on left rear of engine) G304 (behind right kick panel) G401 (top of right "d" pillar) Heat Heat/def Hot at all times Hot in run Hvac 1 fuse 9 10a Hvac control assembly Hvac fuse 10a Interior lights system Med Off Rr blower fuse 13 30a S102 (4.3l vin x: engine harn, 6 cm from generator connector breakout) (except 4.3l vin x: engine harn, 8 cm from knock sensor breakout) S249 (dash harn, 5 cm from inflatable restraint dash module connector breakout) S401 (body harn, 16 cm from chmsl connector breakout) S405 S412 S413 Splice pack sp347 Tan Underhood fuse block (left side of engine compt) Vent Manual A/C Wiring Diagram, Cargo Van (1 of 2) for Chevrolet Chevy Express G2003 2500 List of elements for Manual A/C Wiring Diagram, Cargo Van (1 of 2) for Chevrolet Chevy Express G2003 2500: 46 (4.3l vin x: engine harn, 6 cm from generator connector breakout) (except 4.3l vin x: engine harn, 8 cm from knock sensor breakout) (behind right (behind right kick panel) g304 A/c high pressure switch Auxiliary air temperature actuator (left rear of passenger compt) Auxiliary mode actuator (left rear of passenger compt) Battery Bi-lev Blow fuse 51 40a Blower motor (right rear of engine compt) Blower motor resistor assembly (right rear of engine compt) Body fuse block (below left front seat) C2 a C2 c Def Defogger system F10 Front auxiliary hvac control assembly (if equipped) G102 (on left rear of engine) G347 (bottom of left "b" pillar) G401 (top of right "d" pillar) Ground Heat Heat/def Hot at all times Hot in run Hvac 1 fuse 9 10a Hvac control assembly Hvac fuse 10a Ing 3 Interior lights system Logic Max Med Norm Off R defog ind Reading lamp connector breakout) Rr blower fuse 13 30a S102 S249 (dash harn, 5 cm from inflatable restraint dash module connector breakout) S411 (rear hvac harn, 6 cm from auxiliary blower motor connetcor breakout) Side of dash) air temperature actuator Tan Underhood fuse block (left side of engine compt) Vent Manual A/C Wiring Diagram, Cargo Van (2 of 2) for Chevrolet Chevy Express G2003 2500 List of elements for Manual A/C Wiring Diagram, Cargo Van (2 of 2) for Chevrolet Chevy Express G2003 2500: 41 (4.3l vin x: engine harn, 6 cm from generator connector breakout) (except 4.3l vin x: engine harn, 8 cm from knock sensor breakout) (left rear of passenger (on left rear of engine) (provisional) (rear hvac harn, 13 cm from auxiliary blower motor connector breakout) (top of right "d" pillar) g401 (w/ rv upfitter (w/ rv upfitter option: (w/ rv upfitter option: body harn, 22 cm from c308 breakout) (w/o rv upfitter option: body harn, 41 cm from c304 breakout) A/c compressor clutch A/c fuse 32 10a A/c low pressure switch (on side of accumulator) A/c relay 54 Auxiliary blower motor (if equipped) (left rear of passenger Auxiliary blower motor resistor (if equipped) (left rear of passenger Auxiliary high speed blower motor relay (if equipped) (left rear of passenger Auxiliary low speed blower motor relay (if equipped) Auxiliary medium speed blower motor relay (if equipped) (left rear of passenger Body harn, 22 cm from c308 breakout) (w/o rv upfitter option: body harn, 5 cm from c304 breakout) C319 Clutch rly ctrl c2 Compt, on auxiliary hvac assembly) D12 F12 G102 Hot at all times Hot in run or start Ign e fuse 22 10a Low press sig Option: body harn, 32 cm from c308 breakout) (w/o rv upfitter option: body harn, 32 cm from c304 breakout) Powertrain control module (pcm) (on left front inner fender) Request sig S102 S308 S310 S311 S405 S411 (rear hvac harn, 6 cm from auxiliary blower motor connetcor breakout) S412 (rear hvac harn, 20 cm from auxiliary blower motor connector breakout) S413 (rear a/c harn, 7 cm from rear blower motor resistor breakout) Underhood fuse block (left side of engine compt) Manual A/C Wiring Diagram, Passenger Van (1 of 2) for Chevrolet Chevy Express G2003 2500 List of elements for Manual A/C Wiring Diagram, Passenger Van (1 of 2) for Chevrolet Chevy Express G2003 2500: 60 (4.3l vin x: engine harn, 6 cm from generator connector breakout) (except 4.3l vin x: engine harn, 8 cm from knock sensor breakout) (behind right (behind right kick panel) g304 (rear head- liner harn 30 cm from c420) (w/ rv upfitter option: (w/ rv upfitter option: in upfitter hvac control harn, 19 cm from c303 breakout) (w/o rv upfitter option: in front headliner harn, 42 cm from c304 breakout) (w/ rv upfitter option: in upfitter hvac control harn, 64 cm from c303 breakout) (w/o rv upfitter option: in front headliner harn, 11 cm from c304 breakout) (w/ rv upfitter option: in upfitter hvac control harn, 88 cm from c303 breakout) (w/o rv upfitter option: in front headliner harn, 52 cm from c304 breakout) A/c high pressure switch Auxiliary hvac control processor (behind auxiliary hvac assembly, in headliner) Battery Bi-lev Blow fuse 51 40a Blower motor (right rear of engine compt) Blower motor resistor assembly (right rear of engine compt) Body fuse block (below left front seat) Breakout) C1 g C2 a C2 c Def Defogger system Except rv F10 Front auxiliary hvac control assembly G102 (on left rear of engine) G347 (bottom of left "b" pillar) Ground Heat Heat/def Hot at all times Hot in run Hvac 1 fuse 9 10a Hvac control assembly Hvac fuse 10a In upfitter hvac control harn, 39 cm from c303 breakout) (w/o rv upfitter option: in front headliner harn, 31 cm from c304 breakout) Ing 3 Interior lights system Logic Max Med Norm Off R defog ind Rear Rear auxiliary hvac control assembly Rr blower fuse 13 30a S102 S249 (dash harn, 5 cm from inflatable restraint dash module connector breakout) S305 S306 S307 S314 S330 S354 Side of dash) air temperature actuator Tan Tan e Underhood fuse block (left side of engine compt) Vent Manual A/C Wiring Diagram, Passenger Van (2 of 2) for Chevrolet Chevy Express G2003 2500 List of elements for Manual A/C Wiring Diagram, Passenger Van (2 of 2) for Chevrolet Chevy Express G2003 2500: 42 (4.3l vin x: engine harn, 6 cm from generator connector breakout) (except 4.3l vin x: engine harn, 8 cm from knock sensor breakout) (on left rear of engine) (provisional) (rear hvac harn, 13 cm from auxiliary blower motor connector breakout) s405 (w/ rv upfitter (w/ rv upfitter option: (w/ rv upfitter option: body harn, 22 cm from c308 breakout) (w/o rv upfitter option: body harn, 41 cm from c304 breakout) A/c compressor clutch A/c fuse 32 10a A/c low pressure switch (on side of accumulator) A/c relay 54 Auxiliary air temperature actuator (left rear of passenger compt) Auxiliary blower motor (left rear of passenger compt, on auxiliary Auxiliary blower motor resistor (left rear of passenger Auxiliary high speed blower motor relay (left rear of passenger Auxiliary low speed blower motor relay (left rear of passenger Auxiliary medium speed blower motor relay (left rear of passenger Auxiliary mode actuator (left rear of passenger compt) Body harn, 22 cm from c308 breakout) (w/o rv upfitter option: body harn, 5 cm from c304 breakout) C319 Clutch rly ctrl c2 Compt, on auxiliary hvac assembly) D12 F12 G102 G401 (top of right "d" pillar) Hot at all times Hot in run or start Hvac assembly) Ign e fuse 22 10a Low press sig Option: body harn, 32 cm from c308 breakout) (w/o rv upfitter option: body harn, 32 cm from c304 breakout) Powertrain control module (pcm) (on left front inner fender) Request sig S102 S308 S310 S311 S411 (rear hvac harn, 6 cm from auxiliary blower motor connetcor breakout) S412 (rear hvac harn, 20 cm from auxiliary blower motor connector breakout) S413 (rear a/c harn, 7 cm from rear blower motor resistor breakout) Underhood fuse block (left side of engine compt)
ANTI-LOCK BRAKES Anti-lock Brakes Wiring Diagram for Chevrolet Chevy Express G2003 2500 List of elements for Anti-lock Brakes Wiring Diagram for Chevrolet Chevy Express G2003 2500: 54 (heavy duty) (light duty) (light duty) (heavy duty) A10 Abs fuse 10a Abs pump Abs/tcc sw Anti-lock ind B10 Body fuse block (below left front seat) Brake fluid level sw in Brake fluid level switch (heavy duty) (on brake master cylinder reservoir) Brake ind Brake input Brake pessure differential switch (light duty) (on brake valve, near front of ebcm) Brks fuse 10a C1 d4 C12 C7 a Cruise control system Data link connector (dlc) (under left side of dash) Electronic brake control module (ebcm) (on left frame rail, near center of vehicle) G102 (left rear of engine block) G300 (on left frame rail, near ebcm) G400 (left rear of engine block) Hot at all times Hot in run Hot in run or start Ign e fuse 10a Ignition Instrument panel cluster Left front sensor (+) Left front sensor (-) Left front wheel speed sensor Logic Nca Pnk Powertrain control module (pcm) (in eng comp, on left inner fender) Right front sensor (+) Right front sensor (-) Right front wheel speed sensor S402 s102 Serial data Splice pack sp200 (in dash wiring harn, 10 cm from underhood pass-through grommet breakout) Stop lamp switch (behind left side of dash, above brake pedal) Tan Tcc brake sw Uinderhood fuse block (on left side of eng compt) Underhood fuse block (on left side of eng compt) Vehicle speed sensor (vss) (4l80-e: on left side of transmission, 4l60-e: on right side of transmission) Vss high Vss input Vss low Vss output
