Diagram sections — 26 (74 total)
AIR CONDITIONING ANTI-LOCK BRAKES ANTI-THEFT COMPUTER DATA LINES COOLING FAN CRUISE CONTROL DEFOGGERS ELECTRONIC POWER STEERING ENGINE PERFORMANCE EXTERIOR LIGHTS GROUND DISTRIBUTION HEADLIGHTS HORN INSTRUMENT CLUSTER INTERIOR LIGHTS POWER DISTRIBUTION POWER DOOR LOCKS POWER MIRRORS POWER SEATS POWER WINDOWS SHIFT INTERLOCKS STARTING/CHARGING SUPPLEMENTAL RESTRAINTS TRANSMISSION WARNING SYSTEMS WIPER/WASHER
AIR CONDITIONING
5.7L 5.7L VIN R, Compressor Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for 5.7L VIN R, Compressor Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 33 (engine harn, near diode) 22 cm from ebcm breakout) A/c comp fuse 10a A/c compressor clutch A/c compressor clutch relay (in underhood fuse block) A/c compressor cycling switch (in low pressure line, on accumulator) A/c control A/c disable A/c high pressure cutout switch (on a/c compressor) A/c low pressure cutout switch (on a/c compressor) A/c req A/c switch Blower switch Diode Fuse block G104 (top right side of cylinder head) G105 (right side of engine) Hot in run Hot in run or start Htr a/c fuse 12 25a Hvac control module Ign e fuse 10a Ignition Near egr valve breakout) Off Pnk S146 (eng harn, pnk S185 S186 S268 (i/p harn, behind center of dash) Sw sig Underhood fuse block Vehicle control module (left side of engine compt) 5.7L VIN R, Heater Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for 5.7L VIN R, Heater Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 36 (behind left (hvac harn, 8 cm from recirc door breakout) s244 (i/p harn, 24 cm from i/p cluster breakout) (right side of dash) g202 Air temp dr sensor Battery Blower fuse 3 50a Blower motor (under right side of dash) Blower resistor (on blower motor housing) Blower switch Defogger element Front mode door motor (on front a/c-heater housing) Front temperature door motor (on front a/c-heater housing) Fuse block G200 Ground High blower relay (on top of front a/c- heater blower housing) Hot at all times Hot in run Htr-a/c fuse 12 25a Hvac control module Ignition Illumination Interior lights system Mode signal Off Rear defogger system Recirc ctrl Recirculation door motor (on front a/c-heater housing) Red S243 (hvac harn, 4 cm from recirc door breakout) S268 (i/p harness, behind center of dash) S298 Side of dash) Tan Underhood fuse/relay center 5.7L VIN R, Manual A/C Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for 5.7L VIN R, Manual A/C Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 74 (engine harn, near diode) (engine harness, 22 cm from ebcm breakout, 7.4l) (engine harness, near ebcm breakout) (engine harness, near egr valve breakout) (exc 4.3 l) (fwd lamps harn, 5 cm from right headlamp breakout) (hvac harness, 4 cm from recirc door breakout) (i/p harn, 28 cm from cluster breakout) (i/p harness, behind center of dash) (right side A/c comp fuse 10a A/c compressor clutch A/c compressor clutch relay (in underhood fuse/relay center) A/c compressor cycling switch (in low pressure line, on accumulator) A/c ctrl A/c disable A/c high pressure cutout switch (on a/c compressor) A/c low pressure cutout switch (on a/c compressor) A/c req A/c switch Air temp dr sensor Aux fan fuse 30a Auxiliary cooling fan motor Auxiliary cooling fan relay (exc 4.3l) (in underhood fuse/relay center) Battery Blower fuse 3 50a Blower motor (under right side of dash) Blower resistor (on blower motor housing) Blower switch Defogger element Diode Front mode door motor (on front a/c-heater housing) Front temperature door motor (on front a/c-heater housing) Fuse block G104 (top right side of cylinder head) G105 (right side of engine) G112 (right front of engine compartment) G200 (behind left side of dash) G202 Ground High blower relay (on top of front a/c-heater housing) Hot at all times Hot in run Hot in run or start Htr a/c fuse 12 25a Hvac control module Ign e fuse 10a Ignition Illumination Interior lights system Mode signal Of dash) Off Pnk Rear defogger system Recirc door signal Recirculation door motor (on front a/c-heater housing) Red Relay ctrl S103 S110 S128 S146 S185 S186 S212 (i/p harn, behind center of dash) S243 S244 (hvac harn, 8 cm from recirc door breakout) S268 S298 Sw sig Tan Underhood fuse block Vehicle control module (left side of engine compt)
6.5L 6.5L VIN F, Compressor Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for 6.5L VIN F, Compressor Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 31 (engine harn, near diode) 30 cm from ebcm breakout) A/c comp fuse 10a A/c compressor clutch A/c compressor clutch relay (in underhood fuse/relay center) A/c compressor cycling switch (in low pressure line, on accumulator) A/c control A/c disable A/c enable A/c high pressure cutout switch (on a/c compressor) A/c low pressure cutout switch (on a/c compressor) A/c switch Blower switch Diode Fuse block G105 (right side of engine) Hot in run Hot in run or start Htr a/c fuse 12 25a Hvac control module Ign 1 fuse 10a Ignition Off Pnk Powertrain control module (behind right side of dash) Recirc signal Recirculation door motor (on a/c-heater housing) S185 S186 S268 (i/p harn, behind center of dash) Underhood fuse block 6.5L VIN F, Manual A/C Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for 6.5L VIN F, Manual A/C Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 66 (behind right (engine harn, (engine harn, near diode) (engine harness, near ebcm breakout) (hvac harness, 4 cm from recirc door breakout) (hvac harness, 8 cm from recirc door breakout) (i/p harn, 24 cm from cluster breakout) (i/p harness, behind center of dash) (right side of dash) g202 A/c comp fuse 10a A/c compressor clutch A/c compressor clutch relay (in underhood fuse center) A/c compressor cycling switch (in low pressure line, on accumulator) A/c ctrl A/c disable A/c enable A/c high pressure cutout switch (on a/c compressor) A/c low pressure cutout switch (on a/c compressor) A/c switch Air temp dr signal Battery Block Blower fuse 3 50a Blower motor Blower resistor (under right side of dash, on heater housing) Blower switch Defogger element Diode Front mode door motor (on front a/c-heater housing) Front temperature door motor (on front a/c-heater housing) Fuse Fuse block G105 (right side of engine) G200 (behind left side of dash) Ground Heater and a/c control module High blower relay (under dash on top of heater-a/c housing) Hot at all times Hot in run Hot in run or start Htr-a/c fuse 12 25a Ign e fuse 10a Ignition Illumination Interior lights system Mode signal Near diode) Off Pnk Powertrain control module Rear defogger system Recirc signal Recirculation door motor (under dash on heater- a/c housing) Red S107 (engine harn, 30 cm from breakout to ebcm) S110 S185 S186 S212 (i/p harn, behind center of dash) S243 S244 S268 S298 Side of dash) Tan Underhood
7.4L 7.4L VIN J, Compressor Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for 7.4L VIN J, Compressor Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 33 (engine harn, near diode) 22 cm from ebcm breakout) A/c comp fuse 10a A/c compressor clutch A/c compressor clutch relay (in underhood fuse block) A/c compressor cycling switch (in low pressure line, on accumulator) A/c control A/c disable A/c high pressure cutout switch (on a/c compressor) A/c low pressure cutout switch (on a/c compressor) A/c req A/c switch Blower switch Diode Fuse block G104 (top right side of cylinder head) G105 (right side of engine) Hot in run Hot in run or start Htr a/c fuse 12 25a Hvac control module Ign e fuse 10a Ignition Near egr valve breakout) Off Pnk S146 (eng harn, pnk S185 S186 S268 (i/p harn, behind center of dash) Sw sig Underhood fuse block Vehicle control module (left side of engine compt) 7.4L VIN J, Heater Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for 7.4L VIN J, Heater Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 36 (behind left (hvac harn, 8 cm from recirc door breakout) s244 (i/p harn, 24 cm from i/p cluster breakout) (right side of dash) g202 Air temp dr sensor Battery Blower fuse 3 50a Blower motor (under right side of dash) Blower resistor (on blower motor housing) Blower switch Defogger element Front mode door motor (on front a/c-heater housing) Front temperature door motor (on front a/c-heater housing) Fuse block G200 Ground High blower relay (on top of front a/c- heater blower housing) Hot at all times Hot in run Htr-a/c fuse 12 25a Hvac control module Ignition Illumination Interior lights system Mode signal Off Rear defogger system Recirc ctrl Recirculation door motor (on front a/c-heater housing) Red S243 (hvac harn, 4 cm from recirc door breakout) S268 (i/p harness, behind center of dash) S298 Side of dash) Tan Underhood fuse/relay center 7.4L VIN J, Manual A/C Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for 7.4L VIN J, Manual A/C Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 74 (engine harn, near diode) (engine harness, 22 cm from ebcm breakout, 7.4l) (engine harness, near ebcm breakout) (engine harness, near egr valve breakout) (exc 4.3 l) (fwd lamps harn, 5 cm from right headlamp breakout) (hvac harness, 4 cm from recirc door breakout) (i/p harn, 28 cm from cluster breakout) (i/p harness, behind center of dash) (right side A/c comp fuse 10a A/c compressor clutch A/c compressor clutch relay (in underhood fuse/relay center) A/c compressor cycling switch (in low pressure line, on accumulator) A/c ctrl A/c disable A/c high pressure cutout switch (on a/c compressor) A/c low pressure cutout switch (on a/c compressor) A/c req A/c switch Air temp dr sensor Aux fan fuse 30a Auxiliary cooling fan motor Auxiliary cooling fan relay (exc 4.3l) (in underhood fuse/relay center) Battery Blower fuse 3 50a Blower motor (under right side of dash) Blower resistor (on blower motor housing) Blower switch Defogger element Diode Front mode door motor (on front a/c-heater housing) Front temperature door motor (on front a/c-heater housing) Fuse block G104 (top right side of cylinder head) G105 (right side of engine) G112 (right front of engine compartment) G200 (behind left side of dash) G202 Ground High blower relay (on top of front a/c-heater housing) Hot at all times Hot in run Hot in run or start Htr a/c fuse 12 25a Hvac control module Ign e fuse 10a Ignition Illumination Interior lights system Mode signal Of dash) Off Pnk Rear defogger system Recirc door signal Recirculation door motor (on front a/c-heater housing) Red Relay ctrl S103 S110 S128 S146 S185 S186 S212 (i/p harn, behind center of dash) S243 S244 (hvac harn, 8 cm from recirc door breakout) S268 S298 Sw sig Tan Underhood fuse block Vehicle control module (left side of engine compt)
ANTI-LOCK BRAKES
5.7L 5.7L VIN R, Anti-lock Brake Wiring Diagrams for Chevrolet Cab & Chassis C1999 2500 List of elements for 5.7L VIN R, Anti-lock Brake Wiring Diagrams for Chevrolet Cab & Chassis C1999 2500: 54 4wd sw input Abs fuse 60a Abs ind Abs ind ground Battery Brake fuse 18 10a Brake ind Brake ind input Brake lamp ind out Brake pressure warning switch (underside of ebcm) Brake sw input Brake sw output Cruise control system Data link connector (left of steering column) Daytime running lamps module (behind left side of dash) Ebcm ground Electronic brake control module (left side of engine compt) Engine control system Evo/ passlock control module (under center of dash) Front axle actuator (right front of front axle) G119 (right front of engine) Gauges fuse 4 10a Hot at all times Hot in run Hot in run and start I/p fuse block (under left side of dash) Ignition Instrument cluster Left front wheel speed sensor M/t only Pnk Pump motor ground Red Right front wheel speed sensor S147 S150 (engine harn, approx 13 cm from ebcm breakout) S151 S152 (engine harness, near ebcm breakout) S213 S280 (i/p harn, approx 5 cm from dlc breakout) Sensor high Sensor low Serial data Serial data line Stoplamp switch (top of brake pedal) Tan Transfer case shift control module (on steering column support bracket) Underhood fuse/relay center (left rear of engine compt) Vehicle control module (left side of engine compt) Vehicle speed sensor (left side of transmission/ transfer case) Vehicle speed sig Vss (+) Vss (-) Vss sig