ANTI-THEFT Anti-theft Wiring Diagram for Chevrolet Chevy Express G2003 2500 List of elements for Anti-theft Wiring Diagram for Chevrolet Chevy Express G2003 2500: 33 12v 12v ref A11 A12 Acc volt B12 B9 serial data c2 Body control module (behind lower right side of dash) Data link connector (under left side of dash) Electronic brake control module (on left frame rail, near center of vehicle) G303 (behind left kick panel) Ground Hot at all times Hot on acc or run Hot on run or start Ign 1 volt Instrument panel cluster Passlk sens Passlock sensor (inside top of steering column) Passlock signal Pnk Powertrain control module (engine compt, on left inner fender) Security indicator Sens ret Sensor return Serial data Serial data c1 Splice pack sp200 (dash harn, 10 cm from underhood pass-through grommet) Tan Tbc acc fuse 46 10a Tbc fuse 19 10a Tbc ign 1 fuse 24 10a Underhood fuse block
BODY CONTROL MODULES Body Control Modules Wiring Diagram (1 of 2) for Chevrolet Chevy Express G2003 2500 List of elements for Body Control Modules Wiring Diagram (1 of 2) for Chevrolet Chevy Express G2003 2500: 58 12 volt ref A10 A11 A12 Access panel relay Accy panel left side front rly ctrl Accy panel left side rly ctrl Accy panel right side rly ctrl Anti-theft system B10 B11 B12 Backlight lamps ctrl Battery + Body control module (behind lower side of dash) Cargo door release rly ctrl Class 2 serial data Commercial vehicle Computer data lines system Dimming input Dimming potentiometer 5volt ref Door locks system Driver door release rly ctrl Drl low ctrl Drl on/off sw sig Exterior lights system G302 (behind left kick panel) G303 (behind left kick panel) Ground Hazard sw sig Headlamp dimmer sw sig 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 Led dimming sig Non-commercial vehicle Park lamp relay ctrl Park lamp sw on sig Passenger door sw unlock rly ctrl Pnk Power tops system S247 S248 Security syst sens low ref Securityn system sens sig Tan Tbc 3 fuse 15a Tbc 4 fuse 15a Tbc fuse 15a Tow/haul switch Traction ctrl sw sig Underhood fuse block Body Control Modules Wiring Diagram (2 of 2) for Chevrolet Chevy Express G2003 2500 List of elements for Body Control Modules Wiring Diagram (2 of 2) for Chevrolet Chevy Express G2003 2500: 37 (non-commercial vehicle w/ side door lock) A11 Accessory volt B11 B12 Battery + Body control module (behind lower side of dash) Courtesy lamp high ctrl Courtesy lamps on sig Dimmer return Door lock ctrl Door locks system Door open sw sig Exterior lights system Headlamp sw flash to pass sig Headlamp sw headlamp on sig Headlights system Hot at all times Hot in acc & run Hot in acc run & start Hot in run & start Ign 0 fuse 10a Ignition 0 volt Ignition 1 volt Interior lights system Key in ignition sw sig Park brake sw sig Park brake switch (under left side of dash) Pnk Recreational vehicle Tan Tbc 2 fuse 15a Tbc acc fuse 10a Tbc ign1 fuse 10a Underhood fuse block W/o recreational vehicle Warnings system
COMPUTER DATA LINES Computer Data Lines Wiring Diagram for Chevrolet Chevy Express G2003 2500 List of elements for Computer Data Lines Wiring Diagram for Chevrolet Chevy Express G2003 2500: 21 Body control module (bcm) (behind lower side of dash) Chime module Cigar fuse 15a Data clss 2 Data link connector (dlc) (under left side of dash) Electronic brake control module (ebcm) (on left frame rail, near center of vehicle) G303 (behind left kick panel) Hot at all times Inflatable restraint sensing & diagnostic module (under left front seat) Instrument panel cluster Pnk Power distribution system Powertrain control module (pcm) (in eng compt, on left inner fender) Radio Remote control door lock receiver (upper left center of dash) S248 Splice pack sp200 (in dash wiring harn, 10 cm from underhod pass- through grommet breakout) Underhood fuse block Vehicle communications interface module (vcim) (below steering column) W/ radio W/o radio
CRUISE CONTROL Cruise Control Wiring Diagram for Chevrolet Chevy Express G2003 2500 List of elements for Cruise Control Wiring Diagram for Chevrolet Chevy Express G2003 2500: 54 17 (or 1320) Auto cruise Body fuse block (below left front seat) C12 Cargo/ passenger Class 2 Class 2 (pcm) Computer data lines system Cruise control module (near brake fluid reservoir) Cruise control on/off switch Cruise ind Cruise on input Cutaway Data E12 Early production Exterior lights system F10 G302 (behind left kick panel) Ground Hot at all times Hot in run & start Ign Ign e fuse 22 10a Ignition Inhibit sig Instrument Late production Nca Off Panel cluster Pcm ign 1 fuse 38 10a Pnk Powertrain control module (pcm) (in engine compt, on left inner fender) Resume/ accel Resume/accel Resume/accel sig S231 S247 Serial data Set/ coast Set/coast sig Speed sensor input Speed signal Stop lp fuse 7 15a Stop/ chmsl fuse 8 10a Stoplamp sw input Stoplamp switch (above brake pedal) Turn signal multifunction switch Underhood fuse block (left side of engine compt) Vcm signal Vehicle speed sensor (vss) (on right side of transmission) Vss high Vss low
DEFOGGERS Defoggers Wiring Diagram for Chevrolet Chevy Express G2003 2500 List of elements for Defoggers Wiring Diagram for Chevrolet Chevy Express G2003 2500: 24 B12 c1 Body fuse block (on left lower kick panel) Driver outside rear- view mirror Driver outside rearview mirror G302 (behind left kick panel) G304 (behind right kick panel) G347 (bottom of left "b" pilar) G401 (on top of right "d" pilar) G402 (on top of left "d" pilar) Ground Hot at all times Hot in run Htd mir defog fuse 12 30a Hvac 1 fuse 9 10a Hvac control assembly Ign 3 voltage Left rear window defog grid Logic Nca R. def indicator Rear window defog switch (de-energize after time delay) Right rear window defog grid Rr def/ htd mir fuse 8 20a Splice pack sp347
ENGINE PERFORMANCE
4.3L VIN X 4.3L VIN X, Engine Performance Wiring Diagram (1 of 5) for Chevrolet Chevy Express G2003 2500 List of elements for 4.3L VIN X, Engine Performance Wiring Diagram (1 of 5) for Chevrolet Chevy Express G2003 2500: 52 (lower front of engine near crankshaft) crankshaft position (ckp) sensor (under left side of dash) data link connector +5v 12 ref 3-2 ss ctrl A10 Body control module (behind lower right side of dash) Brk sw sig C10 Central sequential fuel injection (bottom of intake manifold) Ckp 1 sig Cls 2 data Cmp sig D10 E10 Ect sig Eng 1 fuse 23 15a Eng 2 fuse 21 15a 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 6 10a Inj 1 ctrl Inj 2 ctrl Inj 3 ctrl Inj 4 ctrl Inj 5 ctrl Inj 6 ctrl Ks 1 signal O2a fuse 15a O2b fuse 15a Oil lev sw sig Pcm batt fuse 2 20a Pnk Powertrain control module (in engine compt, on left inner fender) Prnd a sig Prnd b sig Prnd p sig Range b Range c Ref low Rly ctrl S101 Sp200 (in dash wiring harn, 10cm from unerhood pass- through grommet breakout Starting/ charging system Tan Under- hood fuse block 4.3L VIN X, Engine Performance Wiring Diagram (2 of 5) for Chevrolet Chevy Express G2003 2500 List of elements for 4.3L VIN X, Engine Performance Wiring Diagram (2 of 5) for Chevrolet Chevy Express G2003 2500: 26 (in chassis harn, 37cm from ebcm connector breakout) s301 (not used) All others Cargo/ passenger Engine coolant temperature sensor (on left side of engine) Engine oil level switch (right side of oil pan) Fuel pump & sender assembly (in fuel tank) Fuel pump fuse 12 20a Fuel pump relay G102 (left rear of engine) G103 (right rear of engine) G400 (on inner left rear frame rail) Heated oxygen sensor (bank 1 sensor 1) (in exh pipe, front of cat converter) Heated oxygen sensor (bank 1 sensor 2) (in exh pipe, rear of cat converter) Heated oxygen sensor (bank 2 sensor 1) (in exh pipe, front of cat converter) Heated oxygen sensor (bank 2 sensor 2) (in exh pipe, rear of cat converter) Hot at all times Knock sensor (on top left rear of (engine) Nca Park/neutral position switch (left side of transmission) Pnk S101 S102 Tan Throttle position sensor (on left side of throttle body) Under- hood fuse block 4.3L VIN X, Engine Performance Wiring Diagram (3 of 5) for Chevrolet Chevy Express G2003 2500 List of elements for 4.3L VIN X, Engine Performance Wiring Diagram (3 of 5) for Chevrolet Chevy Express G2003 2500: 27 1-2 sol 2-3 sol 3-2 sol A red A/t fluid pressure manual valve position switch Automatic transaxle C12 Camshaft position sensor (part of distributor, top rear of engine) Engine oil pressure (eop) sensor (top rear of engine) Evaporative emission (evap) canister purge solenoid (on top of engine, near throttle body) Fuel tank pressure sensor (in fuel tank) Hot in run & start Ign e fuse 22 10a M tan Manifold absolute pressure sensor (on top right side of engine) N pnk Pc sol valve Pnk Pnk a Red Rev Stop- lamp switch (above brake pedal) Tan Tcc pwm sol Tcc sol Tft sensor Underhood fuse block 4.3L VIN X, Engine Performance Wiring Diagram (4 of 5) for Chevrolet Chevy Express G2003 2500 List of elements for 4.3L VIN X, Engine Performance Wiring Diagram (4 of 5) for Chevrolet Chevy Express G2003 2500: 15 Can vent fuse 34 10a Evaporative emissions canister vent solenoid (on evap cannister, near front of fuel tank) G103 (right rear of engine) Gnd Hot at all times Iat sensor Ign Intake air temperature (iat)/ mass airflow (maf) sensor (integral with mass airflow sensor) Pnk Pnk tan S101 Signal Tan Underhood fuse block Vehicle speed sensor (on right side of transmission) 4.3L VIN X, Engine Performance Wiring Diagram (5 of 5) for Chevrolet Chevy Express G2003 2500 List of elements for 4.3L VIN X, Engine Performance Wiring Diagram (5 of 5) for Chevrolet Chevy Express G2003 2500: 70 1-2 ss ctrl 12 ref 2-3 ss ctrl A/c low press A/c request A/c system (c60) Anti-lock brakes system B10 Clu rly ctrl Cntrl Crank fuse 27 10a Crank volt Cruise control system Cruise engaged Cruise inhibit Distributor Eng 1 fuse 23 15a Evap canp ctrl Evap vent ctrl Front high sig Front low sig Fuel lev sig Fuel press sig G102 (left rear of engine) G103 (right rear of engine) Gen cycle sig Gen ind Gnd Ho2s htr low Ho2s low ctrl Hot in run & start Hot in start Iac coil a hi Iac coil a low Iac coil b hi Iac coil b low Iat sig Ic timing cntrl Idle air control valve (on left side of throttle body) Ign 1 Ign coil Ignition coil Ignition control module Instrument panel cluster Logic Maf sig Malfunction indicator lamp Map sig Mil ctrl Nca Pc sol hi ctrl Pc sol lo ctrl Pcm ign 1 fuse 38 15a Pmp rly ctrl Pnk Pnk a Powertrain control module (in engine compt, on left inner fender) Press sens sig Prnd c sig Ref low S101 Starting/ charging system Starting/charging system Tan Tcc pwm ctrl Tcc sol ctrl Tft sens sig Tp sens sig Underhood fuse block Vss
5.3L VIN T 5.3L VIN T, Engine Performance Wiring Diagram (1 of 5) for Chevrolet Chevy Express G2003 2500 List of elements for 5.3L VIN T, Engine Performance Wiring Diagram (1 of 5) for Chevrolet Chevy Express G2003 2500: 60 (lower right rear of engine) crankshaft position (ckp) sensor (under left side of dash) data link connector +5v +5v (6.0l) 12 ref 3-2 ss ctrl A10 Body control module (behind lower right side of dash) Brk sw sig C10 Ckp 1 sig Cls 2 data Cmp sig D10 E10 Ect sig Egr (6.0l) Eng 1 fuse 23 15a Eng 2 fuse 21 15a 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 6 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 Injectors Ks 1 signal Ks 2 signal Low ref O2a fuse 15a O2b fuse 15a Oil lev sw sig Pcm batt fuse 2 20a Pnk Pnk a Powertrain control module (in engine compt, on left inner fender) Prnd a sig Prnd b sig Prnd p sig Range b Range c Ref low Rly ctrl S101 Sp200 (in dash wiring harn, 10cm from unerhood pass- through grommet breakout) Starting/ charging system Tan Tan b Under- hood fuse block 5.3L VIN T, Engine Performance Wiring Diagram (2 of 5) for Chevrolet Chevy Express G2003 2500 List of elements for 5.3L VIN T, Engine Performance Wiring Diagram (2 of 5) for Chevrolet Chevy Express G2003 2500: 28 (in chassis harn, 37cm from ebcm connector breakout) s301 (not used) All others Cargo/ passenger Engine coolant temperature sensor (on left side of engine) Engine oil level switch (right side of oil pan) Fuel pump & sender assembly (in fuel tank) Fuel pump fuse 12 20a Fuel pump relay G102 (left rear of engine) G103 (right rear of engine) G400 (on inner left rear frame rail) Heated oxygen sensor (bank 1 sensor 1) (in exh pipe, front of cat converter) Heated oxygen sensor (bank 1 sensor 2) (in exh pipe, rear of cat converter) Heated oxygen sensor (bank 2 sensor 1) (in exh pipe, front of cat converter) Heated oxygen sensor (bank 2 sensor 2) (in exh pipe, rear of cat converter) Hot at all times Knock sensor 1 (below front of intake manifold) Knock sensor 2 (below rear of intake manifold) Nca Park/neutral position switch (left side of transmission) Pnk S101 S102 S410 (ne7) (in chassis harn, between underhood fuse block & fuel pump sender assembly) Tan Throttle position sensor (on left side of throttle body) Under- hood fuse block 5.3L VIN T, Engine Performance Wiring Diagram (3 of 5) for Chevrolet Chevy Express G2003 2500 List of elements for 5.3L VIN T, Engine Performance Wiring Diagram (3 of 5) for Chevrolet Chevy Express G2003 2500: 30 (4l60e) (4l60e) s 1-2 sol 2-3 sol 3-2 sol A red A/t fluid pressure manual valve position switch Automatic transaxle C12 Camshaft position sensor (top rear of engine) Engine oil pressure (eop) sensor (top rear of engine) Evaporative emission (evap) canister purge solenoid (on top of engine, near throttle body) Exhaust gas recirculation valve (6.0l) (on right front of engine) Fuel tank pressure sensor (in fuel tank) Hot in run & start Ign e fuse 22 10a M tan Manifold absolute pressure sensor (top rear of engine) N pnk Pc sol valve Pnk Pnk a Red Rev Stop- lamp switch (above brake pedal) Tan Tcc pwm sol Tcc sol Tft sensor Underhood fuse block 5.3L VIN T, Engine Performance Wiring Diagram (4 of 5) for Chevrolet Chevy Express G2003 2500 List of elements for 5.3L VIN T, Engine Performance Wiring Diagram (4 of 5) for Chevrolet Chevy Express G2003 2500: 17 (on left side of transmission) (4l80e) automatic transmission input shaft speed sensor Can vent fuse 34 10a Evaporative emissions canister vent solenoid (on evap cannister, near front of fuel tank) G103 (right rear of engine) Gnd Hot at all times Iat sensor Ign Intake air temperature (iat)/ mass airflow (maf) sensor (integral with mass airflow sensor) Pnk Pnk tan S101 Signal Tan Underhood fuse block Vehicle speed sensor (4l60-e) (on right side of transmission) Vehicle speed sensor (4l80-e) (on left side of transmission) 5.3L VIN T, Engine Performance Wiring Diagram (5 of 5) for Chevrolet Chevy Express G2003 2500 List of elements for 5.3L VIN T, Engine Performance Wiring Diagram (5 of 5) for Chevrolet Chevy Express G2003 2500: 89 (in even ignition/coil module jumper harn, on top right side of engine) (in odd ignition/coil module jumper harn, on top left side of engine) (left rear of engine) g102 1-2 ss ctrl 2-3 ss ctrl A/c low press A/c request A/c system (c60) Anti-lock brakes system At iss high sig At iss low sig B10 Clu rly ctrl Crank fuse 27 10a Crank volt Cruise control system Cruise engaged Cruise inhibit Ctrl Egr ctrl (6.0l) Egr hi ctrl Eng 1 fuse 23 15a Evap canp ctrl Evap vent ctrl Front high sig Front low sig Fuel lev sig Fuel press sig G103 (right rear of engine) Gen cycle sig Gen ind Gnd Ho2s htr low Ho2s low ctrl Hot in run & start Hot in start Iac coil a hi Iac coil a low Iac coil b hi Iac coil b low Iat sig Ic 1 ctrl Ic 2 ctrl Ic 3 ctrl Ic 4 ctrl Ic 5 ctrl Ic 6 ctrl Ic 7 ctrl Ic 8 ctrl Idle air control valve (on left side of throttle body) Ign Ign feed Ignition coils Instrument panel cluster Logic Maf sig Malfunction indicator lamp Map sig Mil ctrl Nca Nca nca Pc sol hi ctrl Pc sol lo ctrl Pcm ign 1 fuse 38 15a Pmp rly ctrl Pnk Pnk d Powertrain control module (in engine compt, on left inner fender) Press sens sig Prnd c sig Red c Ref lo Ref low S101 S183 S184 S185 S187 S188 Spark plug Starting/ charging system Starting/charging system Tan Tcc pwm ctrl Tcc sol ctrl Tft sens sig Tp sens sig Underhood fuse block Vss