6.5L 6.5L VIN F, Anti-lock Brake Wiring Diagrams for Chevrolet Cab & Chassis C1999 2500 List of elements for 6.5L VIN F, Anti-lock Brake Wiring Diagrams for Chevrolet Cab & Chassis C1999 2500: 52 (engine harn, approx 40-50 cm before ebcm harn breakout) s157 4wd sw input Abs fuse 60a Abs ind Abs ind ground Battery Brake fuse 18 10a Brake ind Brake ind input Brake pressure warning switch (underside of ebcm) Brake sw input Cruise control system Data link connector (left of steering column) Daytime running lamps module (behind left side of dash) Diagnostic signal Diode 1 Ebcm ground Electronic brake control module (left side of engine compt) Engine control system Evo/ passlock control module (under center of dash) Front axle actuator (right front of front axle) G117 (right rear of engine) Gauges fuse 4 10a Hot at all times Hot in run Hot in run and start I/p fuse block (under left side of dash) Ignition Instrument cluster Left front wheel speed sensor M/t only Pnk Powertrain control module (behind right side side of dash, near blower motor) Pump motor ground Red Right front wheel speed sensor S107 S150 (engine harn, approx 13 cm from ebcm breakout) S151 S152 (engine harness, near ebcm breakout) S213 S280 (i/p harn, approx 5 cm from dlc breakout) Sensor high Sensor low Serial data Stoplamp switch (top of brake pedal) Tan Transfer case shift control module (on steering column support bracket) Underhood fuse/relay center (left rear of engine compt) Vehicle speed sensor (left side of transmission/ transfer case) Vehicle speed sensor buffer (behind right side of dash) Vss sig
7.4L 7.4L VIN J, Anti-lock Brake Wiring Diagrams for Chevrolet Cab & Chassis C1999 2500 List of elements for 7.4L VIN J, Anti-lock Brake Wiring Diagrams for Chevrolet Cab & Chassis C1999 2500: 54 4wd sw input Abs fuse 60a Abs ind Abs ind ground Battery Brake fuse 18 10a Brake ind Brake ind input Brake lamp ind out Brake pressure warning switch (underside of ebcm) Brake sw input Brake sw output Cruise control system Data link connector (left of steering column) Daytime running lamps module (behind left side of dash) Ebcm ground Electronic brake control module (left side of engine compt) Engine control system Evo/ passlock control module (under center of dash) Front axle actuator (right front of front axle) G119 (right front of engine) Gauges fuse 4 10a Hot at all times Hot in run Hot in run and start I/p fuse block (under left side of dash) Ignition Instrument cluster Left front wheel speed sensor M/t only Pnk Pump motor ground Red Right front wheel speed sensor S147 S150 (engine harn, approx 13 cm from ebcm breakout) S151 S152 (engine harness, near ebcm breakout) S213 S280 (i/p harn, approx 5 cm from dlc breakout) Sensor high Sensor low Serial data Serial data line Stoplamp switch (top of brake pedal) Tan Transfer case shift control module (on steering column support bracket) Underhood fuse/relay center (left rear of engine compt) Vehicle control module (left side of engine compt) Vehicle speed sensor (left side of transmission/ transfer case) Vehicle speed sig Vss (+) Vss (-) Vss sig
ANTI-THEFT Passlock Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for Passlock Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 36 (dash harn, 5 cm from dlc breakout) s280 12v 12v reg 5 volt ref Capacitor Data link connector (under left side of dash) Electronic power steering system Engine controls system Evo sol fd Evo sol out Evo/passlock module (under center of dash) G134 (diesel: front top of engine, gas: right top center of cylinder head) Gauges fuse 4 10a Grd Hot at all times Hot in run or start I/p fuse block Ign Instrument cluster Nca Passlck sig Passlock sensor (internal to steering column) Passlock signal Pnk Resistor 10 ohms S213 S215 Sec ind out Security fuse 21 10a Security indicator Sens ret Sensor grd Serial data Steering handwheel speed sensor (sensor ground) Vss Whl pos sig
COMPUTER DATA LINES Computer Data Lines for Chevrolet Cab & Chassis C1999 2500 List of elements for Computer Data Lines for Chevrolet Cab & Chassis C1999 2500: 34 (diesel) g134 (front to of engine) (right front of eng, near thermostat housing) (gas) g131 13 cm from ebcm breakout) Automatic transfer case control module (behind left side of dash) Aux pwr fuse 7 25a Data clss Data clss 2 Data link connector (dlc) (under left side of dash, left of steering column) Diag enable Diesel Electronic brake control module (ebcm) (on left side of engine compt) Electronic variable orifice/passlock control module (under center of dash) Except luxury G202 (behind left side of dash) Gasoline Hot at all times I/p fuse block Inflatable restraint sensing & diagnostic module (under driver's seat carpet) Powertrain control module (pcm) (behind right side of dash, near blower motor) Prog enable Radio Remote control door lock receiver (behind center of dash) S204 S215 S245 S272 S280 (dash harness, approx 5 cm from dlc breakout) S294 Serial data Tan Transfer case control module (tccm) (under dash, on steering column support bracket) Uart data Vehicle control module (vcm) (on left side of engine compt) Vehicle interface unit
COOLING FAN Cooling Fan Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for Cooling Fan Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 14 (fwd lamps harn, 5 cm from right headlamp breakout) (in underhood fuse/relay center) A/c comp fuse 10a Aux fan fuse 30a Auxiliary cooling fan motor Auxiliary cooling fan relay G112 (right front of engine compartment) Hot at all times Hot in run or start Red Relay ctrl S128 Underhood fuse block Vehicle control module (left rear of engine compt)
CRUISE CONTROL
5.7L 5.7L VIN R, Cruise Control Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for 5.7L VIN R, Cruise Control Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 45 (i/p harn, 20 cm from heater/ a/c breakout) s222 (i/p harn, left rear of engine compt) A/t A12 A13 A14 A15 Brake fuse 18 10a Clutch pedal position switch (top of clutch pedal) Cruise control module (left rear of engine compartment) Cruise control switch Cruise engage input Cruise fuse 6 10a Cruise on input Engine control system Exterior light system G119 (right front of engine, near thermostat housing) Ground Hot at all times Hot in run I/p fuse block (left side of dash) Ignition M/t Off R/a Resume/accel sig S/c S153 S215 S220 (i/p harness, 6 cm from steering column harness breakout) S221 (i/p harn, 20 cm from cluster breakout) S299 Set/coast sig Shift inter- lock system Speed sensor input Speed sensor output Stop/haz fuse 1 20a Stoplamp or clutch sw input Stoplamp sw input Stoplamp switch (top of brake pedal) Vcm signal Vehicle control module (vcm) (left side of engine compt) Vehicle speed sensor (vss) (left side of transmission) Vss high Vss low
6.5L 6.5L VIN F, Cruise Control Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for 6.5L VIN F, Cruise Control Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 44 (behind right side of dash) (behind right side of dash) powertrain control module (pcm) (i/p harn, 6 cm from steering column breakout) s220 A/t A11 A12 A13 A14 A15 Antilock brake system B10 B11 Brake fuse 18 10a Clutch pedal position switch (top of clutch pedal) Cruise control switch Cruise fuse 6 10a Cruise on input D10 Engine control system Exterior light system Hot at all times Hot in run I/p fuse block (under left side of dash) M/t Off R/a Resume/accel sig S/c S152 (eng harn, 4 cm from i/p harn breakout) S211 S220 S222 (i/p harn, 20 cm from inflatable restraint switch breakout) S299 Set/coast sig Stop/haz fuse 1 20a Stoplamp switch (top of brake pedal) Stoplamp switch input Stoplamp/ clutch switch input Vehicle speed sensor (vss) (left side of transmission) Vehicle speed sensor buffer Vss high Vss input Vss low Vss output
7.4L 7.4L VIN J, Cruise Control Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for 7.4L VIN J, Cruise Control Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 45 (i/p harn, 20 cm from heater/ a/c breakout) s222 (i/p harn, left rear of engine compt) A/t A12 A13 A14 A15 Brake fuse 18 10a Clutch pedal position switch (top of clutch pedal) Cruise control module (left rear of engine compartment) Cruise control switch Cruise engage input Cruise fuse 6 10a Cruise on input Engine control system Exterior light system G119 (right front of engine, near thermostat housing) Ground Hot at all times Hot in run I/p fuse block (left side of dash) Ignition M/t Off R/a Resume/accel sig S/c S153 S215 S220 (i/p harness, 6 cm from steering column harness breakout) S221 (i/p harn, 20 cm from cluster breakout) S299 Set/coast sig Shift inter- lock system Speed sensor input Speed sensor output Stop/haz fuse 1 20a Stoplamp or clutch sw input Stoplamp sw input Stoplamp switch (top of brake pedal) Vcm signal Vehicle control module (vcm) (left side of engine compt) Vehicle speed sensor (vss) (left side of transmission) Vss high Vss low
DEFOGGERS Defogger Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for Defogger Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 40 (utility only) (w/ heated mirrors) C222 Convenience center (under left side of dash) G201 (right side of dash) G202 (behind left side of dash) G305 (right "b" pillar) G415 (frame ground, rear of vehicle) Heated mirror relay (in underhood fuse/relay center) Heater and a/c control switch Hot in run Hot in run or start Htr-a/c fuse 12 25a I/p fuse block Left cargo door contactor Left heated mirror Left outside rear view mirror Left rear cargo door defogger grid Mirrors fuse 10a Nca Nca a Pick-up w/ extended or crew cab Rear defogger switch Rear window defogger grid Right cargo door contactor Right heated mirror Right rear cargo door defogger grid Rr-defog fuse 30a S218 S223 S251 S259 S268 S410 S425 S506 (inside power outside rear view mirror harn., 7 cm from power outside rear view mirror) Solid state time delay relay Suburban/utility w/ liftgate Suburban/utility w/o liftgate Underhood fuse/relay center
ELECTRONIC POWER STEERING Electronic Power Steering Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for Electronic Power Steering Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 37 (front top of engine) g134 (2000) (i/p harness, approximately 40 cm from instrument cluster breakout) (i/p harness, approximately 5 cm from dlc breakout) (right front of engine) g119 (right rear of engine) 5 volt ref Battery Data Data link connector (dlc) (under left side of dash, left of steering column) Diesel Electronic variable orifice (evo)/ passlock module (under center of dash) Evo feed Evo solenoid out G117 (1999) Gas Gauges fuse 4 10a Ground Hot at all times Hot in run or start I/p fuse block (under left side of dash) Ignition Pnk S213 S215 S221 S280 Security/strg fuse 21 20a Sensor return Steering assist control solenoid (part of power steering pump) Steering handwheel speed sensor (on steering column, near firewall) Steering wheel posit signal Sws posit sig Vehicle control module (on left side of engine compartment) Vehicle speed sensor buffer (behind right side of dash) Volt ref Vss sig out Vss signal input
ENGINE PERFORMANCE
5.7L 5.7L VIN R, Engine Performance Wiring Diagrams (1 of 4) for Chevrolet Cab & Chassis C1999 2500 List of elements for 5.7L VIN R, Engine Performance Wiring Diagrams (1 of 4) for Chevrolet Cab & Chassis C1999 2500: 61 (attached to right rear of throttle body) idle air control (iac) valve (behind right side of dash) (bottom front of engine near, crank pulley) crankshaft position sensor (top right side of engine) evaporative emission canister purge valve 1-2 shift sol ctrl 2-3 shift sol ctrl 3-2 shift sol ctrl A/t w/ 4wd Air pump rel ctrl Cam posit sens sig Camshaft position sensor (inside distributor) Crank posit sens sig Ect sens sig Egr posit sig Fuel gauge lvl Fuel tank press sens G119 (right front of engine block) Heated oxygen sensor (5.ol: bank 1 sensor 3, 5.7l w/ below 8600 gvw: bank 1 sensor 2, 5.7l w/ over 8600 gvw: bank 2 sensor 2) (in exhaust pipe in back of right catalytic converter) Heated oxygen sensor (bank 1 sensor 1) (in exhaust pipe in front of left catalytic converter) Heated oxygen sensor (bank 2 sensor 1) (in exhaust pipe in front of right catalytic converter) Ho2s low Ho2s sig Iat sens sig Idle air ctrl (iac) a hi Idle air ctrl (iac) b lo Ign feed Inj 1 ctrl Inj 2 ctrl Inj 3 ctrl Inj 4 ctrl Inj 5 ctrl Inj 6 ctrl Inj 7 ctrl Inj 8 ctrl Knock sens sig Knock sensor (ks) (right side of engine block, below exhaust manifold, forward of starter) Map sens input Mass air flow sens sig Nca Others Pnk Pnk c ignition feed Pnk pnk S148 S149 S162 Sens rtn Sens sig Sensor return Tan Tcc pwm sol ctrl Tcc sol ctrl Temp sens input Throttle posit sens Vehicle control module (vcm) (left side of engine compt) Vehicle speed sensor (left side of transmission, left side of transfer case w/ 4wd) Vehicle speed sensor buffer Vent ctlr Vss rtn Vss sig Vss signal 5.7L VIN R, Engine Performance Wiring Diagrams (2 of 4) for Chevrolet Cab & Chassis C1999 2500 List of elements for 5.7L VIN R, Engine Performance Wiring Diagrams (2 of 4) for Chevrolet Cab & Chassis C1999 2500: 41 2-3 red 