EXTERIOR LIGHTS Back-up Lamps Wiring Diagram for Chevrolet Chevy Express G2003 2500 List of elements for Back-up Lamps Wiring Diagram for Chevrolet Chevy Express G2003 2500: 16 Backup lamp Body control module (behind lower right side of dash) C5 d F c5 G401 (on top of right "d" pillar) G402 (on top of left "d" pillar) Hot at all times Left tail lamp assembly Nca Power miirror system Right tail lamp assembly S401 S403 S404 (in body harness, left rear side of passenger compartment) Tbc 2 fuse 18 15a Underhood fuse block (left side of engine compartment) Exterior Lamps Wiring Diagram, Cutaway Chassis (1 of 2) for Chevrolet Chevy Express G2003 2500 List of elements for Exterior Lamps Wiring Diagram, Cutaway Chassis (1 of 2) for Chevrolet Chevy Express G2003 2500: 65 (in dash harness, near radio & hvac control assembly breakout) s245 (in dash harness, near radio & hvac control assembly breakout) s246 Battery pos volt Body control module (behind lower right side of dash) Body fuse block (below left front seat) C1 a1 C1 e4 C1 e6 C1 f2 C2 a3 C2 b2 C2 c1 C2 c2 Dr trn mir fuse 14 10a Driver's outside rear view mirror (left turn signal) (w/ de7) Drl low control Drl low ctrl Drl on/off sig Fr prk fuse 22 10a G302 (behind left kick panel) G347 (on bottom of left "b" pillar) Ground Hazard sw sig Hazard switch Head Headlamp and panel dimmer switch Hot at all times Instrument panel cluster Left Left turn signal ind Logic Lp pkr fuse 18 10a Lt drl/turn feed Lt ft turn sig feed Lt rr stop/turn feed Lt turn sig sw sig Nca Not used Off Park Park lamp relay Park lamp rly ctrl Park lamp sw on sig Pass trn mir fuse 19 10a Passenger's outside rear view mirror (right turn signal) (w/ de7) Pnk Provisional Right Right turn signal ind Rt drl/turn feed Rt ft turn sig feed Rt rr stop/turn feed Rt turn sig sw sig S247 S264 S500 S600 Splice pack sp347 Stop lamp sw sig Trlr prk fuse 21 15a Turn signal switch Turn signal/ multifunction switch Turn signal/hazard flasher module (behind left side of dash) Upftr prk fuse 16 10a W/ de7 Exterior Lamps Wiring Diagram, Cutaway Chassis (2 of 2) for Chevrolet Chevy Express G2003 2500 List of elements for Exterior Lamps Wiring Diagram, Cutaway Chassis (2 of 2) for Chevrolet Chevy Express G2003 2500: 57 B11 Battery positive voltage Btsi/ bu fuse 38 15a C1 f11 C2 b6 C2 b7 C2 c1 C2 f10 C3 c1 C3 c6 C3 d1 C3 d2 C4 h C4 p C405 C405 b C405 f C8 a Cruise control system E11 E12 F11 Flasher fuse 14 15a G100 (left front of engine compartment) G101 (right front of engine compartment) G302 (behind left kick panel) G400 (on inner left frame rail) G400 (on inner left rear frame rail) Ground Hot at all times Hot in run or start Ign e fuse 22 10a Left front marker lamp Left front park/ turn signal lamp Lh drl/ turn fuse 10 10a Lr stop/ turn fuse 3 10a Nca Not used Ohms Park/neutral position switch (left side of transmission) Pnk Resistor Rh drl/ turn fuse 9 10a Right front marker lamp Right front park/ turn signal lamp Rr stop/ turn fuse 4 10a S110 S118 S231 (in i/p harness, left side of dash) S247 S402 Stop lamp switch (above brake pedal) Stop lp fuse 7 15a Trlr bu fuse 5 10a Trlr fuse 13 30a Trlr fuse 50 30a Underhood fuse block (left side of engine compartment) Exterior Lamps Wiring Diagram, Except Cutaway (1 of 2) for Chevrolet Chevy Express G2003 2500 List of elements for Exterior Lamps Wiring Diagram, Except Cutaway (1 of 2) for Chevrolet Chevy Express G2003 2500: 80 (in dash harness, near radio & hvac control assembly breakout) s245 (in dash harness, near radio & hvac control assembly breakout) s246 Battery pos volt Body control module (behind lower right side of dash) Body fuse block (below left front seat) C1 a1 C1 b8 C1 d2 C1 e6 C1 f2 C2 a3 C2 b2 C2 c1 C2 c2 Center high mounted stop lamp Cruise control system Dr trn mir fuse 14 10a Driver's outside rear view mirror (left turn signal) (w/ de7) Drl low control Drl low ctrl Drl on/off sig Fr prk fuse 22 10a G302 (behind left kick panel) G347 (on bottom of left "b" pillar) G401 (on top of right "d" pillar) G402 (on top of left "d" pillar) Ground Hazard sw sig Hazard switch Head Headlamp and panel dimmer switch Hot at all times Instrument panel cluster Left Left tail lamp assembly Left turn signal ind License lamp Logic Lp pkr fuse 18 10a Lr stop/ turn fuse 4 10a Lt drl/turn feed Lt ft turn sig feed Lt rr stop/turn feed Lt turn sig sw sig Nca Not used Off Park Park lamp relay Park lamp rly ctrl Park lamp sw on sig Pass trn mir fuse 19 10a Passenger's outside rear view mirror (right turn signal) (w/ de7) Pnk Provisional Right Right tail lamp assembly Right turn signal ind Rr stop/ turn fuse 6 10a Rt drl/turn feed Rt ft turn sig feed Rt rr stop/turn feed Rt turn sig sw sig S247 S264 S401 S403 S500 S600 S902 Splice pack sp347 Stop lamp sw sig Stop/ chmsl fuse 8 10a Tail/ stop/ turn signal lamp Trlr prk fuse 21 15a Turn signal switch Turn signal/ multifunction switch Turn signal/hazard flasher module (behind left side of dash) Upftr prk fuse 16 10a W/ de7 Exterior Lamps Wiring Diagram, Except Cutaway (2 of 2) for Chevrolet Chevy Express G2003 2500 List of elements for Exterior Lamps Wiring Diagram, Except Cutaway (2 of 2) for Chevrolet Chevy Express G2003 2500: 49 Battery positive voltage Btsi/ bu fuse 38 15a C1 f11 C2 b6 C2 b7 C2 c1 C2 d8 C2 e1 C2 f10 C2 f9 C3 c1 C3 d1 C4 p C8 a E12 Flasher fuse 14 15a G100 (left front of engine compartment) G101 (right front of engine compartment) G302 (behind left kick panel) G400 (on inner left frame rail) G400 (on inner left rear frame rail) Ground Hot at all times Hot in run or start Ign e fuse 22 10a Left front marker lamp Left front park/ turn signal lamp Left trailer stop/ turn relay (on left outer frame rail, near center of vehicle Lh drl/ turn fuse 10 10a Lr stop/ turn fuse 3 10a Park/neutral position switch (left side of transmission) Pnk Rh drl/ turn fuse 9 10a Right front marker lamp Right front park/ turn signal lamp Right trailer stop/ turn relay (on left outer frame rail, near center of vehicle Rr stop/ turn fuse 4 10a S110 S118 S247 S402 Stop lamp switch (above brake pedal) Stop lp fuse 7 15a Trl stop/ turn fuse 17 15a Trlr bu fuse 5 10a Trlr fuse 13 30a Trlr fuse 50 30a Underhood fuse block (left side of engine compartment) W/ uy7
GROUND DISTRIBUTION Ground Distribution Wiring Diagram (1 of 4) for Chevrolet Chevy Express G2003 2500 List of elements for Ground Distribution Wiring Diagram (1 of 4) for Chevrolet Chevy Express G2003 2500: 52 (4.3l) (4.3l) ignition control module (icm) (4.8l/5.3l/6.0l) (forward lamp harness, approx 12 cm from left headlamp connector breakout) (in engine harness, approx 4 cm from knock sensor breakout) A/c compressor clutch A/c low pressure switch Battery Blower motor resistor assembly Brake fluid level switch Electronic brake control module (ebcm) Engine oil level switch Fuel pump relay G100 (left front of engine compt) G101 (right front of engine compt) G102 (on left rear of engine) G103 (on right rear of engine) G104 (on lower right front of engine) G105 (on right front frame rail, in engine compt) G106 (on right front of engine compt) G300 (on left frame rail, near ebcm) G301 (behind left kick panel) Horn assembly Ignition coil 1 Ignition coil 2 Ignition coil 3 Ignition coil 4 Ignition coil 5 Ignition coil 6 Ignition coil 7 Ignition coil 8 Inflatable restraint i/p module disable switch Inflatable restraint sensing & diagnostic module (sdm) Intake air temperature (iat)/ mass air flow (maf) sensor Left front marker lamp Left front park/turn signal lamp Left headlamp (w/ sealed beam headlamps) Left high beam headlamp (w/ composite headlamps) Left low beam headlamp (w/ composite headlamps) Nca On top right side of engine) Park/ neutral position (pnp) switch Powertrain control module (pcm) Right front marker lamp Right front park/turn signal lamp Right headlamp (w/ sealed beam headlamps) Right high beam headlamp (w/ composite headlamps) Right low beam headlamp (w/ composite headlamps) S101 s101 (in engine harness, approx 43 cm from underhood lamp breakout) S118 (forward lamp harness, approx 13 cm from right headlamp connector breakout) Underhood fuse block Underhood lamp Ground Distribution Wiring Diagram (2 of 4) for Chevrolet Chevy Express G2003 2500 List of elements for Ground Distribution Wiring Diagram (2 of 4) for Chevrolet Chevy Express G2003 2500: 47 (if equipped) cruise control module (if equipped) power brake booster fluid flow alarm switch (if equipped) rear seat audio control (if equipped) remote control door lock receiver (in dash harness, approx 5 cm from inflatable restraint dash module connector breakout) (in dash harness, approx 8 cm from c200 breakout) (rv/upfitter) provisional A/t shift lock control solenoid A12 Air temperature actuator Auxiliary power outlet Auxiliary relay 24 Body control module (bcm) Body fuse block C200 breakout) C222 Cargo unlk relay 27 Cigar lighter Ctsy lp relay 26 Data link connector (dlc) Door lks relay 30 Drv unlk relay 28 G302 (behind left kick panel) G303 (behind left kick panel) G304 (behind right kick panel) Hazard switch Headlamp & panel dimmer switch Headlamp dimmer switch Hvac control assembly Ignition key alarm switch Inside rearview mirror Instrument panel cluster Pass unlk relay 31 Radio Rr defog relay 25 S264 (in steering column harness, approx 29 cm from c200) Tan Tow/haul switch Turn signal/ hazard flasher module Turn signal/ multifunction switch Vehicle communication interface module (vcim) W/ global positioning system (gps) W/ heated outside mirrors & rear defogger Windshield washer fluid pump Windshield wiper motor Windshield wiper/washer switch Wnd rap relay 23 Ground Distribution Wiring Diagram (3 of 4) for Chevrolet Chevy Express G2003 2500 List of elements for Ground Distribution Wiring Diagram (3 of 4) for Chevrolet Chevy Express G2003 2500: 53 (auxiliary hvac) (if equipped) auxiliary blower motor switch (if equipped) auxiliary hvac control processor (if equipped) driver door lock switch (if equipped) driver window switch (if equipped) front passenger door lock switch (if equipped) front passenger seat adjuster switch (if equipped) front passenger window switch (if equipped) left rear door ajar switch (if equipped) left vanity mirror lamp (if equipped) rear auxiliary hvac control assembly (rv/ upfitter) (rv/upfitter) provisional p C320 C321 C409 Cargo/ cutaway Courtesy/ reading lamp (mid) Courtesy/ reading lamp (rear) Driver mini wedge (door jamb switch) Driver outside rearview mirror Driver seat adjuster switch Except rv/upfitter From splice pack sp347 a (diagram 3 of 4) From splice pack sp347 b (diagram 3 of 4) Front auxiliary hvac control assembly Front courtesy/ reading lamp Front passenger mini wedge (door jamb switch) G347 (on bottom of left "b" pillar) If equipped Left front seat belt switch Left vanity mirror lamp Nca Outside rearview mirror switch Passenger Passenger outside rearview mirror Provisional b Provisional c Right rear door ajar switch Right vanity mirror lamp Rv/upfitter S204 (in vanity mirror lamp harness, approx 13 cm from c203) S304 (in driver seat harness, approx 11 cm from driver seat adjuster switch connector breakout) S500 (in left front door harness, approx 6 cm from left front door door speaker breakout) S600 (in right front door harness, approx 7 cm from right front door speaker breakout) Splice pack sp347 To splice pack sp347 (diagram 3 of 4) W/ electronic side door lock control W/ outside heated mirrors W/ power seat adjuster W/o electronic side door lock control W/o power seat adjuster W/o rear auxiliary controls Ground Distribution Wiring Diagram (4 of 4) for Chevrolet Chevy Express G2003 2500 List of elements for Ground Distribution Wiring Diagram (4 of 4) for Chevrolet Chevy Express G2003 2500: 65 (commercial/tradesman package) (if equipped) cruise control module (if equipped) left rear window defogger grid (if equipped) left trailer stop/turn relay (if equipped) mini wedge (cargo door jamb switch) (if equipped) rear cargo door lock switch (if equipped) right rear window defogger grid (if equipped) right trailer stop/turn relay (in body harness, approx 10 cm from chmsl connector breakout) (in body harness, approx 16 cm from chmsl connector breakout) (w/ rv-upfitter option) (w/o rv-upfitter option) 55 gallon fuel tank Auxiliary air temperature actuator Auxiliary blower motor Auxiliary heater Auxiliary mode actuator B11 Brake pressure differential switch C405 Center high mounted stop lamp (chmsl) Cutaway Dome fluorescent work lamp 1 Dome fluorescent work lamp 2 Except 55 gallon fuel tank Except rv/ upfitter Fluorescent work lamp connector) Fuel pump & sender assembly G400 (on inner left rear frame rail) G401 (on top of right "d" pillar) G402 (on top of left "d" pillar) G403 (on center of left "d" pillar) Heavy duty Left backup lamp Left front dome fluorescent work lamp Left front side front access panel actuator Left front side rear access panel actuator Left rear dome fluorescent work lamp Left rear side front access panel actuator Left rear side rear access panel actuator Left tail/stop & turn signal lamp Left taillamp assembly License lamp Light duty Nca Nca nca Passenger/ cargo Rear dome lamp Rear hvac system Resistor Right backup lamp Right dome fluorescent work lamp Right side front access panel actuator Right side rear access panel actuator Right tail/stop & turn signal lamp Right taillamp assembly S231 S300 (in prp/uf2 harness, approx 42 cm from left front side front access panel actuator) S403 s403 (in body harness, approx 6 cm from g401 breakout) S411 (in rear hvac harness, approx 6 cm from auxiliary blower motor connector breakout) S902 (in right rear door harness, approx 19 cm from license lamp connector breakout) Stop lamp switch Trailer wiring harness Turn/ hazard flasher module Underhood fuse block
HEADLIGHTS Headlights Wiring Diagram for Chevrolet Chevy Express G2003 2500 List of elements for Headlights Wiring Diagram for Chevrolet Chevy Express G2003 2500: 39 A12 B/c Body control module (behind lower right side of dash) Composite Dimmer switch signal Flash to pass signal Ftp Fuse link b G100 (left front of engine compt) G101 (right front of engine compt) G302 (behind left kick panel) Hdlp- hibm relay Hdlp- lobm relay Head Headlamp & panel dimmer switch Headlamp dimmer switch Headlamp on signal High beam relay control Hot at all times Left headlamp Left high beam headlamp Left low beam headlamp Lh- hibm fuse 44 10a Lh- hibm fuse 45 10a Lh- lobm fuse 43 10a Low beam relay control Off Park Red Rh- lobm fuse 42 10a Right headlamp Right high beam headlamp Right low beam headlamp S110 S118 S247 Sealed Turn signal/ malfunction switch Underhood fuse block (on left side of engine compt)
HORN Horn Wiring Diagram for Chevrolet Chevy Express G2003 2500 List of elements for Horn Wiring Diagram for Chevrolet Chevy Express G2003 2500: 18 Body control module (behind lower right side of dash) C 1995 vftc C1 f4 C2 b9 C2 c3 G c1 G102 (on left rear of engine) Horn assembly (in engine compart, near pcm) Horn brush Horn fuse 15 15a Horn relay Horn relay control Horn switch Hot at all times Nca Tan Turn signal/ multifunction switch Underhood fuse block (on left side of engine compartment)
INSTRUMENT CLUSTER Instrument Cluster Wiring Diagram for Chevrolet Chevy Express G2003 2500 List of elements for Instrument Cluster Wiring Diagram for Chevrolet Chevy Express G2003 2500: 66 000000 trip A10 A11 Abs ind Abs system Air bag ind B10 B11 Backlights lamps ctrl Batt voltage Battery ind Body control module (bcm) (lower right side of dash) Brake ind Brake warning ind control Check gages ind Class 2 (bcm) Class 2 (ebcm) Class 2 (pcm) Class 2 (sdm) Class 2 serial data Computer data lines system Cruise ind Drl ind E10 E12 Exterior lights system Fuel gauge G302 (behind left kick panel) G303 (behind left kick panel) Ground High beam ind Hot at all times Hot in run or start Ign Ign e fuse 22 10a Ign voltage Illumination (6 bulbs) Instrument panel cluster Ipc fuse 31 10a Lcd display Left turn ind Lh frt turn sig sup volt Low fuel ind Malfunction ind lamp Mil ctrl Mil signal Oil pressure gauge Oil pressure ind P r n d 3 2 1 Pnk Powertrain control module (in engine compt, attached to left front fender) Rh frt turn sig sup volt Right turn ind S247 S248 Seat belt ind Security ind Serial data Speedometer Tachometer Tow/haul ind Trip reset switch Trip reset swn signal Underhood fuse block (in engine compt, attached to left front fender) Volt sig Voltmeter