3-2 red shift solenoid Air injection reaction (secondary) pump (on front of engine) Air injection reaction relay (underhood fuse/ relay center) Automatic transmission Aux-b fuse 30a stud-b Ecm1 fuse 20a Eng1 k7 Evaporative emissions (evap) canister vent valve (left side of engine compt) Exhaust gas recirculation (egr) valve (front of engine near thermostat housing) Fluid pressure (tfp) manual valve position switch Fluid temperature sensor Fuel inj 1 Fuel inj 2 Fuel inj 3 Fuel inj 4 Fuel inj 5 Fuel inj 6 Fuel inj 7 Fuel inj 8 Fuse 20a l8 G127 (left side of engine compt, on air injection reaction pump) Heated oxygen sensor (5.ol: bank 1 sensor 2, 5.7l w/ below 8600 gvw: bank 2 sensor 2, 5.7l w/ over 8600 gvw: bank 1 sensor 2) (in exhaust pipe in back of left catalytic converter) Hot at all times Hot in run & start Nca Pnk Pnk pnk pnk tan red Pressure control solenoid valve Red Red tcc solenoid S104 S108 S147 S161 S166 (eng harn, 18 cm from ebcm breakout) Shift solenoid Tan Torque convertor clutch pulse width modulation solenoid Under hood fuse-relay center W/4l80e 4-speed trans oly 5.7L VIN R, Engine Performance Wiring Diagrams (3 of 4) for Chevrolet Cab & Chassis C1999 2500 List of elements for 5.7L VIN R, Engine Performance Wiring Diagrams (3 of 4) for Chevrolet Cab & Chassis C1999 2500: 61 (eng harn, approx 17 cm from breakout to egr valve) s106 (eng harn, hd: 10 cm from egr valve breakout, ld: 27 cm from egr valve breakout) (engine harn, approx 16 cm from breakout to egr valve) (inside left frame rail, near rear crossmember) (inside left frame rail, near rear crossmember) g415 (right rear of cylinder head) g117 (taillamp extension harn, 6 cm from the fuel pump harn breakout) (taillamp extension harness, approx 10 cm from fuel pump balance module breakout) Automatic transmission input shaft speed sensor (left side of transmission) Balance fuel pump (on inside left frame rail, near front of rear tank) Convenience center (under left side of dash) D w/ dual fuel tanks Engine coolant temperature sensor (top right front of engine, near thermostat housing) F7 ign e fuse 10a g8 Fuel gauge input Fuel pump & sender (in fuel tank) Fuel pump balance module (inside left side of frame rail) Fuel pump balance relay (on fuel pump balance module) Fuel tank pressure sensor (in fuel tank) Fuel tanks G415 Gauges fuse 4 10a Ground Hot in off, run or start Hot in run or start I/p fuse block Ignition Instrument cluster Intake air temperature sensor (in air intake duct) M/t only Manifold absolute pressure (map) sensor (top right of engine, near fuel injectors) Mass air flow sensor (in air intake duct) Output to gauge c2 Pnk Pnk a Pnk pnk tan red Primary tank fuel lvl sig Relay ctrl S103 S213 S231 S232 S315 S318 S319 S324 S430 Secon tank fuel lvl sig Secondary fuel gauge sender (in fuel tank) Service engine soon indicator Speedometer input Tachometer input Tan a Throttle position sensor (on throttle body assembly) Trans fuse 20 10a Underhood fuse-relay center pnk Upshift lamp W/ dual fuel tank W/ dual w/o dual fuel tank W/o dual fuel tank W/o dual fuel tanks 5.7L VIN R, Engine Performance Wiring Diagrams (4 of 4) for Chevrolet Cab & Chassis C1999 2500 List of elements for 5.7L VIN R, Engine Performance Wiring Diagrams (4 of 4) for Chevrolet Cab & Chassis C1999 2500: 89 (engine harness, approx 13 cm from s150 (engine harness, approx 7 cm from ebcm breakout) (i/p harn, 20 cm from inflatable restraint switch breakout) (i/p harn, harness, 13 cm from left engine grommet) (i/p harness, approx 40 cm from instrument cluster breakout) (or (right rear of cylinder head) g120 4wd input 5v ref voltage A pnk A/c comp enable rel A/c request signal A/t Air conditioning system Air inlet vlv mtr ctlr Aux fan relay Brake sw input Brake switch input Check eng lp ctrl Clutch pedal position (cpp) switch (at top of clutch pedal) Cooling fans system Cpp sw input Cruise control module (left rear of engine compt, on firewall) Cruise ctrl sig eng Data link connector (under left side of dash, left side of steering column) Distributor Dual fuel mod return Ebcm breakout) Egr vlv feed Egr vlv ground Electronic brake control module (ebcm) (on left side of engine compt) Electronic variable orifice/ passlock control module (center of dash) Est output sig Evap can purge vlv F11 ecmb fuse 20a Force motor feed Force motor return Four whl dr sig Four whl dr sig lo Fuel level input Fuel pump a prime connector (left rear of eng compt) Fuel pump relay Fuel pump rly ctrl G117 (right rear of cylinder head) G12 Ground High voltage coil wire Hot at all times Hot in run I/p fuse block Ign coil out Ign input Ign timing sig. Ignition Ignition coil (top left rear of engine) Ignition coil driver (left rear side of engine) Ignition feed M/t M4 brake fuse 18 10a n3 Pnk Pressure switch input Radio Red S101 S103 S111 (engine harness, approx 10 cm from ebcm breakout) S151 S152 S153 S221 Sensor ground Sensor return Serial data sig Shift ind lp out Speed sensor Speed sensor input Stoplamp switch (top of brake pedal) Stoplamp/ clutch switch input Switch signal Trans input speed rtn Trans input speed sig Transfer case control module (under dash, on steering column support bracket) Transfer case switch (left top of transfer case) Transmissions system Underhood fuse- relay center Vcm sig Vehicle control module (vcm) (left side of engine compt) Vss input Vss sig out
6.5L 6.5L VIN F, Engine Performance Wiring Diagrams (2 of 4) for Chevrolet Cab & Chassis C1999 2500 List of elements for 6.5L VIN F, Engine Performance Wiring Diagrams (2 of 4) for Chevrolet Cab & Chassis C1999 2500: 37 (a/t: eng harn, approx 4 cm from i/p harness breakout, m/t: i/p harn, 20 cm from inflatable restraint i/p module switch breakout) (engine harn) (on inj pump) 5 volt ref Accelerator pedal position (app) module (part of accelerator pedal) Clutch pedal position (cpp) switch (m/t only) (top of clutch pedal bracket) Cmp sig D2 trans fuse 20 20a e1 D8 stop/haz fuse 1 20a c7 Ecm-1 h7 Electronic brake control module (on left side of engine compt) Engine shutoff solenoid (top of fuel injection pump) Fuel solenoid (rear of fuel injection pump) Fuel solenoid driver (left side of fuel injection pump) Fuse 20a High res sig Hot at all times Hot in run Hot in run or start I/p fuse block Injection timing stepper motor (top right front of engine) M4 brake fuse 18 10a n3 Nca Optical fuel temperature sensor (on top of fuel injection pump) Pnk Pnk pnk Power distribution system Red S190 S198 S220 (i/p harness, approx 6 cm from steering column breakout) S222 (m/t) s152 (a/t) S299 Sens grd Stop- lamp switch (on top of brake pedal) Tan d Underhood fuse-relay center 6.5L VIN F, Engine Performance Wiring Diagrams (3 of 4) for Chevrolet Cab & Chassis C1999 2500 List of elements for 6.5L VIN F, Engine Performance Wiring Diagrams (3 of 4) for Chevrolet Cab & Chassis C1999 2500: 38 (inside left frame rail, below driver's door) (m/t: engine harness, approx 37 cm from breakout to ebcm, a/t: engine harness, approx 31 cm from taillamp harn breakout) s100 (taillamp extension harness, approx 10 cm from fuel pump balance module breakout) (top rear of right cylinder head) (top rear of right cylinder head) g117 Ecm-b fuse 20a F11 Fuel lift pump Fuel pump prime connector (left side of eng compt) Fuel pump relay (in under fuse-relay center) Fuel pump/oil pressure switch (under intake manifold, center of engine) G117 G117 (top rear of right cylinder head) G12 Gauges fuse 4 10a Hot at all times Hot in run or start I/p fuse block Instrument cluster Instrument cluster system Instrument cluster system (fuel pump balance relay) Pnk Red S101 S103 S147 S213 S318 Service engine soon indicator Service throttle soon indicator Tan Underhood fuse-relay center Vehicle speed input W/ dual tanks W/o dual tank Wait to start "glow plugs" indicator Water in fuel indicator Water in-fuel sensor (on fuel filter/ manager) 6.5L VIN F, Engine Performance Wiring Diagrams (4 of 4) for Chevrolet Cab & Chassis C1999 2500 List of elements for 6.5L VIN F, Engine Performance Wiring Diagrams (4 of 4) for Chevrolet Cab & Chassis C1999 2500: 78 "serv eng soon" ind "serv throttle soon" ind (at air intake duct) mass air flow (maf) sensor (engine harness) (engine harness, approx 13 cm into ebcm breakout) (on fuel manager/filter) fuel heater (top rear of right cylinder head) g117 12v battery (fused) 12v battery fused 3/2 ctrl out A/c enable A/c system C10 C11 C12 C13 C14 C15 C16 D10 D11 D12 D13 D14 D15 D16 Data link connector (dlc) (under left side of dash, left of steering column) Egr sol output Egr valve sol putput Eng-i k7 Engine shutoff sol out Exhaust gas recirculation (egr) vent solenoid (top center of engine) Exhaust gas recirculation egr solenoid (top left side of engine) Fuel sol module (5 vref) Fuel sol module feed Fuse 20a Fusible link Fusible links G117 (top rear of right cylinder head) Glow plug 1 Glow plug 2 Glow plug 3 Glow plug 4 Glow plug 5 Glow plug 6 Glow plug 7 Glow plug 8 Glow plug output Glow plug relay (top left rear of engine) Grd Ground Hot at all times Hot in run or start Ign Ignition Pcm gnd Pnk Powertrain control module (pcm) (behind right side of dash, near blower motor) Red Relay ctrl S103 S108 S137 S138 S147 S150 S191 S269 (i/p harness) Serial data sig Shift sol a input Shift sol b input Signal Tan Tps 2 ref voltage Underhood fuse-relay center Wait to start ind Wastegate sol Wastegate solenoid (top left rear of engine)
7.4L 7.4L VIN J, Engine Performance Wiring Diagrams (1 of 4) for Chevrolet Cab & Chassis C1999 2500 List of elements for 7.4L VIN J, Engine Performance Wiring Diagrams (1 of 4) for Chevrolet Cab & Chassis C1999 2500: 62 (attached to right rear of throttle body) idle air control (iac) valve (bottom front of engine near, crank pulley) crankshaft position sensor (eng harn) s145 (top right side of engine) evaporative emission canister purge solenoid 1-2 shift sol ctrl 2-3 shift sol ctrl A/t w/ 4wd Air pump rel ctrl Cam posit sens sig Camshaft position sensor (inside distributor) Crank posit sens sig Ect sens sig Egr posit sig Fuel gauge lvl Fuel level input Fuel tank press sens G117 (back side of eng block, below right side of cylinder head) Heated oxygen sensor (bank 1 sensor 1) (in exhaust pipe in front of left catalytic converter) Heated oxygen sensor (bank 2 sensor 1) (in exhaust pipe in front of right catalytic converter) Heated oxygen sensor (bank 2 sensor 2) (in exhaust pipe in back of right catalytic converter) Ho2s low Ho2s sig Iat sens sig Idle air ctrl (iac) a hi Idle air ctrl (iac) b lo Ign feed Inj 1 ctrl Inj 2 ctrl Inj 3 ctrl Inj 4 ctrl Inj 5 ctrl Inj 6 ctrl Inj 7 ctrl Inj 8 ctrl Knock sens sig Knock sensor (ks) (right) (right side of engine block, below exhaust manifold) Knock sensor ks) (left) (left side of engine block, below exhaust manifold) Map sens input Mass air flow sens sig Nca Others Pnk Pnk c ignition feed Pnk pnk Pnk pnk pnk pnk S148 S149 S162 Sens rtn Sens sig Sensor return Tan Tcc pwm sol ctrl Temp sens input Throttle posit sens Vehicle control module (vcm) (left side of engine compt) Vehicle speed sensor (left side of transmission, left side of transfer case w/ 4wd) Vehicle speed sensor adapter Vent ctlr Vss rtn Vss sig Vss signal 7.4L VIN J, Engine Performance Wiring Diagrams (2 of 4) for Chevrolet Cab & Chassis C1999 2500 List of elements for 7.4L VIN J, Engine Performance Wiring Diagrams (2 of 4) for Chevrolet Cab & Chassis C1999 2500: 37 2-3 red Air injection reaction (secondary) clutch (on front of air pump) Air injection reaction relay (underhood fuse/ relay center) Automatic transmission Ecm1 fuse 20a Eng1 k7 Evaporative emissions (evap) purge solenoid vacuum switch (on top of engine) Exhaust gas recirculation (egr) valve (on top left side of eng) Fluid pressure (tfp) manual valve position switch Fluid temperature sensor Fuel inj 1 Fuel inj 2 Fuel inj 3 Fuel inj 4 Fuel inj 5 Fuel inj 6 Fuel inj 7 Fuel inj 8 Fuse 20a l8 G119 (right front side of eng block) Heated oxygen sensor (bank 1 sensor 2) (in exhaust pipe in back of left catalytic converter) Hot in run & start Nca Pnk Pnk pnk pnk pnk Pnk pnk pnk tan red Pressure control solenoid valve Red S104 S108 S147 S154 S155 Shift solenoid Tan Torque convertor clutch pulse width modulation solenoid Under hood fuse-relay center 7.4L VIN J, Engine Performance Wiring Diagrams (3 of 4) for Chevrolet Cab & Chassis C1999 2500 List of elements for 7.4L VIN J, Engine Performance Wiring Diagrams (3 of 4) for Chevrolet Cab & Chassis C1999 2500: 62 (eng harn) (eng harn, approx 4 cm from egr valve breakout) (engine harn) (inside left frame rail, near rear crossmember) (inside left frame