INTERIOR LIGHTS Courtesy Lamps Wiring Diagram, with Upfitter Package for Chevrolet Chevy Express G2003 2500 List of elements for Courtesy Lamps Wiring Diagram, with Upfitter Package for Chevrolet Chevy Express G2003 2500: 68 (2004) (in vanity mirror lamp harness, lf passenger compt, approx 42cm (15.5in) from left vanity mirror breakout) s331 (on left front fender) underhood fuse block A10 A11 Auxiliary 1 fuse 32 50a Battery Body control module (bcm) (lower right side of i/p) Body fuse block (below drivers seat) Cargo door latch assembly Ctsy Ctsy lamps on sig Ctsy lp relay 26 Ctsy lp/ seo fuse 3 15a D c4 D1 c2 D11 c2 Defeat sw sig Dome Dome defeat Dome flour- escent fuse 2 10a Dome fluorescent work lamp 1 Dome fluorescent work lamp 2 Dome fluorescent work lamp relay (2004) (attached to left "b" pillar) Door open sw sig Driver door latch assembly E5 c3 Fl dome lp sig Fl dome relay ctrl G102 (left rear of engine) G302 (left front of passenger compartment, behind kick panel) G302 (lf of pass compt behind kick panel) G347 (left side of passenger compartment on lower "b" pillar) G402 (left rear of passenger compt, on center "d" pillar) G403 (left rear of passenger compt, on center "d" pillar) Headlamp and panel dimmer switch Hndl Hot at all times Left front dome fluorescent work lamp Left rear dome fluorescent work lamp Left rear door jamb switch Left vanity mirror lamp Not used Passenger door latch assembly Power Provisional Rear door ajar Rear door sw sig Rear fuse block (attached to left "b" pillar) Red Right dome fluorescent work lamp Right rear door jamb switch Right vanity mirror lamp S102 S204 S247 S300 S348 S350 S500 S600 S902 Splice pack sp347 (in body wiring harness, left side of passenger compt approx 19cm (7.5in) from c308 breakout) Tan Tbc 2 fuse 18 15a Underhood lamp W/ power door locks W/o power door locks Courtesy Lamps Wiring Diagram, without Upfitter Package (1 of 2) for Chevrolet Chevy Express G2003 2500 List of elements for Courtesy Lamps Wiring Diagram, without Upfitter Package (1 of 2) for Chevrolet Chevy Express G2003 2500: 46 (2004) A10 A11 Auxiliary 1 fuse 32 50a Battery Body control module (bcm) (lower right side of i/p) Body fuse block (below drivers seat) Cargo Cargo door latch assembly Ctsy Ctsy lamps on sig D11 Defeat sw sig Dome Dome defeat Door open sw sig Driver door latch assembly Fl work lmp ctrl Fl work lmp sig G302 (left front of passenger compt, behind kick panel) G347 (left side of passenger compartment on lower "b" pillar) G401 (rr of passenger compt, on upper "d" pillar) G402 (left rear of passenger compt, on center "d" pillar) Headlamp and panel dimmer switch Hndl Hot at all times Left rear door jamb switch Lf door sw sig Not used Passenger door latch assembly Power Rear dome lamp Rear door ajar Red Right rear door jamb switch S247 S401 S500 S600 S902 Splice pack sp347 (in body wiring harness, left side of passenger compt approx 19cm (7.5in) from c308 breakout) Tan Tbc 2 fuse 18 15a Underhood fuse block (on left front fender) W/ power door locks W/o power door locks Courtesy Lamps Wiring Diagram, without Upfitter Package (2 of 2) for Chevrolet Chevy Express G2003 2500 List of elements for Courtesy Lamps Wiring Diagram, without Upfitter Package (2 of 2) for Chevrolet Chevy Express G2003 2500: 34 Cargo/cutaway w/o dh6 Dome Dome flour- escent fuse 2 10a Dome fluorescent work lamp 1 Dome fluorescent work lamp 2 Dome fluorescent work lamp relay (2004) (attached to left "b" pillar) Front courtesy reading lamps Front courtesy/ reading light G102 (left rear of engine) G403 (left rear of passenger compt, on center "d" pillar) Left front dome fluorescent work lamp Left rear dome fluorescent work lamp Left vanity mirror lamp Mid courtesy reading lamps Nca Passenger w/ dh6 Passenger/ cutaway w/ dh6 Rdng Rear courtesy reading lamps Rear fuse block (attached to left "b" pillar) Red Right dome fluorescent work lamp Right vanity mirror lamp S102 S300 S312 (in pfp/ uf2 harn) S314 (in vanity mirror harn) S322 S330 S348 S350 (in prp/ uf2 harn) S406 (in head- liner harn S407 Underhood lamp Instrument Illumination Wiring Diagram for Chevrolet Chevy Express G2003 2500 List of elements for Instrument Illumination Wiring Diagram for Chevrolet Chevy Express G2003 2500: 56 5 volt ref 6 bulbs A11 A12 Auxiliary blower motor switch B11 B12 Back-up lps ctrl Body control module (bcm) (lower right side of dash) Body fuse block (below left front seat) C36 = auxiliary heater Dimming input Dimming return Driver door lock switch Driver window switch Enc = hvac provisions auxiliary heater Front auxiliary hvac control assembly Front passenger door lock switch Front passenger window switch G301 (behind left kick panel) G302 (behind left kick panel) G303 (behind left kick panel) G304 (behind right kick panel) G347 (on bottom of left "b" pillar) Gnd Headlamp and panel dimmer switch Headlamp on ind Hvac control assembly Inflatable restraint i/p module disable switch Instrument cluster Led dimming sig Logic Panel lps dim Plumbing and wiring Pnk Rear auxiliary hvac control assembly Rear seat audio (rsa) control S247 S248 S249 S250 (in dash harn, 5 cm from air temperature actuator connector breakout) S314 S330 S355 S500 S600 Splice pack sp347 (indexing may vary) Tow/haul switch Traction control switch (2004) W/ c36/enc W/ rear aux controls W/o rear aux controls W/o yf7 W/yf7 With p/windows and door locks Yf7 recreational vehicle sales package, upfitter
POWER DISTRIBUTION Power Distribution Wiring Diagram (1 of 6) for Chevrolet Chevy Express G2003 2500 List of elements for Power Distribution Wiring Diagram (1 of 6) for Chevrolet Chevy Express G2003 2500: 72 (not used) (rfa fuse 20) (diagram 1 of 6) A10 A12 Abs fuse 48 60a Aux pwr fuse 29 20a Auxiliary power outlet B10 Battery Blow fuse 51 40a Blower motor resistor assembly Body control module (bcm) Body fuse block C2 a10 C2 b5 C2 b7 C2 f12 C3 a5 C3 b2 C6 b C7 a C8 a Cigar fuse 30 15a Cigar lighter D10 Data link connector (dlc) Driver seat adjuster switch (if equipped) E10 E12 Electronic brake control module (ebcm) F10 F12 Flasher fuse 14 15a From underhood fuse block b Front passenger seat adjuster switch (if equipped) Fusible link b Fusible link c G304 (behind right kick panel) Generator Hvac control assembly Instrument panel cluster (ipc) Ipc fuse 31 10a Left trailer stop/turn relay (if equipped) Mega fuse 65 125a Pcm bat fuse 2 20a Powertrain control module (pcm) Pwr seat circuit breaker 60 30a Radio Radio bat fuse 1 15a Red Remote control door lock receiver (if equipped) Rfa fuse 20 10a Rr def/htd mir fuse 8 20a S249 Spare fuse 64 Starter Stop lamp switch Stop lp fuse 7 15a Tbc 2 fuse 18 15a Tbc 3 fuse 16 15a Tbc 4 fuse 11 15a Tbc fuse 19 10a To body fuse block (door lks fuse 15) (diagram 2 of 6) To underhood fuse block (can vent fuse 34) (diagram 2 of 6) To underhood fuse block (tbc fuse 19) (diagram 1 of 6) Trl stop/trn fuse 17 15a Trlr fuse 13 30a Trlr fuse 50 30a Turn signal/ hazard flasher module Underhood fuse block Vehicle communication interface module (vcim) (if equipped) W/ rear window defogger/ heated mirrors Power Distribution Wiring Diagram (2 of 6) for Chevrolet Chevy Express G2003 2500 List of elements for Power Distribution Wiring Diagram (2 of 6) for Chevrolet Chevy Express G2003 2500: 53 (hdlp hibm relay) (diagram 2 of 6) (pwr seat circuit breaker 60) (diagram 1 of 6) A/c fuse 32 10a A/c relay Auxiliary 2 fuse 33 50a Auxiliary relay Body fuse block C1 e6 C4 r C5 a Can vent fuse 34 10a Cargo lks fuse 5 10a Cargo unlk relay Composite Door lks fuse 15 20a Door lks relay Drv lks fuse 7 10a Drv unlk relay Evaporative emissions (evap) canister vent solenoid From underhood fuse block (mega fuse 65) (diagram 1 of 6) From underhood fuse block c From underhood fuse block d Fuel pump fuse 12 20a Fuel pump relay Hdlp hibm relay Hdlp lobm relay Horn fuse 15 15a Horn relay Htd mir/defog fuse 12 30a Ign a fuse 49 40a Ign b fuse 52 40a Left headlamp Left hibm fuse 44 10a Left high beam headlamp Left lobm fuse 43 10a Left low beam headlamp Pass unlk relay Right headlamp Right hibm fuse 45 10a Right high beam headlamp Right lobm fuse 42 10a Right low beam headlamp Rr defog relay Sealed Spare fuse 33 10a Spare relay Starter relay To body fuse block (park lp relay) (diagram 3 of 6) To ignition switch (diagram 3 of 6) To underhood fuse block (ign a fuse 49) (diagram 2 of 6) Underhood fuse block Wpr fuse 41 15a Wpr relay Power Distribution Wiring Diagram (3 of 6) for Chevrolet Chevy Express G2003 2500 List of elements for Power Distribution Wiring Diagram (3 of 6) for Chevrolet Chevy Express G2003 2500: 70 (auxiliary 2 fuse 33) (diagram 2 of 6) (not used) (provisional) (rv/upfitter) Acc Body control module (bcm) Body fuse block Btsi fuse 28 10a Btsi/bu fuse 36 15a C320 C405 Cruise control module (if equipped) Ctsy lp relay (rv/upfitter) Ctsy lp/seo fuse 3 15a Cutaway F11 Fr prk fuse 22 10a From body fuse block g From underhood fuse block (ign a fuse 49) (diagram 2 of 6) From underhood fuse block (ign b, fuse 52) (diagram 2 of 6) Heated oxygen sensor (ho2s) bank 1 sensor 1 Heated oxygen sensor (ho2s) bank 1 sensor 2 Heated oxygen sensor (ho2s) bank 2 sensor 1 Heated oxygen sensor (ho2s) bank 2 sensor 2 Ignition switch Inflatable restraint i/p module disable switch (heavy duty) Inflatable restraint sensing & diagnostic module Inside rearview mirror (w/ temp display) Isrv fuse 26 10a Left front marker lamp Left front park/turn signal lamp Left tail/stop & turn signal lamp Left taillamp assembly License lamp Lock Lr prk fuse 18 10a Nca O2a fuse 40 15a O2b fuse 39 15a Off Park acc Park lp relay Park/ neutral position (pnp) switch Pcm ign 1 fuse 38 15a Pnk Pnk f Powertrain control module (pcm) Reverse Right front marker lamp Right front park/turn signal lamp Right tail/stop & turn signal lamp Right taillamp assembly Rr prk fuse 20 10a Run Sir fuse 37 10a Spare fuse 25 Spare fuse 35 Start Stop lamp switch Tbc ign 1 fuse 24 10a To body fuse block (auxiliary 1 fuse 32) (diagram 5 of 6) To body fuse block (brks fuse 11) (diagram 5 of 6) To underhood fuse block (crank fuse 27) (diagram 4 of 6) To underhood fuse block (eng 2 fuse 21) (diagram 4 of 6) To underhood fuse block (ign o fuse 6) (diagram 4 of 6) To underhood fuse block (tbc acc fuse 46) (diagram 4 of 6) Trailer wiring Trlr bu fuse 5 10a Trlr prk fuse 21 15a Underhood fuse block Upftr prk fuse 16 10a Power Distribution Wiring Diagram (4 of 6) for Chevrolet Chevy Express G2003 2500 List of elements for Power Distribution Wiring Diagram (4 of 6) for Chevrolet Chevy Express G2003 2500: 43 (4.3l) (4.8l/5.3l/ 6.0l) (except 4.3l) (not used) A/c relay A11 Automatic transmission B10 Body control module (bcm) C10 C12 C175 Crank fuse 27 10a Cruise control on/off switch D10 E10 E12 Eng 1 fuse 23 15a Eng 2 fuse 21 10a Evaporative emissions (evap) canister purge solenoid Fr wpr fuse 47 25a From ignition switch (diagram 3 of 6) From underhood fuse block (sir fuse 37) (diagram 3 of 6) Fuel injector Fuel injector (except 4.3l) Ign 0 fuse 6 10a Ign e fuse 22 10a Ignition coil Ignition coil module Instrument panel cluster Mass air flow (maf) sensor Park/ neutral position (pnp) switch Pnk Pnk pnk Powertrain control module (pcm) S184 (in odd ignition coil module jumper harness, on top left side of engine) S185 (in even ignition coil module jumper harness, on top right side of engine) Stop lamp switch Tbc acc fuse 46 10a Turn signal switch Turn signal/ multifunction switch Underhood fuse block Windshield wiper motor Power Distribution Wiring Diagram (5 of 6) for Chevrolet Chevy Express G2003 2500 List of elements for Power Distribution Wiring Diagram (5 of 6) for Chevrolet Chevy Express G2003 2500: 50 (in front headliner (in upfitter hvac control harness, approx 88 cm from c303 breakout) s307 (in rear hvac harness, approx 13 cm from auxiliary blower motor connector breakout) s405 (not used) (or red) (provisional) (provisional) (rv/upfitter) (w/ outside heated mirrors & rear window defogger) (w/ rv upfitter option) (w/o rv upfitter option) Air temperature actuator Auxiliary 1 fuse 32 50a Auxiliary air temperature actuator Auxiliary high speed blower motor relay Auxiliary hvac control processor Auxiliary low speed blower motor relay Auxiliary med speed blower motor relay Auxiliary mode actuator Auxiliary relay B10 Body fuse block Brks fuse 11 10a C222 C407 Driver window switch (if equipped) E11 Electronic brake control module (ebcm) F10 F11 From body fuse block (ctsy lp/seo fuse 3) (diagram 3 of 6) From ignition switch (diagram 3 of 6) Front auxiliary hvac control assembly Front passenger window switch (if equipped) Harness, approx 52 cm from c304 breakout) s307 Hvac 1 fuse 9 10a Hvac control assembly Hvac fuse 10 20a Not available fuse 17 Osrvm fuse 2 10a Outside rearview mirror switch (if equipped) Pwr wnd circuit breaker 25a Rear auxiliary hvac control assembly Rr blower fuse 13 30a To s302 (diagram 6 of 6) To s412 (diagram 6 of 6) Underhood fuse block W/ auxiliary hvac W/ rear auxiliary control W/ rear auxiliary hvac W/o rear auxiliary control Wnd rap relay Power Distribution Wiring Diagram (6 of 6) for Chevrolet Chevy Express G2003 2500 List of elements for Power Distribution Wiring Diagram (6 of 6) for Chevrolet Chevy Express G2003 2500: 29 (in prp/uf2 harness, approx 8 cm from rear fuse block) s303 (in rear hvac harness, approx 20 cm from auxiliary blower motor connector breakout) s412 (or red) (provisional) Auxiliary high speed blower motor relay Auxiliary low speed blower motor relay Auxiliary med speed blower motor relay C321 C409 Dome fluorescent work lamp 1 Dome fluorescent work lamp 2 Dome fluorescent work lamps fuse 2 10a From body fuse block (auxiliary 1 fuse 32) (diagram 5 of 6) From body fuse block (rr blower fuse 13) (diagram 5 of 6) Left front dome fluorescent work lamp Left rear dome fluorescent work lamp Left side front access panel relay 5 Left side rear access panel relay 1 Panel actuator fuse 3 15a Rear fuse block Rear rear fuse fuse block block Red Red (in prp/uf2 harness, approx 15 cm from rear fuse block) s302 Right front dome fluorescent work lamp Right side access panel relay 6 W/ auxiliary hvac W/ commercial option W/o auxiliary hvac W/o commercial option
POWER DOOR LOCKS Power Door Locks Wiring Diagram for Chevrolet Chevy Express G2003 2500 List of elements for Power Door Locks Wiring Diagram for Chevrolet Chevy Express G2003 2500: 46 (commercial/ tradesman) (hinged door) (passenger van) (sliding door) A10 A11 B10 Body control module (behind lower right side of dash) Body fuse block (under left front seat) C12 Cargo door jamb switch Cargo unlk fuse 5 10a Cargo unlk relay D12 Door lks fuse 15 20a Door lks relay Door lock ctrl Driver door jamb switch Driver door lock switch Drv lks fuse 7 10a Drv unlk relay E10 E12 Front passenger door jamb switch Front passenger door lock switch G302 (behind left kick panel) G347 (bottom of left "b" pillar) G402 (top of left "d" pillar) Hot at all times Left door contact plate (left "b" pillar) Left rear door lock actuator Lock actuator Pass unlk relay Rear cargo door lock switch Release rly ctrl Right door contact plate (right "b" pillar) Right rear door S205 (in prp/uf2 harn, approx 4 cm from c205) S500 S600 Splice pack sp347 Sw lock ctrl Sw unlock ctrl Tan Unlock ctrl Unlock rly ctrl
POWER MIRRORS Power Mirrors Wiring Diagram for Chevrolet Chevy Express G2003 2500 List of elements for Power Mirrors Wiring Diagram for Chevrolet Chevy Express G2003 2500: 14 (bottom of left "b" pilar) g347 (left front door harness, approx 7 cm from power mirror motor connector) Body fuse block Driver outside rearview mirror Hot at all times Left mirror Osrvm fuse 2 10a Outside rearview mirror switch Passenger outside rearview mirror Right mirror Right/ left motor S500 S502 Up/ down motor
POWER SEATS Power Seats Wiring Diagram for Chevrolet Chevy Express G2003 2500 List of elements for Power Seats Wiring Diagram for Chevrolet Chevy Express G2003 2500: 32 All- down All-up Back Body fuse block (below left front seat) C1 a12 C2 b6 C2 f12 Down Driver seat adjuster switch Driver seat motors E12 c2 Entire seat For- ward Front down Front passenger seat adjuster switch Front passenger seat motors Front up Front vertical G347 (on bottom of left "b" pillar) Horizontal Hot at all times Nca Pwr seat circuit breaker 60 30a Rear down Rear up Rear vertical Right power seat forward/ rearward motor Right power seat front tilt motor Right power seat rear tilt motor S304 Splice pack Underhood fuse block
POWER WINDOWS Power Windows Wiring Diagram for Chevrolet Chevy Express G2003 2500 List of elements for Power Windows Wiring Diagram for Chevrolet Chevy Express G2003 2500: 19 (left kick panel) g201 (left kick panel) g347 Body control module (lower right side of dash) Body fuse block (on lower left kick panel) Driver window motor Driver window switch E11 F11 Front passenger window motor Front passenger window switch G302 (behind left kick panel) Hot at all times Interior lights system Left Pwr wnd circuit breaker 34 25a Right S500 Tan Wnd rap relay
RADIO Radio Wiring Diagram, with Rear Seat Audio for Chevrolet Chevy Express G2003 2500 List of elements for Radio Wiring Diagram, with Rear Seat Audio for Chevrolet Chevy Express G2003 2500: 57 (in body harn, 10 cm from chmsl conn breakout) (in body harn, 52 cm from c417 breakout) A10 A11 A12 Antenna Antenna in B10 B11 B12 b12 b12 b12 Battery Cell phone ref Cell phone sig Class 2 data Computer data lines system D10 c2 Dash lmp dim cntrl G303 (behind left kick panel) Ground Hot at all times Interior lights system Left front door speaker Left front door tweeter speaker Left rear door speaker Left rear speaker Lf speaker (+) Lf speaker (-) Lr mid spk out + Lr mid spk out - Lr speaker (+) Lr speaker (-) Nca Radio Radio bat fuse 1 15a Rear seat audio control Rem radio cntrl sig Rem radio sig Rem radio sup volt Remote rad volt Rf speaker (+) Rf speaker (-) Right front door speaker Rr mid spk out + Rr mid spk out - Rr speaker (+) Rr speaker (-) Rsa enable signal Rsa switch S450 S451 S452 S453 Tan Underhood fuse block (on left side of engine compartment) Vehicle communication interface module Voice low ref Voice signal Radio Wiring Diagram, without Rear Seat Audio for Chevrolet Chevy Express G2003 2500 List of elements for Radio Wiring Diagram, without Rear Seat Audio for Chevrolet Chevy Express G2003 2500: 44 (in body harn, 10 cm from chmsl conn breakout) (in body harn, 52 cm from c417 breakout) A10 A11 A12 Antenna Antenna in B10 B11 B12 b12 b12 b12 Battery C320 Cell phone ref Cell phone sig Class 2 data Computer data lines system D not used D10 c2 G303 (behind left kick panel) Ground Hot at all times Left front door speaker Left front door tweeter speaker Lf speaker (+) Lf speaker (-) Lr speaker (+) Lr speaker (-) Nca Radio Radio bat fuse 1 15a Rf speaker (+) Rf speaker (-) Right front door speaker Right front door tweeter speaker Rr speaker (+) Rr speaker (-) S450 S451 S452 S453 Tan Underhood fuse block Voice low ref Voice signal