rail, near rear crossmember) g415 (taillamp extension harn, 6 cm from fuel pump harn breakout) (taillamp extension harn, approx 10 cm from g415 breakout) (taillamp extension harness, approx 10 cm from fuel pump balance module breakout) Automatic transmission input shaft speed sensor (left side of transmission) Balance fuel pump (on inside left frame rail, near front of rear tank) Convenience center (under left side of dash) D w/ dual fuel tanks Engine coolant temperature sensor (top right front of engine, near thermostat housing) F7 ign e fuse 10a g8 Fuel gauge input Fuel pump & sender (in fuel tank) Fuel pump balance module (inside left side of frame rail) Fuel pump balance relay (on fuel pump balance module) Fuel tank pressure sensor (in fuel tank) Fuel tanks G117 (back side of eng block, below right side of cylinder head) G415 Gauges fuse 4 10a Ground Hot in off, run or start Hot in run or start I/p fuse block Ignition Instrument cluster Intake air temperature sensor (in air intake duct) Manifold absolute pressure (map) sensor (top right front of engine) Mass air flow sensor (in air intake duct) Output to gauge c2 Pnk Pnk a Pnk pnk tan red Primary tank fuel lvl sig Relay ctrl S103 S106 S146 S213 S231 S232 S315 S318 S319 S324 S430 Secon tank fuel lvl sig Secondary fuel gauge sender (in fuel tank) Service engine soon indicator Speedometer input Tachometer input Tan a Throttle position sensor (on throttle body assembly) Trans fuse 20 10a Underhood fuse-relay center W/ dual fuel tank W/ dual w/o dual fuel tank W/o dual fuel tank W/o dual fuel tanks 7.4L VIN J, Engine Performance Wiring Diagrams (4 of 4) for Chevrolet Cab & Chassis C1999 2500 List of elements for 7.4L VIN J, Engine Performance Wiring Diagrams (4 of 4) for Chevrolet Cab & Chassis C1999 2500: 88 (back side of eng block, below right side of cylinder head) (engine harness, approx 13 cm from s150 (engine harness, approx 7 cm from ebcm breakout) (i/p harn) (i/p harn, 20 cm from radio harn reakout) (i/p harness, approx 40 cm from instrument cluster breakout) (or 4wd input 5v ref voltage A/c comp enable rel A/c request signal A/t Air conditioning system Air inlet vlv mtr ctlr Aux fan relay Brake sw input Brake switch input Check eng lp ctrl Clutch pedal position (cpp) switch (at top of clutch pedal bracket) Cooling fans system Cpp sw input Cruise control module (left rear of engine compt, on firewall) Cruise ctrl sig eng Data link connector (under left side of dash, left side of steering column) Distributor Dual fuel mod return Ebcm breakout) Egr vlv feed Egr vlv ground Electronic brake control module (ebcm) (on left side of engine compt) Electronic variable orifice/ passlock control module (center of dash) Est output sig Evap can purge vlv F11 ecmb fuse 20a Force motor feed Force motor return Four whl dr sig Four whl dr sig lo Fuel level input Fuel pump a prime connector (left rear of eng compt) Fuel pump relay Fuel pump rly ctrl G117 G12 Ground High voltage coil wire Hot at all times Hot in run I/p fuse block Ign coil out Ign input Ign timing sig. Ignition Ignition coil (top left rear of engine) Ignition control module (on rear of intake manifold) Ignition feed M/t M4 brake fuse 18 10a n3 Pnk Pnk a Pressure switch input Radio Red S101 S103 S111 (engine harness, approx 7 cm from ebcm breakout) S151 S152 S153 S221 Sensor ground Sensor return Serial data sig Speed sensor Speed sensor input Stoplamp switch (top of brake pedal) Stoplamp/ clutch switch input Switch signal Trans input speed rtn Trans input speed sig Transfer case control module (under dash, on steering column support bracket) Transfer case switch (left top of transfer case) Transmissions system Underhood fuse- relay center Vcm sig Vehicle control module (vcm) (left side of engine compt) Vss input Vss sig out
EXTERIOR LIGHTS Back-up Lamps Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for Back-up Lamps Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 18 (chassis cab) a c (ex chassis cab) (left side of transmission) back-up lamp switch A c A/t G415 (left frame rail, behind bumper) Hot in run or start I/p fuse block Left back-up lamp M/t Mirrors system (automatic day/night mirror) Pnk Right back-up lamp S411 S414 Trailer tow connector Transmission range switch (left side of transmission) Turn b/u fuse 16 20a Exterior Lamps Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for Exterior Lamps Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 93 (dash harness behind left side of dash) s210 (execpt suburban/ utility) (forward lamps harn, 35 cm from wiper harn breakout) s122 (forward lamps harness, 5 cm from right headlamp breakout) s127 (front to rear body harness, near chmsl harness breakout) (license lamp harness, near license lamp toward taillamp breakout) s415 (rear lamps harn, 27 cm from trailer harness breakout) (w/ duel rear wheels) s413 (tail- lamp harness, near taillamps extension harness break- out) s412 Aux fuse 22 20a Auxiliary lead (taped to harness) Back-up lights circuit Cargo lamp Cargo lamp (2 bulbs) Cargo lamp switch Center high mount stop lamp Chmsl lamp (2 bulbs) Cruise control system Ctsy fuse 20a Fuse block G108 (left radiator support, near left headlamp) G119 (right front of engine block) G1o1 (right front side of engine compt) G201 (right side of dash) G202 (behind left side of dash) G305 (right "b" pillar) G415 (left frame rail, behind bumper) H9 turn pwr h8 haz pwr h7 flshr out g8 gnd Hazard Headlamp & panel dimmer switch Headlights system Hot at all times Hot in run, bulb test or start I/p fuse block Instru- ment cluster Interior lights system Left Left front marker lamp Left front park/ turn lamps Left spotlamp assembly (police package) Left tail/ stop/ turn lamp Left turn indic License lamp License lamps Maxi fuse 30a Nca Normal Off Park Park lps fuse 9 20a Pickup Pnk Police package (1999 only) Rear clearance lamps circuit Red Rheo- stat Right Right front marker lamp Right front park/ turn lamps Right spotlamp assembly (police package) Right tail/ stop/ turn lamp Right turn indic Roof marker lamps S107 S119 (forward lamps harn, 16 cm from wiper harn breakout) S123 S128 S204 S215 S220 (dash harn, 6 cm from column harness breakout) S242 S259 S283 (spotlamp ext harness) S299 S316 S411 S416 S419 S421 (tail/stop lamp harness, 7 cm from g415) S422 (tail/stop lamp harn, 7 cm from trailer harness breakout) S424 Stop- lamp relay (except subur- ban/ utility) Stop/ haz fuse 1 20a Stoplamp switch (top of brake pedal) Suburban/ utility Trailer tow connector Turn- b/u fuse 16 15a Turn/ hazard switch Turn/hazard flasher (on convenience center) Under- hood fuse relay center (left rear of engine compt) Under- hood fuse- relay center (left rear of engine compt) W/ dual rear wheels W/ step bumper W/o step bumper
GROUND DISTRIBUTION Ground Distribution Wiring Diagram (1 of 4) for Chevrolet Cab & Chassis C1999 2500 List of elements for Ground Distribution Wiring Diagram (1 of 4) for Chevrolet Cab & Chassis C1999 2500: 87 (i/p harness, approx 24 cm from instrument cluster breakout) (left front of intake manifold) (right front of engine) A16 Ashtray lamp Audio alarm module Automatic transfer case control module Automatic transfer case select switch Auxiliary cooling fan motor Auxiliary heater control switch (suburban/ utility) Body control module Brake trans- mission shift interlock switch C ground strap C10 Cargo lamp switch (pickup) Cigar lighter Convenience center D10 D12 D13 Data link connector Daytime running lamps module Drl/ radio override switch Fog lamp switch Front auxiliary power outlet Front windshield wiper/ washer pump motor G101 (right front side of eng compt, at wheelhousing) G101 (right front wheelhouse) G105 (right rear of engine compt) G108 (left radiator support, near left headlamp) G110 (diesel) G117 (right rear of engine) G119 (gasoline) G202 (behind left side of dash) Headlamp and panel dimmer switch Heater and a/c control switch Horn switch Hvac control module I/p compartment lamp Ignition switch Inflatable restraint i/p module enable switch Key-in warning buzzer switch (upper level) Left battery Left fog lamp Left front door jamb switch Left front park/ turn lamp Left high beam headlamp Left high/ low beam headlamp Left horn Left low beam headlamp Liftgate release switch (suburban/ utility) Low coolant level indicator module (diesel) Pickup only Police package Radio Rear stereo controller Rear window washer pump motor Rear window wiper/ washer switch (suburban/ utility) Right fog lamp Right front door jamb switch Right front park/ turn lamp Right high beam headlamp Right high/ low beam headlamp Right horn Right low beam headlamp S123 (forward lamps harness, approx 23 cm from left park/lamp breakout) S128 (forward lamps harness, approx 5 cm from right headlamp breakout) S158 (in washer pump jumper harness) S204 (i/p harness, approx 10 cm from steering column harn) S218 (i/p harness, aprrox 16 cm from dlc breakout) S298 S336 (floor console harn, approx 5 cm from crossbody in-line connector breakout) Shock sensor Spare Spot lamp Spot lamp relay To s316 (diagram 2 of 4) Transfer case control module Transfer case select switch Turn/ hazard flasher Uncoated Under- hood lamp Vehicle interface unit (upper level) W/ dual horns W/ quad headlamps W/ quad headlamps/ sport package Windshield wiper motor module Ground Distribution Wiring Diagram (2 of 4) for Chevrolet Cab & Chassis C1999 2500 List of elements for Ground Distribution Wiring Diagram (2 of 4) for Chevrolet Cab & Chassis C1999 2500: 75 (4wd harn, approx 10 cm from transfer case relay breakout) (eng harn, approx 16 cm into vehicle speed sensor breakout) (engine harness, near diode) (i/p harness, approx 8 cm from i/p cluster breakout) (illuminated vanity mirror jumper, approx 11 cm toward left illuminated vanity mirror) (oxygen sensor jumper harn, approx 7 cm from right bank oxygen sensor harn) (right front of engine block) g119 (right front of engine, near thermostat housing) 87a A/c compressor clutch A/c compressor clutch relay A/c compressor cycling switch A/c compressor pressure switch A/c low pressure switch Air injection reactor pump (7.4l only) Air pump Automatic transfer case module Brake pressure warning switch Cruise control module Data link connector Diesel E16 Electrochromic rearview mirror w/ compass Electronic brake control module Evo passlock module Except suburban/ utility From s204 (diagram 1 of 4) Front axle actuator Fuel heater Fuel pump and sender Fuel pump relay G110 (left front of engine) G119 G134 (right top center of cylinder head) G202 (left side of dash) Gasoline Glow plug relay Heated oxygen sensor (5.0l: bank 1 sensor 2, 5.7l w/ below 8600 gvw: bank 2 sensor 2, 5.7l w/ over 8600b gvw & 7.4l: bank 1 sensor 2) Heated oxygen sensor (5.0l: bank 1 sensor 3, 5.7l w/ below 8600 gvw: bank 1 sensor 2, 5.7l w/ over 8600b gvw & 7.4l: bank 2 sensor 2) Heated oxygen sensor bank 1 sensor 1 Heated oxygen sensor bank 1 sensor 2 Ignition coil module Inflatable restraint front end sensor Inflatable restraint sensing & diagnostic module Instrument cluster Left illuminated vanity mirror Low coolant level sensor Mass airflow sensor Park/ neutral position switch Right illuminated vanity mirror Roof marker lamps S103 (eng harn, 5.0l/5.7l: 8 cm from egr, 6.5l/7.4l: 12 cm from starter solenoid breakout) S107 (engine harness, 5.0l/5.7l: approx 20 cm egr, 6.5l: approx 40 cm from ebcm, 7.4l: approx 18 cm from ebcm breakout) S147 (diesel: eng harn, approx 4 cm from starter motor solenoid, gas: eng harn, approx 5 cm from egr valve breakout) S149 S156 S162 (5.0l/5.77l: eng harn, 17 cm from starter solenoid breakout, 7.4l: eng harn, approx 15 cm from right bank oxygen sensor breakout) S167 (battery harn, at left side of eng compt) S185 S186 S215 S302 S302 (4wd harn, approx 10 cm from transfer case relay breakout) S316 Starter relay Stoplamp relay Trans range switch Transfer case relay Transfer case shift switch Underhood fuse- relay center Vehicle control module Vehicle speed sensor W/o dual tanks Water in fuel sensor Water valve (suburban/ utility) Ground Distribution Wiring Diagram (3 of 4) for Chevrolet Cab & Chassis C1999 2500 List of elements for Ground Distribution Wiring Diagram (3 of 4) for Chevrolet Cab & Chassis C1999 2500: 92 (i/p harness, approx 12 cm from i/p cluster breakout) (inside left front door harness, 8 cm from tweeter speaker breakout) (left seat harn, approx 5 cm from power seat lumbar switch breakout) (right front seat harn, approx 5 cm from power seat lumbar switch breakout) (right side of dash) A/t only Audio amplifier Automatic transfer case shift control module Auxiliary power connector