SHIFT INTERLOCK Shift Interlock Wiring Diagram for Chevrolet Chevy Express G2003 2500 List of elements for Shift Interlock Wiring Diagram for Chevrolet Chevy Express G2003 2500: 10 A/t shift lock control solenoid (right side of steering column) Btsi fuse 28 10a Btsi/bu fuse 36 15a G302 (behind left kick panel) Hot in run or start Park/ neutral position switch (on left side of transmission) Pnk S264 Stoplamp switch (above brake pedal) Underhood fuse block
STARTING/CHARGING Charging Wiring Diagram for Chevrolet Chevy Express G2003 2500 List of elements for Charging Wiring Diagram for Chevrolet Chevy Express G2003 2500: 24 (not used) (on lower right front of eng) (on right front frame rail, in eng compt) (on right front of eng compt) g106 Battery Battery ind Class 2 serial data E12 Fusible link c G104 G105 Generator Hot in run & start Ign e fuse 10a Ign volt Instrument cluster Logic Pnk Power distribution system Powertrain control module (pcm) (in eng compt, on left inner fender) Red Splice sp200 (in dash wiring harn, 10 cm from underhood pass-through grommet breakout) Starting/charging system (starter motor) Underhood fuse block (on left side of eng compt) Starting Wiring Diagram for Chevrolet Chevy Express G2003 2500 List of elements for Starting Wiring Diagram for Chevrolet Chevy Express G2003 2500: 40 (on lower right front of eng) (on right front frame rail, in eng compt) (on right front of eng compt) Acc C1 b10 C1 c1 C2 a3 C2 e C2 e3 C2 g Crank fuse 10a Crank sign D12 F11 Fusible link b G104 G105 G106 Generator Hot at all times Ign 1 fuse 15a Ign a fuse 40a Ign b fuse 40a Ignition switch Left battery Lock Off Park/neutral position switch (on left side of transmission) Pnk Power distribution system Powertrain control module (pcm) (in eng compt, on left inner fender) Red Run Run off Start Starter enable relay ctrl Starter motor Starter relay Starter solenoid Underhood fuse block (on left side of eng compt)
SUPPLEMENTAL RESTRAINTS Supplemental Restraints Wiring Diagram (1 of 2) for Chevrolet Chevy Express G2003 2500 List of elements for Supplemental Restraints Wiring Diagram (1 of 2) for Chevrolet Chevy Express G2003 2500: 35 Class 2 serial data signal Control Exterior lights system G301 (behind left kick panel) G304 (under left front seat) Ground Heavy duty High control Hot in run or start I/p lamps dimming control I/p module disable switch signal I/p module suppression indicator control Ignition 1 voltage Igniton 1 volt Inflatable restraint i/p module 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 Interior lights system Light duty Logic Low control Low reference Nca Off Pnk Shorting bar Signal Sir fuse 10a Stage 1 Stage 2 Tan Twisted pair wires Underhood fuse block (on left side of eng compt) Supplemental Restraints Wiring Diagram (2 of 2) for Chevrolet Chevy Express G2003 2500 List of elements for Supplemental Restraints Wiring Diagram (2 of 2) for Chevrolet Chevy Express G2003 2500: 21 (under left side of dash) data link connector Air bag Class 2 (sdm) Class 2 serial data G347 Ign Inflatable restraint front end sensor (on lower center of radiator support) Instrument panel cluster Left front seat belt pretensioner (on right side of left front seat) Left inflatable restraint seat position switch (on left seat track) Left seat belt switch (closed with seat belt buckled) (in left front seat belt latch) Light duty Nca Pnk Right front seat belt pretensioner (on left side of right front seat) Right inflatable restraint seat position switch (on right seat track) S313 (in body harn, 11 cm from c307) Shorting bar Splice pack sp 347 (in body harn, 19 cm from c308 breakout) Splice pack sp200 (in dash wiring harn, 10 cm from underhood pass-through grommet breakout) Twisted pair wires
TRANSMISSION A/T Wiring Diagram (1 of 2) for Chevrolet Chevy Express G2003 2500 List of elements for A/T Wiring Diagram (1 of 2) for Chevrolet Chevy Express G2003 2500: 62 (behind lower right side of dash) body control module (left side of transmission) park/neutral position switch (not used) (under left side of dash) data link connector +5v 1-2 ss ctrl 2-3 ss ctrl 3-2 ss ctrl A10 At iss high sig At iss low sig Automatic transmission input shaft speed sensor (4l80e) (on left side of transmission) B11 B12 Brk sw sig Cls 2 data Ect sig Engine coolant temperature sensor (on left side of engine) Front high sig Front low sig G102 (left rear of engine) G103 (right rear of engine) G302 (behind left kick panel) Gnd Hot at all times Hot in accy, run & start Hot in run & start Ign Ign 0 fuse 6 10a Instrument panel cluster Pc sol hi ctrl Pc sol lo ctrl Pcm batt fuse 2 20a Pcm ign 1 fuse 38 15a Pnk Powertrain control module (in engine compt, on left inner fender) Press sens sig Prnd a sig Prnd b sig Prnd c sig Prnd p sig Prndl indicator Range b Range c Ref low S101 S102 S247 Serial data Sp200 (in dash wiring harn, 10cm from unerhood pass- through grommet breakout) Tan Tcc pwm ctrl Tcc sol ctrl Tft sens sig Throttle position sensor (on left side of throttle body) Tow/ haul switch Tow/haul indicator Tow/haul switch Tp sens sig Under- hood fuse block Vehicle speed sensor (4l60-e) (on right side of transmission) Vehicle speed sensor (4l80-e) (on left side of transmission) A/T Wiring Diagram (2 of 2) for Chevrolet Chevy Express G2003 2500 List of elements for A/T Wiring Diagram (2 of 2) for Chevrolet Chevy Express G2003 2500: 23 (4l60e) (4l60e) s 1-2 sol 2-3 sol 3-2 sol A red A/t fluid pressure manual valve position switch Automatic transaxle C12 Hot in run & start Ign e fuse 22 10a M tan N pnk Pc sol valve Pnk Red Rev Stop- lamp switch (above brake pedal) Tan Tcc pwm sol Tcc sol Tft sensor Underhood fuse block
WARNING SYSTEMS Warning Systems Wiring Diagram for Chevrolet Chevy Express G2003 2500 List of elements for Warning Systems Wiring Diagram for Chevrolet Chevy Express G2003 2500: 44 (behind left kick panel) g302 (behind left kick panel) g303 (partial) (under left side of dash) A10 A11 A12 Assembly breakout) B10 B11 B12 Battery Body control module (bcm) (behind lower right side of dash) Brake warn ind ctrl Chime module (in center of dash, attached to radio connector) D10 Data link connector (dlc) Ground Headlamp & panel dimmer switch Headlamps on signal Hot at all times Ignition key alarm switch (inside top of steering column) Instrument panel cluster (ipc) Key in switch signal Left turn signal Optional Park brake sw signal Park brake switch (under left side of dash) Power brake (p/b) booster fluid flow alarm switch (near power steering pump, in outlet hose) Power brake (p/b) booster fluid pressure alarm switch (near power brake booster, in booster inlet hose) Radio Radio bat fuse 1 15a Right turn signal S247 S248 S264 Serial data Splice pack sp200 (in dash wiring harness, 10 cm from underhood pass-through grommet breakout) Tan Turn signal/hazard flasher module (behind left center of dash) Underhood fuse block (on left side of engine compartment) W/ radio W/o premium outside electric mirrors W/o radio W/premium outside electric mirrors
WIPER/WASHER Wiper/Washer Wiring Diagram for Chevrolet Chevy Express G2003 2500 List of elements for Wiper/Washer Wiring Diagram for Chevrolet Chevy Express G2003 2500: 25 Accessory voltage C10 Fr wiper fuse 47 25a G302 (behind left kick panel) Ground Hot at all times Hot in run and acc Lsd Mist Off Pnk Pulse S247 S264 Turn signal multi- function switch Underhood fuse block (on left side of engine compt) Wash Windshield washer fluid pump (on washer fluid reservoir) Windshield washer relay cntrl Windshield wiper high signal Windshield wiper motor (on left side of firewall) Windshield wiper switch signal Windshield wiper/ washer switch Wpr fuse 41 15a Wpr relay 53