rear console Bench seat Body control module Cargo lamp Center high mount stop- lamp Data link connector Diesel Door lock inversion module Door lock relay Door lock switch E16 Evo passlock module Four-wheel drive indicator lamp Front blower motor Fuel gage sender Fuel pump balance module Fuel pump relay G134 (front top of engine) G201 Headlamp control module Heated mirror relay High blower motor relay Instrument cluster Interior lamp control module Left front power window switch Left front seat belt switch Left power lumbar support motor Left power seat adjuster switch Left rear heated seat element Left rear heated seat module Left rear heated seat switch Left rear power window switch Left rear seat belt switch Mass airflow sensor Mode door motor Others Pickup/ extended & crew only Power amplifier Power amplifier relay Power outside rearview mirror switch Powertrain control module Rear window lockout switch Recirculation door motor Remote control door lock receiver Right front power lumbar support motor Right front power outside rear view mirror motor Right front power seat adjuster switch Right front power seat lumbar motor Right front power window switch Right front seat belt switch Right power lumbar motor Right rear heated seat element Right rear heated seat module Right rear heated seat switch Right rear power window switch Right rear seat belt switch S103 (engine harness, approx 12 cm from starter solenoid breakout) S215 S227 S228 S244 (hvac harn, approx 8cm from recirculation door breakout) S251 (crossbody harness, approx 13cm right of left door harness breakout) S259 (crossbody harness, approx 7 cm into seat belt switch breakout) S317 (taillamp extension harness, approx 10 cm from fuel gage sender breakout) S330 (floor console harn, approx 13 cm from heated seat breakout) S337 (left rear heated seat harn) S338 (right rear heated seat harn) S500 Secondary fuel gage sender Security led Suburban only Temperature door motor Transfer case mode selector illumination lamp Under- hood fuse- relay center Upper level Vehicle speed sensor buffer W/ a/c W/ dual tanks W/ pwr wd W/ rke W/o a/c W/o pwr wd W/o rke Window defogger grid Ground Distribution Wiring Diagram (4 of 4) for Chevrolet Cab & Chassis C1999 2500 List of elements for Ground Distribution Wiring Diagram (4 of 4) for Chevrolet Cab & Chassis C1999 2500: 66 (auxiliary hvac harn, approx 7 cm from blower motor resistor breakout) (diesel) (front-to-rear body harn, appr0x 8 cm from chmsl breakout) (gas) (license lamps harness, approx 8 cm from tail- lamp harness breakout) (rear lamps harness, 17-33 cm from taillamps extension breakout) (right front seat harn, approx 5 cm from power seat lumbar switch breakout) s321 Auxiliary blower motor Auxiliary heater- a/c logic module Auxiliary mode door motor Auxiliary temp door motor Cargo door lock relay Cargo doors Center high mount stoplamp Chassis cab & heavy duty Door lock control module (w/ cargo doors) Endgate marker lamps Except chassis cab & heavy duty Front auxiliary heater-a/c control module Front dome lamp Fuel pump & sender G305 (right 'b' pillar) G415 (left frame rail, behind bumper) G416 (inside left framerail, near rear crossmember) Garage door opener In-line resistor Left cargo door defogger grid Left door contact button Left front clearance lamp Left license lamp Left rear clearance lamp Left rear tail, stop, license, turn & backup lamps Left rear tail, stop, turn & backup lamps Left tail, stop, turn & backup lamps Lift gate Liftgate release relay Nca Overhead console lamps Pickup w/ dual rear wheels Reading lamp overhead console Rear auxiliary heater-a/c control module Rear auxiliary power connector Rear dome lamp Rear door jamb switch Rear liftgate window defogger grid Rear wiper motor module Right cargo door defogger grid Right door contact button Right front clearance lamp Right license lamp Right rear clearance lamp Right rear tail, stop, license, turn & backup lamps Right rear tail, stop, turn & backup lamps Right tail, stop, turn & backup lamps S307 (rear hvac control harness, approx 10 cm from hvac logic module breakout) S319 (taillamp extension harn, approx 7cm from fuel pump and sender breakout) S403 S410 (front to rear lamps harness, 1213 cm from right rear door speaker breakout) S411 S411 (rear lamps harness, 17-33 cm from taillamps extension breakout) S416 S424 Suburban & utility Trailer ground (taped back) Upper level W/ dual tanks
HEADLIGHTS Headlight Wiring Diagram, with Quad Headlamps for Chevrolet Cab & Chassis C1999 2500 List of elements for Headlight Wiring Diagram, with Quad Headlamps for Chevrolet Cab & Chassis C1999 2500: 72 (forward lamps harn, approx 12cm from left headlamp breakout toward windshield washer pump) (i/p harn, near strng col harn breakout; except gas) (i/p harn, near auxiliary power outlet; gas) Acc Brake ind ctrl Brake warn in Bulb test Convenience center (under left side of dash) Daytime running lamps module (behind left side of dash) Daytime running lamps relay Diode 203 Drl indicator Drl relay ctrl Drl-fog fuse 15 20a Exterior lights system Fog lamp relay Fog lamp switch G101 (right front inner fender) G108 (left radiator support) G134 (right top center of cylinder head) G202 (behind left side of dash) Gages fuse 4 10a Ground Head Head- lamp dimmer switch Headlamp and panel dimmer switch High beam indicator Hot at all times Hot in run, bulb test or start I/p fuse block (left side of dash) Ignition Ignition switch Illum lamp Ind bulb chk Instrument cluster Instrument cluster system (brake warning indicator) Interior lights system Lamp feed Left fog lamp Left high beam head- lamp Left low beam head- lamp Lighting fuse 8 50a Lock Nca Off On indicator Park Park brake sig Park brake warning switch Pk lps fuse 9 20a Pnk Red Red c Right fog lamp Right high beam head- lamp Right low beam head- lamp Run S120 (forward lamps harn, near windshield washer pump breakout, toward left hdlp) S121 S123 S128 S204 S205 S210 S213 S215 S218 S225 (i/p harn, approx 12cm from radio harn breakout) S298 Start Tan Underhood fuse/relay center (left rear of engine compt) W/ fog lamps Headlight Wiring Diagram, with Sealed Beam Headlamps for Chevrolet Cab & Chassis C1999 2500 List of elements for Headlight Wiring Diagram, with Sealed Beam Headlamps for Chevrolet Cab & Chassis C1999 2500: 75 (forward lamps harn, approx 12cm from left headlamp breakout toward windshield washer pump) (high) (i/p harn, near strng col harn breakout; except gas) (i/p harn, near auxiliary power outlet; gas) (low) A (high) A (low) Acc Brake ind ctrl Brake warn in Bulb test Convenience center (under left side of dash) Daytime running lamps module (behind left side of dash) Daytime running lamps relay Diode 203 Drl indicator Drl relay ctrl Drl-fog fuse 15 20a Exterior lights system Fog lamp relay Fog lamp switch G101 (right front inner fender) G108 (left radiator support) G134 (right top center of cylinder head) G202 (behind left side of dash) Gages fuse 4 10a Ground Head Head- lamp dimmer switch Headlamp and panel dimmer switch High beam indicator Hot at all times Hot in run, bulb test or start I/p fuse block (left side of dash) Ignition Ignition switch Illum lamp Ind bulb chk Instrument cluster Instrument cluster system (brake warning indicator) Interior lights system Lamp feed Left fog lamp Left head- lamp Lighting fuse 8 50a Lock Nca Off On indicator Park Park brake sig Park brake warning switch Pk lps fuse 9 20a Pnk Red Red c Right fog lamp Right head- lamp Run S120 (forward lamps harn, near windshield washer pump breakout toward left headlamp) S121 S123 S128 S204 S205 S210 S213 S215 S218 S225 (i/p harn, approx 12cm from radio harn breakout) S298 Start Tan Tan c Underhood fuse/relay center (left rear of engine compt) W/ fog lamps
HORN Horn Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for Horn Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 27 (inside left door harness, approx 25 cm to outside mirror breakout) s124 A11 Base Body control module (in center console) C1 c9 C210 C266 Convenience center (under left side of dash) G103 (right front of engine compt, at wheelhousing) G202 (behind left side of dash, below fuse box) Horn fuse 20a Horn relay Horn slip ring Horn switch Hot at all times Left horn (front of vehicle) Luxury Remote control door lock receiver (behind center of dash) Right horn (w/ front end appearance package only) (front of vehicle) S113 S128 S204 S293 (inside left door harn, approx 25 cm to outside mirror breakout Steering wheel Underhood fuse/relay center Underhood fuse/relay center (left rear of engine compt) Vehicle interface unit receiver (under- neath right rear seat)
INSTRUMENT CLUSTER
5.7L
6.5L 6.5L VIN F, Instrument Cluster Wiring Diagram (1 of 2) for Chevrolet Cab & Chassis C1999 2500 List of elements for 6.5L VIN F, Instrument Cluster Wiring Diagram (1 of 2) for Chevrolet Cab & Chassis C1999 2500: 61 (6 bulbs) Air bag ind Anti- lock brakes ind Anti-lock brakes system Anti-theft system Bat ind Brake ind Check gauges ind Check gauges lamp driver Daytime running lamps ind Dimming led Engine controls system Engine coolant temperature sensor (on top right front of engine, near thermostat housing) Exterior lights system Fuel gauge G117 (top rear of right cylinder head) G119 (right front of engine block) G134 (front top of engine) G202 (behind left side of dash) Generator Gnd Headlights system Hi beam ind Ign Illum Illumination Instrument cluster Interior lights system Left turn ind Low coolant ind Low coolant level indicator module (behind center of dash) Low coolant level sensor (in coolant reservoir, right side of engine compt) Oil press Oil pressure switch & sender (under intake manifold, center of engine) Pnk Prndl Prndl a Prndl b Prndl c Prndl parity Right turn ind S107 S147 S215 S298 Safety belt ind Security ind Service engine soon ind Service throttle soon ind Solid state Speed- ometer Starting/charging system Tach Tan Temp gauge Transmission range switch (left side of transmission) Volt- meter Wait to start ind Warning system Water in fuel ind Water-in fuel sensor (on fuel filter/ manager) 6.5L VIN F, Instrument Cluster Wiring Diagram (2 of 2) for Chevrolet Cab & Chassis C1999 2500 List of elements for 6.5L VIN F, Instrument Cluster Wiring Diagram (2 of 2) for Chevrolet Cab & Chassis C1999 2500: 52 (i/p harn, 16 cm into cluster breakout) 4wd a/t 4wd m/t & all 2wd A/t Accy Anti-lock brakes system Brake ind Brake pressure warning switch (on rear of ebcm casting) Brake psi Daytime running lamps module (behind left side of dash, taped to panel wiring harness) Dual fuel tanks Electronic brake control module (left side of engine compt) Eng 1 mini fuse 20a Engine controls system Engine controls system (fuel pump balance relay) Fuel gage sender (in front fuel tank) Fuel pump & sender Fuel pump balance module (inside left side of frame rail) G119 (right front of engine block) G134 (front top of engine) Gauges fuse 4 10a Hot in run or start Hot in run, bulb test or start I/p fuse block (under left side of dash) Ign e mini fuse 10a Ign sw Ignition switch Lock M/t Off Park brake warning switch (on parking brake pedal bracket) Pk brake Pnk Radio Run S103 S107 S115 S211 S213 S215 S315 S317 Secondary fuel gage sender (in rear fuel tank) Single fuel tank Start Trans fuse 20 10a Twisted pair Underhood fuse/relay center (left rear of engine compt) Vehicle speed sensor (left side of transmission, left side of transfer case w/ 4wd) Vehicle speed sensor (vss) adapter Vehicle speed sensor buffer (behind right side of dash)
7.4L
INTERIOR LIGHTS Courtesy Lamps Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for Courtesy Lamps Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 70 (crossbody harn, approx 22 cm from left door harn breakout) (i/p harn, approx 6 cm from i/p compt box lamp breakout) s208 (w/ rke) Bat Braided ground strap Cargo door jamb switch (suburban/ utility only) Courtesy lamps Ctrl Ctsy fuse 3 20a Dome defeat Dome lamp defeat Door jamb Door lock control module (in front of left rear wheelwell) Front dome/ reading lamps G201 (right side of dash) G202 (behind left side of dash) G305 (right "b" pillar) Gages fuse 4 10a Gnd Headlamp & panel dimmer switch Horn fuse 20a Hot at all times Hot in run, bulb test or start I/p compart- ment box lamp I/p fuse block Ign sw Interior lamp control module (under center of dash) Lamp out Left Left front door courtesy lamp (if equipped) Left front door jamb switch Left i/p courtesy lamp Left illuminated vanity mirror Left rear door courtesy lamp (if equipped) Mirrors system Nca Overhead console lamps circuit Pnk Pnk a Pnk j Rear dome/ reading lamps (if equipped) Rear door jamb switch (if equipped) Remote control door lock receiver (behind center of dash) Right Right front door courtesy lamp (if equipped) Right front door jamb switch Right i/p courtesy lamp Right illuminated vanity mirror Right rear door courtesy lamp (if equipped) S113 S204 S209 (i/p harn, approx 13 cm from i/p compt box lamp breakout) S213 S218 S242 S246 S248 S251 S262 (crossbody harn, approx 19-25 cm from seat belt switch breakout) S312 S316 S410 S417 (4 door) (2 door) (front to rear (front to body harn, rear body approx 20 cm harn, approx into crossbody 34 cm from front harn dome lamp breakout) breakout) S426 Underhood fuse/relay center Underhood lamp W/ overhead console W/ rke W/o overhead console W/o rke Instrument Illumination Wiring Diagram (1 of 2) for Chevrolet Cab & Chassis C1999 2500 List of elements for Instrument Illumination Wiring Diagram (1 of 2) for Chevrolet Cab & Chassis C1999 2500: 52 (6) bulbs (behind left side of dash) (front to rear body harn, 5 cm from auxiliary hvac fan switch breakout) (i/p harn, near i/p cluster breakout) s217 Audio alarm module (on convenience center) Automatic transfer case control switch (luxury) c1 Automatic transfer cash select switch Auxiliary heater control switch (subur- ban/ utilitiy only) Base Cargo lamp switch (pickup only) Conven- ience center Daytime running lamp (drl)/ radio override switch Daytime running lamps (drl)/ radio override switch Display dim sig Fog lamp switch Front auxiliary hvac control lamp G131 (near thermostat housing) G201 (right side of dash) G202 G305 (at right "b" pillar) Headlamp & panel dimmer switch Hot at all times Hvac control lamp I/p fuse block Illum fuse 14 10a Illumination Inflatable restaint i/p module switch Instrument cluster Liftgate release switch (subur- ban/ utilitiy only) Luxury Off Parade mode sw Park Park lps fuse 9 20a Pickup/ extended cab only Radio Rear auxiliary hvac control lamp Rear auxiliary hvac control switch Rear window wiper/ washer switch (subur- ban/ utilitiy only) Rheo- stat S204 S215 S216 (i/p harn, near i/p cluster breakout) S218 S253 (cross- body harn, near i/p harn breakout) S259 S307 S310 Suburban & utility only Transfer case shift illumination lamp Transfer case switch Z56 only Instrument Illumination Wiring Diagram (2 of 2) for Chevrolet Cab & Chassis C1999 2500 List of elements for Instrument Illumination Wiring Diagram (2 of 2) for Chevrolet Cab & Chassis C1999 2500: 38 (behind left side of dash) (crossbody harn, approx 6 cm in left door harn breakout) (floor console harn, 12 cm from cd player harn breakout) s333 (right side of dash) Ash tray lamp Body control module (in center console) Exterior lights system G201 G202 G305 (right "b" pillar) Garage door opener lamp Headlamp & panel dimmer switch Hot at all times I/p fuse block Left front power window switch Left rear heated seat switch Left rear power window switch Off Parade mode sw Park Park lps fuse 9 20a Power outside rearview mirror switch Rear stereo controller Rear window lockout switch Rheo- stat Right front power window switch Right rear heated seat switch Right rear power window switch S210 (i/p harn, approx 12 cm from steering column harn breakout) S218 S247 S251 S259 S321 S330 S336 S500 S502 (left front door harn, near tweeter) Overhead Console Lamps Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for Overhead Console Lamps Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 23 (front to rear body harn, approx 34 cm from front dome lamp breakout) (2 door) s417 (under center of dash) (w/o rke) interior lamp control module Courtesy lamps Courtesy lamps circuit Ctsy fuse 3 20a Front dome/ reading lamps G202 (behind left side of dash) G305 (right "b" pillar) Headlamp & panel dimmer switch Hot at all times I/p fuse block Int lamp output Int lamp output c1 Overhead console reading lamps Rear dome/ reading lamps Remote control door lock receiver (w/rke) (behind center of dash) S204 S209 (i/p harn, approx 13 cm from i/p compt lamp breakout) S246 (crossbody harn, approx 22 cm from left door harn breakout) S320 S321 S410 S426
POWER DISTRIBUTION Power Distribution Wiring Diagram (1 of 6) for Chevrolet Cab & Chassis C1999 2500 List of elements for Power Distribution Wiring Diagram (1 of 6) for Chevrolet Cab & Chassis C1999 2500: 113 (auxiliary a/c harn, near blower motor relays) (crossbody harn, approx 22 cm from left door harness breakout) (diesel-eng harn, 6.5cm from ebcm breakout gasoline-eng harn, 12cm from ebcm breakout) (eng harn, approx 19cm from electronic brake control module breakout) s113 (eng harn, near ebcm breakout) (i/p harn, near steering column harness breakout) s205 (overhead console harn, between garage door opener & reading lamp) (stud a) (stud b) (vanity mirror jumper harn, approx 4 cm from inside rearview mirror) 175a 7.4l A nca A/c comp fuse 10a A/c compressor clutch relay Abs fuse 4 60a Aux fan fuse 30a Aux fuse 22 20a Aux pwr auto headlap fuse 22 20a Auxiliary cooling fan relay Auxiliary high blower motor relay Auxiliary low blower motor relay Auxiliary medium blower motor relay Auxiliary roof lamp relay Auxiliary roof lamp switch B red Blower fuse 3 50a Brake lamp relay C13 Camp/trail fuse 30a Cargo lamp switch Convenience center Ctsy fuse 3 20a D13 Daytime running lamps relay Diode Drl/fog fuse 15 20a Dual battery Ecm-b fuse 20a Electronic brake control module Evo/ passlock module Fog lamp relay Front dome lamp Front dome lamps Fuel pump oil pressure switch and sender Fuel pump relay Fusible link (10 ga-rust) Garage door opener Generator (base) Generator (uplevel) Headlamp & panel dimmer switch Headlamp and panel dimmer switch Headlamp control module Heater and a/c control switch Heater mirror relay High blower motor relay Horn fuse 20a Horn relay Htd mir fuse 10a I/p compartment box lamp I/p fuse block Instrument cluster (police package) Interior lamp control module Left battery (diesel) Left courtesy lamp Left front door courtesy lamp Left rear door courtesy lamp Left vanity mirror Lighting fuse 8 50a Mega fuse block Overhead console reading lamps Pickup only Pk lps fuse 9 20a Power outside rearview mirror switch Powertrain control module (diesel) Radio Radio batt fuse 19 10a Rear dome lamps Red Remote battery stud Right battery Right courtesy lamp Right front door courtesy lamp Right rear door courtesy lamp Right vanity mirror Rr defog fuse 30a S101 S110 S242 (i/p harn, 12cm from inflatable restraint switch breakout) S248 (crossbody harn, approx 35 cm from left front door harn breakout) S278 S312 s312 S401 S426 S443 Security/ strg fuse 21 20a Seo fuse 30a Single battery (base) Single battery (uplevel) Spare power source Spotlamp (police package) Starter motor solenoid Stop fuse 2 50a Suburban/ utility To fusible link (diagram 5 of 6) To megafuse (diagram 6 of 6) To underhood fuse-relay center (diagram 2 of 6) Underhood fuse- relay center Underhood fuse-relay center Underhood lamp Upper level Vehicle control module (gasoline) W/o rke Power Distribution Wiring Diagram (2 of 6) for Chevrolet Cab & Chassis C1999 2500 List of elements for Power Distribution Wiring Diagram (2 of 6) for Chevrolet Cab & Chassis C1999 2500: 87 (2dr w/ rke & 4dr) (crossbody harn, 20 cm from convenience center breakout) s255 (crossbody harn, approx 19 cm from conenience center) (front-to-rear body harn, approx 6 cm from convenience center breakout) (i/p harn, 12cm from steering column harness breakout) s200 (i/p harn, 4cm from auxiliary power outlet breakout) (i/p harn, 4cm from steering column harness breakout) (i/p harn, approx 10 cm into steering column harn breakout) (i/p harn, left rear of engine compartment) (power lumbar seat jumper harn, approx 13 cm from right power seat breakout) (upper level) (utility only) 30a (others) 8cm from i/p cluster breakout) s264 Audio alarm module Audio amplifier Automatic Automatic transfer case Automatic transfer case control module Aux/pwr fuse 7 25a Base Base cargo door Base cargo doors/upper level liftgate Base liftgate/ upper level cargo doors Battery fuse 7 50a Cargo door lock relay Cig ltr fuse 13 20a Cigar lighter Convenience center D14 D15 Data link connector Door lock control module Door lock relay Electric From underhood fuse-relay center (diagram 1 of 6) Front auxiliary power connector G202 (left side of dash) I/p fuse block Instrument cluster Left front door lock switch Left front power lumbar seat switch Left power seat adjuster switch Liftgate release relay Liftgate release switch Non- base Others Pickup Police package Power amplifier relay (suburban) Pwr-accy circuit breaker (regular 20a cab/extended cab) Radio Radio batt fuse 19 10a Rear auxiliary power connector Rear console auxiliary power connector Rear door lock switch Red Remote control door lock receiver Right front door lock switch Right front power lumbar seat switch Right front power seat umbar switch Right lumbar power seat switch Right power seat adjuster switch S212 S218 S236 S237 S255 S256 S272 S299 S300 S434 Stop lamp switch Stop/haz fuse 1 20a Suburban/ utility T case fuse 2 20a To seats fuse (diagram 3 of 6) Transfer case control module Turn/ hazard switch Underhood fuse-relay center Upper level Upper levle Vehicle interface unit W/ rke W/bench seat W/o rke Power Distribution Wiring Diagram (3 of 6) for Chevrolet Cab & Chassis C1999 2500 List of elements for Power Distribution Wiring Diagram (3 of 6) for Chevrolet Cab & Chassis C1999 2500: 87 (a/t) (battery harn, red (floor console harn, 33 cm heated seat switch breakout) (gas) (diesel) (i/p harn, 12cm from steering column harn breakout) pnk (i/p harn, 22 cm before radio harn breakout) s292 (i/p harn, 4 cm from steering column harn breakout) s213 (i/p harn, 8 cm from automatic transfer case module breakout) (i/p harn, approx 8 cm from steering column harn breakout) s201 (inside left front door harn at breakout to window motor regulator) (m/t) (w/o rke) (w/ rke) A j A/t Acc Air bag fuse 10 10a At left side of eng compt) s167 Audio alarm module Backup lamp switch Body control module C210 Clutch pedal position switch Convenience center Crank fuse 8 10a Cross body harn, 8cm from convenience center breakout) Daytime running lamps module Daytime running lamps relay Drl/radio override (police package) Electrochromic rearview mirror w/ compass Evo/ passlock module From ignition switch (diagram 3 of 6) From underhood o Fuse-relay center (diagram 2 0f 6) Gauges fuse 4 10a Headlamp control module Headlamp/ panel dimmer switch I/p fuse block Ign a fuse 6 40a 50a Ign b fuse 5 50a Ignition switch Inflatable restraint i/p module switch (pickup) Inflatable restraint sensing and diagnostic module Instrument cluster Interior lamp control module or remote control door lock receiver Lock Low coolant level indicator module (diesel) M/t Off Others Park/neutral position switch Pnk Pnk k Pnk s207 Power window master switch Pwr wdo circuit breaker 30a Radio Radio fuse 17 10a Rear stereo controller Rear window lockout switch (4-dr) Rear window wiper/washer switch (suburban/utility) Red Right front power window switch (2 dr & utility) Rr wiper fuse 23 25a Run S266 S290 S501 Start Starter relay To s206 (diagram 5 of 6) To s207 (diagram 3 of 6) To s285 (diagram 6 of 6) To seats fuse (diagram 5 of 6) To underhood fuse-relay center (diagram 4 of 6) Trans fuse 20 10a Trans- mission controls Transfer case control module (selectable 4wd electric shift) Transfer case select switch Turn b/u fuse 16 20a Turn signal switch Underhood fuse-relay center Upper level Vehicle interface unit Vehicle speed sensor buffer (diesel) Windshield wiper motor module Windshield wiper/ washer switch Wiper fuse 11 25a Power Distribution Wiring Diagram (4 of 6) for Chevrolet Cab & Chassis C1999 2500 List of elements for Power Distribution Wiring Diagram (4 of 6) for Chevrolet Cab & Chassis C1999 2500: 63 (eng harn, 12 cm from fuel injector breakout) (eng harn, 30cm from ebcm breakout) (eng harn, approx 12 cm from ignition coil breakout) (eng harn, approx 4 cm from i/p harn breakout) s166 (eng harn, approx 5 cm from backup lamp switch harn breakout) (eng harn, approx 8 cm from egr breakout) (eng harn, s146 (in injector harn jumper) (oxygen sensor jumper harn, approx 19cm into harn) (taillamp extension harn, approx 17 cm from fuel pump 26 cm from ebcm breakout) 5.0l, 5.7l 6.5l pnk 7.4l 7.4l w/ california emissions A/c clutch relay A/c compressor clutch relay Air intake recirculation relay (5.7l) Air relay Balance module breakout) s315 C11 C12 Camshaft position sensor Crank- shaft position sensor Diesel Ecm 1 fuse 20a Egr boost solenoid Egr linear pwm valve solenoid Egr solenoid Eng-1 fuse 20a Engine shutoff solenoid Evaporative emission canister vent Evaporative emissions canister purge solenoid valve From splice s207 k (diagram 3 of 6) Fuel heater Fuel injector Fuel pump balance module Fuel pump balance relay Fuel solenoid driver Gasoline Glow plug relay Heated oxygen sensor (5.ol: bank 1 sensor 2, 5.7l below 8600 gvw: bank 2 sensor 2, 5.7l over 8600 gvw & 7.4l: bank 1 sensor 2) Heated oxygen sensor (5.ol: bank 1 sensor 3, 5.7l below 8600 gvw: bank 1 sensor 2, 5.7l over 8600 gvw & 7.4l: bank 2 sensor 2) Heated oxygen sensor bank 1 sensor 1 Heated oxygen sensor bank 2 sensor 1 Ign e fuse 10a Ignition coil Ignition control module Mass air flow sensor Mass airflow sensor Others Pnk Powertrain control module S104 S108 S148 S154 S155 S161 S190 Underhood fuse-relay center Vehicle control module Water-in- fuel sensor Power Distribution Wiring Diagram (5 of 6) for Chevrolet Cab & Chassis C1999 2500 List of elements for Power Distribution Wiring Diagram (5 of 6) for Chevrolet Cab & Chassis C1999 2500: 85 (auxiliary a/c harn, 17cm from blower motor relays) (crossbody harn, 27 cm from left rear heated seat breakout) (crossbody harn, approx 25 cm from sdm breakout) (eng harn, 7cm from ebcm) breakout) (floor console harn, approx 28 cm from left heated switch breakout) s332 (hvac harn, approx 4 cm from recirculation door breakout) (i/p harn, 6cm from steering column harness breakout) (i/p harn, approx 7cm from inflatable restraint switch breakout) s268 (i/p harn, approx 8 cm from steering column breakout) (others) (rear hvac control harn, approx 5 cm from hvac logic module breakout) s308 (tailamp extension harn, appr0x 10 cm from breakout to ground at left side frame rail, near crossmember) (upper level) 4wd fuse 24 25a A13 Automatic transfer case control module Automatic transfer case only Automatic transfer case select switch Auxiliary battery Auxiliary battery relay (left rear of engine compt) Auxiliary heater and a/c control logic module Auxiliary heater and a/c control module (front) Auxiliary heater and a/c control module (rear) Auxiliary high blower motor relay Auxiliary low blower motor relay Auxiliary medium blower motor relay Auxiliary mode door motor Auxiliary temperature door motor Brake fuse 18 10a Convenience center Crossbody harn, 20 cm from sdm breakout) Cruise control module (gas only) Cruise control switch Cruise fuse 6 10a Diesel E10 Electronic brake control module From ignition switch (diagram 3 of 6) From underhood e fuse-relay center (diagram 3 of 6) From underhood fuse-relay center (diagram 1 of 6) Front axle actuator Front heated seats fuse 20a Fusible link G100 (left front fender) Gas, base models Gas, others models Htr-a/c fuse 12 25a Hvac control module I/p fuse block Left front heated seat module Left front heated seat switch Left rear heated seat module Left rear heated seat switch Mode door motor Rear heated seats fuse 20a Rear heater only Rear heater w/ cargo doors Rear heater w/ lift- gate Recirculation door motor Red Right front heated seat module Right front heated seat switch Right rear heated seat module Right rear heated seat switch Rr hvac fuse 5 10a S151 S206 S233 S235 S238 S243 S281 S324 S326 S400 Seats fuse 40a Spare power source Stop lamp switch Suburban utility only Temperature door motor Transfer case switch (k3500) Underhood fuse-relay center Upper level Vehicle control module (gas only) W/ rear defrost Power Distribution Wiring Diagram (6 of 6) for Chevrolet Cab & Chassis C1999 2500 List of elements for Power Distribution Wiring Diagram (6 of 6) for Chevrolet Cab & Chassis C1999 2500: 29 (battery harn, left side of engine compartment) s167 (in auxiliary power center harness) s285 (in auxiliary power center harness) s286 (in auxiliary power center harness) s287 30a 6j1 Auxiliary power center (center of dash) Cicuit breaker 15a Cicuit breaker 25a Customer installed options From pwr wdo circuit breaker (diagram 3 of 6) From right battery (diagram 1 of 6) Fuse Fuse 175a Fuse 60a Fuse b 60a Fuse block Generator Mega fuse Pnk Police package Red Relay a Relay b Right battery S168 S288 S289 Z56
POWER DOOR LOCKS Door Lock Wiring Diagram, without Crew Cab for Chevrolet Cab & Chassis C1999 2500 List of elements for Door Lock Wiring Diagram, without Crew Cab for Chevrolet Cab & Chassis C1999 2500: 18 (inside right door harness) s601 C210 Convenience center (under left side of dash) G202 (behind left side of dash) Hot at all times I/p fuse block (under left side of dash) Left front door lock motor Left front door lock switch Lock Pwr accy circuit breaker 20a Right front door lock motor Right front door lock switch S255 S500 S600 (inside right door harness) Solid state Tan Unlock Keyless Entry Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for Keyless Entry Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 84 (cross body harness, 6cm from seat belt switch breakout) (crossbody harn, near seat belt switch breakout) s262 (crossbody harn, under left side of dash) s258 (front to rear harness, near rear window harn breakout) s431 (i/p harn, 6 cm from glove box lamp breakout) (regular/extended cab) (except regular/extended cab) (utility w/ cargo doors) 1576 (or 56) 2 door 4 door 640 (or 540) Batt (b+) C210 Cargo door jamb switch Cargo door lock switch (w/ cargo doors) Cig ltr fuse 13 20a Convenience center (left side of dash) Data link connector (under left side of dash) Dome lamps Dome lmp off Door jamb sw Door lock control module (front of left rear wheelwell) Door lock relay (under center of dash, near remote control door lock receiver) Driver dr unlk G201 (behind right side of dash) G201 (right side of dash) G305 (right "b" pillar) Gauges fuse 4 10a Ground Horn ctrl Horns system Hot at all times Hot in run, bulb test or start I/p fuse block (left side of dash) Ignition Interior lamps system Left front door jamb switch Left front door lock actuator Left front door lock switch Left rear door jamb switch Left rear door lock actuator Lock Lock out Lock sig Pass drs unlk Pnk Program sig Pwr accy circuit breaker 20a 30a Rear cargo door lock actuator (cargo doors) Remote control door lock receiver (behind center of dash) Right front door jamb switch Right front door lock actuator Right front door lock switch Right rear cargo door contactor (right rear door jamb) Right rear door jamb switch Right rear door lock actuator Rr door sw Rr lftgte unlk S204 S208 S213 S218 S251 S255 S256 S257 (crossbody harness, near door lock relay harness breakout) S259 S261 (crossbody harness, 7 cm from seat belt switch harn breakout) S264 (suburban/ utility) S296 (luxury) S410 S432 (front to rear harness, near left rear speaker harness breakout) S434 Tan Trunk, tail- gate, fuel doors system Unlock Unlock out Unlock sig Utility w/ rear cargo doors Utility w/ rear liftgate W/ cargo doors W/ liftgate W/ power windows W/o power windows
POWER MIRRORS Electrochromic Mirror Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for Electrochromic Mirror Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 36 (behind left side of dash) g202 Ambient sensor (windshield side) Automatic transmission Backup lamp switch (on left side of trans- mission) Backup lamp switch (part of park/neutral position switch) (on left side center of transmission) Breakout) s278 C/m C1 f Exterior lights system Gauges fuse 4 10a Ground Headlamp sensor (mirror side) Hot in run or start I/p fuse block (under left side of dash) Inside automatic day-night mirror Left outside automatic day-night mirror Manual transmission Mirror input Mirrors switch Nca Note Off On indicator control Pnk Power distribution system Reset to daytime high reflectivity in reverse Right outside automatic day-night mirror S160 (see note) S213 S279 (crossbody harness, approx 38 cm from convenience center pnk breakout) S316 Si60: (4.3l) (engine harness, approximately 21 cm from egr valve breakout) s160: (5.0l & 5.7l) (engine harness, approximately 23 cm from ebcm breakout) s160: (6.5l) (engine harness, approximately 17 cm from ebcm breakout) s160: (7.4l) (engine harness approximately 28 cm from fuel injector breakout) Solid state T/m Temperature sensor (in engine compartment, near lower radiator support) Turn b/u fuse 16 20a Power Mirrors Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for Power Mirrors Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 21 (inside left front door harness) (inside right front door harness) (right side of dash) g201 Ctsy fuse 3 20a Down Hot at all times I/p fuse block Illum- nation lamp Interior lights system Left Left power outside rearview mirror Left/ right motor Power outside rearview mirror switch Red Right Right power outside rearview mirror S248 S251 S503 S602 Up/ down motor
POWER SEATS 6-Way Power Seat Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for 6-Way Power Seat Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 21 (regular/extended cab) (except regular extended cab) (right side of dash) Back Forward/ rearward motor Front dn Front tilt motor Front up Fwd G201 Hot at all times I/p fuse block Left power seat adjuster switch Pwr-accy circuit breaker 20a 30a Rear dn Rear tilt motor Rear up Right power seat adjuster switch S227 S228 S255 Tan Front Seat Heater Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for Front Seat Heater Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 40 (cross body harn, left side of dash, near convenience center) (left heated seat harn, near heated seat control module breakout) (not used) Batt C236 Convenience center Front heated seats fuse 20a G201 (right side of dash) Gnd Heated seat sw sig High/low sig Hot at all time Hot in run I/p fuse block Indicator lmp feed Left front heated seat module (under left front power seat) Left front heated seat switch Left front seat back element Left front seat cushion Left front seat cushion element Left front seat temper- ature sensor Off Right front heated seat module (under right front power seat) Right front heated seat switch Right front seat back element Right front seat bealt switch Right front seat cushion Right front seat cushion element Right front seat temper- ature sensor Rr hvac fuse 5 10a S227 S233 S238 S259 S273 S274 S277 S278 Sig enable Underhood fuse/relay center Lumbar Wiring Diagram, with Bucket Seat for Chevrolet Cab & Chassis C1999 2500 List of elements for Lumbar Wiring Diagram, with Bucket Seat for Chevrolet Cab & Chassis C1999 2500: 19 (w/ regular/extended cab) (except regular extended cab) C210 c Convenience center G201 (right side of dash) Hot at all times I/p fuse block Left front power lumbar seat switch Left front power lumbar support motor Left lumbar solenoid Pwr-accy circuit breaker 20a 30a Right front power lumbar seat switch Right front power lumbar support motor Right lumbar solenoid S227 S228 S237 S241 S259 Tan Lumbar Wiring Diagram, without Bucket Seat for Chevrolet Cab & Chassis C1999 2500 List of elements for Lumbar Wiring Diagram, without Bucket Seat for Chevrolet Cab & Chassis C1999 2500: 21 C210 b Cig ltr fuse 13 20a Convenience center G201 (right side of dash) Hot at all times I/p fuse block Left front power lumbar seat switch Left front power lumbar support motor Left lumbar solenoid Red Right front power lumbar seat switch Right front power lumbar support motor Right lumbar solenoid S227 S228 S256 S259 S264 (suburban utility only) Tan W/ split bench seat W/o split bench seat
POWER WINDOWS Power Window Wiring Diagram, 2 Door for Chevrolet Cab & Chassis C1999 2500 List of elements for Power Window Wiring Diagram, 2 Door for Chevrolet Cab & Chassis C1999 2500: 21 Auto window down module Convenience center (under left side of dash) Down G201 (right side of dash) Hot in run I/p fuse block (under left side of dash) Interior lights system Left front Left front window motor Left power window master switch Pwr wdo circuit breaker 30a Right front Right front window motor Right front window switch S251 S259 S266 S500 S501 Solid state Tan Power Window Wiring Diagram, 4 Door for Chevrolet Cab & Chassis C1999 2500 List of elements for Power Window Wiring Diagram, 4 Door for Chevrolet Cab & Chassis C1999 2500: 31 Convenience center (under left side of dash) Down G201 (right side of dash) Headlamp & panel dimmer switch Hot at all times Hot in run I/p fuse block (under left side of dash) Left front Left front power window master switch Left front window motor Left rear Left rear window motor Left rear window switch Pk lps fuse 20a Pwr wdo circuit breaker 30a Right front Right front window motor Right front window switch Right rear Right rear window motor Right rear window switch S247 (crossbody harn, approx 6 cm into left door harn breakout) S251 S259 S263 S500 S501 S502 (inside left front door harness, approx 4 cm from tweeter breakout) Solid state Tan Window lockout switch
SHIFT INTERLOCKS Shift Interlock Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for Shift Interlock Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 11 Automatic transmission shift lock control (btsi) solenoid (right side of steering column) G202 (behind left side of dash) Hot in run or start I/p fuse block Park/ neutral position switch (left side of transmission) Pnk S204 Transfer case control module (under dash on steering column support bracket) Turn/ hazard switch Turn/bu fuse 16 20a W/ electric shift transfer case
STARTING/CHARGING Charging Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for Charging Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 25 (generator jumper harn, near right battery) 100a b 100a/105a b 124a l 175a All others Charge indicator Fusible link (10 ga -rust) G100 (front of left front fender) G101 (right front wheelhouse) G119 (gasoline) g110 (diesel) (diesel - left front of intake manifold) (gas - front of engine) Gauges fuse 4 10a Generator Generator (w/ dual generators) Hot in run or start I/p fuse block (under left side of dash) Instrument cluster Left battery (diesel) Mega fuse block (right front of engine compt, near battery) Pnk Power distribution system Red Right battery S213 Uplevel/ enhanced Starting Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for Starting Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 36 (left rear of engine compt) underhood fuse/relay center 175a A/t Accy Bulb test Clutch pedal position switch (top of clutch pedal) Crank fuse 8 10a Diesel Except diesel (base) Except diesel (uplevel) G100 (front of left front fender) G101 (right front wheelhouse) G119 (gasoline) g110 (diesel) (gas-right front of engine diesel-left front of intake manifold) G119 (right front off engine) Hold- in coil I/p fuse block (left side of dash) Ign a fuse 6 40a Ignition switch Left battery (diesel) Lock M/t Mega fuse block (right front of engine compt, near battery) Nca Off Power distribution system Pull- in coil Red Remote battery stud Right battery Run S107 Start Starter motor Starter relay Starter solenoid Transmission range switch (left side of transmission)
SUPPLEMENTAL RESTRAINTS Supplemental Restraint Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for Supplemental Restraint Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 43 (sir harn, 35 cm from mobile communications system wiring harn breakout) (under left side of dash) data link connector (dlc) Air bag fuse 10 10a Air bag ind Bar Cluster Data line Driver high Driver low G202 (behind left side of dash) Gauges fuse 4 10a Ground Hot in run or start Hot w/ headlamp switch in park or headlamp I/p fuse block (under left side of dash) Ignition Illum fuse 14 10a Indicator lamp Inflatable restraint front end discriminating sensor (under front outside center of radiator) Inflatable restraint i/p module (right side of dash) Inflatable restraint i/p module switch (pickup only) Inflatable restraint sensing and diagnostic module (under driver's seat carpet) Inflatable restraint steering wheel module (steering wheel) Inflatable restraint steering wheel module coil Instrument Interior lights (dimmer swtch) Navigation system Pass disable Pass enable Pass high Pass low Pnk S213 (dash harn, 4 cm from steering column harn breakout) S217 (dash harn, 16 cm from instrument cluster breakout) S218 (dash harn, near 16 cm from dlc breakout) S282 Seat belt sig Sensor feed Shorting Shorting bar Solid state Tan Warning systems (seat belt switch)
TRANSMISSION
5.7L 5.7L VIN R, A/T Wiring Diagram, 4L80-E for Chevrolet Cab & Chassis C1999 2500 List of elements for 5.7L VIN R, A/T Wiring Diagram, 4L80-E for Chevrolet Cab & Chassis C1999 2500: 87 (5.7l) (7.4l) (dash harn, 20 cm from breakout to inflatable restraint sw) (engine harn, 16 cm from egr breakout) (engine harn, 6.5 cm from breakout to ebcm) (on brake pedal bracket) stoplamp switch 1-2 shift sol 1-2 shift solenoid 2-3 shift sol 2-3 shift solenoid 2wd 4wd 4wd circuit (transfer case & axle switches) 4wd low signal in 5v reference A/t iss hi in A/t iss lo in Anti-lock brakes system Automatic transmission (4l80-e) Automatic transmission input shaft speed sensor (if equipped) (on transmission) Battery in Brake fuse 18 10a Brake switch input Breakout to egr valve) Cruise control D3, d2 D4, d2 Data class ii Data link connector (under left side of dash) Ecm 1 fuse 20a Ecm b fuse 20a Ect sens input Electronic brake control module Engine controls Engine coolant temperature sensor (top right front of engine) Fluid temp sensor Front wheel lock Fuel injectors, ignition control moudule & ignition coil Fuel pump & oil press switch/ sender & fuel pump relay G120 (top of right cylinder head) Gauges fuse 4 10a Hot at all times Hot in off, run or start Hot in run Hot in run or start I/p fuse block (under left side of dash) I/p fuse block (under left side of dsah) Ignition in Inline gender adaptor Instrument cluster Malfunction indicator lamp Mil control Pcm ground Pcs sol hi out Pcs sol lo out Pnk Press ctrl solenoid Range signal "a" Range signal "b" Range signal "c" Red Rev, lo S101 S103 S150 (engine harn, 13 cm from breakout to ebcm) S151 S152 S161 s104 S213 S222 S231 Sensor ground Sensor return Tan Tcc pwm sol Tcc pwm solenoid Tcc/abs/ cruise switch Throttle position sensor (mounted to side of throttle body) Tp sens input Trans fuse 20 10a Trans range pressure switch assembly Trans temp sig in Transfer case circuit Underhood fuse/relay center (left rear of engine compt) Vehicle control module (left side of engine compt) Vehicle speed sensor (left side of transmission-2wd) (left side of transfer case-4wd) Vss hi (signal) Vss lo (ground)
6.5L 6.5L VIN F, A/T Wiring Diagram, 4L80-E for Chevrolet Cab & Chassis C1999 2500 List of elements for 6.5L VIN F, A/T Wiring Diagram, 4L80-E for Chevrolet Cab & Chassis C1999 2500: 107 (dash harn, 16 cm from cluster breakout) (engine harn, 4 cm fromt breakout to cluster) (on brake pedal bracket) stoplamp switch (top rear of right cyl head) 1-2 shift sol 1-2 shift solenoid 2-3 shift sol 2-3 shift solenoid 2wd 4wd 4wd sig A/t iss sens hi A/t iss sens in A/t iss sens lo A/t iss sensor A12 Accelerator pedal position module (part of accelerator pedal) App 1 5v ref App 1 signal in App 2 5v ref App 2 signal in App 3 5v ref App 3 signal in Automatic transmission (4l80-e) Automatic transmission input shaft speed sensor (left front of transmission) B10 B12 Battery in Brake fuse 18 10a Brake switch in C11 C12 C13 C14 C15 Class ii data D11 D12 D13 D3, d2 D4, d2 Data link connector (under left side of dash) Ecm 1 fuse 20a Ecm b fuse 20a Ect sensor in Electronic brake control module Engine controls system Engine coolant temperature sensor (near thermostat housing) Engine shutoff solenoid, fuel solenoid Exterior lights From breakout to steering column) Fuel pump & oil press switch/ sender & fuel pump relay G117 Gauges fuse 4 10a Ground Hot at all times Hot in run Hot in run or start I/p fuse block (under left side of dash) Ignition in Inline gender adaptor Instrument cluster Malfunction indicator lamp Mil control Pcm ground Pcs sol hi out Pcs sol lo out Pnk Power Powertrain control module (right side of dash near blower motor) Press ctrl solenoid Red Rev, lo S101 S103 S140 S150 (engine harn, 13 cm from breakout to ebcm) S152 S166 S170 S211 S213 S215 S299 Sensor ground Stop/haz fuse 1 20a Stoplamp switch Tan Tcc pwm sol Tcc pwm solenoid Tft sensor in Trans fluid temp sensor Trans fuse 20 20a Trans range Trans range "a" Trans range "b" Trans range "c" Trans range pressure switch assembly Transfer case circuit Turn/ hazard switch & chime module Underhood fuse/relay center (left rear of engine compt) Vehicle speed sensor (left side of transmission-2wd left side of transfer case-4wd) Vehicle speed sensor buffer (right side of dash) Vss hi (signal) Vss in Vss lo (ground) Vss out
7.4L 7.4L VIN J, A/T Wiring Diagram, 4L80-E for Chevrolet Cab & Chassis C1999 2500 List of elements for 7.4L VIN J, A/T Wiring Diagram, 4L80-E for Chevrolet Cab & Chassis C1999 2500: 87 (5.7l) (7.4l) (dash harn, 20 cm from breakout to inflatable restraint sw) (engine harn, 16 cm from egr breakout) (engine harn, 6.5 cm from breakout to ebcm) (on brake pedal bracket) stoplamp switch 1-2 shift sol 1-2 shift solenoid 2-3 shift sol 2-3 shift solenoid 2wd 4wd 4wd circuit (transfer case & axle switches) 4wd low signal in 5v reference A/t iss hi in A/t iss lo in Anti-lock brakes system Automatic transmission (4l80-e) Automatic transmission input shaft speed sensor (if equipped) (on transmission) Battery in Brake fuse 18 10a Brake switch input Breakout to egr valve) Cruise control D3, d2 D4, d2 Data class ii Data link connector (under left side of dash) Ecm 1 fuse 20a Ecm b fuse 20a Ect sens input Electronic brake control module Engine controls Engine coolant temperature sensor (top right front of engine) Fluid temp sensor Front wheel lock Fuel injectors, ignition control moudule & ignition coil Fuel pump & oil press switch/ sender & fuel pump relay G120 (top of right cylinder head) Gauges fuse 4 10a Hot at all times Hot in off, run or start Hot in run Hot in run or start I/p fuse block (under left side of dash) I/p fuse block (under left side of dsah) Ignition in Inline gender adaptor Instrument cluster Malfunction indicator lamp Mil control Pcm ground Pcs sol hi out Pcs sol lo out Pnk Press ctrl solenoid Range signal "a" Range signal "b" Range signal "c" Red Rev, lo S101 S103 S150 (engine harn, 13 cm from breakout to ebcm) S151 S152 S161 s104 S213 S222 S231 Sensor ground Sensor return Tan Tcc pwm sol Tcc pwm solenoid Tcc/abs/ cruise switch Throttle position sensor (mounted to side of throttle body) Tp sens input Trans fuse 20 10a Trans range pressure switch assembly Trans temp sig in Transfer case circuit Underhood fuse/relay center (left rear of engine compt) Vehicle control module (left side of engine compt) Vehicle speed sensor (left side of transmission-2wd) (left side of transfer case-4wd) Vss hi (signal) Vss lo (ground)
WARNING SYSTEMS Warning System Wiring Diagrams, Base for Chevrolet Cab & Chassis C1999 2500 List of elements for Warning System Wiring Diagrams, Base for Chevrolet Cab & Chassis C1999 2500: 40 (behind left side of dash) (near thermostat housing) (opens with belt buckled) Audio alarm module (on convenience center) Diesel Fasten belts out G119 G134 (front top of engine) G134 (right top center of cylinder head) G201 (right side of dash) G202 Gas Gauges fuse 4 10a Ground Hot at all times Hot in park or headlight Hot in run, bulb test, or start I/p fuse block (under left side of dash) Ignition on input Illum fuse 14 10a Instru- ment cluster Key-in warning Key-in warning buzzer switch (left side of steering column) Left front door jamb switch Lights on input Pnk Power input S103 S204 S213 S215 S217 S259 S298 S299 Safety belts indicator Seat belt input Seat belt switch (on driver's seat belt buckle) Stop/haz fuse 1 20a Tan Warning System Wiring Diagrams, Luxury & Performance for Chevrolet Cab & Chassis C1999 2500 List of elements for Warning System Wiring Diagrams, Luxury & Performance for Chevrolet Cab & Chassis C1999 2500: 46 (behind left side of dash) (near thermostat housing) (opens with belt buckled) B tan Battery input Body control module (in center console) C13 C14 Ctsy fuse 3 20a D11 D15 Distribution Drvr dr ajar sw Fasten belts out G119 G134 (right top center of cylinder head) G201 (right side of dash) G202 Gauges fuse 4 10a Ground Headlamp & panel dimmer switch Hot at all times Hot in run, or start I/p fuse block (under left side of dash) Instru- ment cluster Key-in warning Key-in warning buzzer switch (left side of steering column) Left door jamb switch Park lamp input Pklps fuse 9 20a Pnk Power S103 S204 S210 (near convenience center) S213 S215 S259 S335 S336 Safety belts indicator Seat belt input Seat belt switch (on driver's seat belt buckle) Switched ignition System Tan
WIPER/WASHER Front Wiper/Washer Wiring Diagram for Chevrolet Cab & Chassis C1999 2500 List of elements for Front Wiper/Washer Wiring Diagram for Chevrolet Cab & Chassis C1999 2500: 22 Front windshield washer pump motor G108 (left radiator support) G202 (behind left side of dash) Hot in accy or run I/p fuse block (under left side of dash) Inst wipe Low Mist Nca Off Pulse Red Red a S158 S204 Solid state Wash Washer switch Windshield wiper motor module (on firewall, behind wiper motor) Windshield wiper/ washer switch Wiper fuse 11 25a Wiper switch
