GMC Pickup C1500 (1985-1999) wht Wiring diagrams

4000 PULSES/MILE CRUISE STATUS BLK WIRE BLK/WHT WIRE BLU WIRE BRAKE FUSE 18 STOP/HAZ FUSE 1 BRN WIRE BRN/WHT WIRE CLUTCH PEDAL SWITCH (TOP OF CLUTCH PEDAL) CRUISE CONTROL MODULE (LEFT REAR OF ENGINE COMPARTMENT) CRUISE CONTROL SWITCH CRUISE FUSE 6 CRUISE ON INPUT SET/COAST INPUT RESUME/ACCEL INPUT CRUISE STATUS VEHICLE SPEED INPUT DISENGAGE INPUT GROUND IGNITION BRAKE APPLIED INPUT DK BLU WIRE DK GRN/WHT WIRE GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES HOT IN RUN I/P FUSE BLOCK LT BLU/BLK WIRE LT GRN/BLK WIRE M/T A/T OFF OR 379 451 ORG/ WIRE PPL PPL/WHT WIRE R/A S/C DK STOPLAMP SWITCH (TOP OF BRAKE PEDAL) VEHICLE CONTROL MODULE (VCM) (LEFT SIDE OF ENGINE COMPT) VEHICLE SPEED SENSOR (VSS) (LEFT SIDE OF TRANSMISSION) VSS RETURN VSS SIGNAL WHT WIRE

1-2 SHIFT SOL 2-3 SHIFT SOL 3-2 SHIFT SOL TRANS FLUID TEMP (TFT) SENSOR 999 998 961 452 389 995 PPL ACCELERATOR PEDAL POSITION (APP) MODULE (TOP OF ACCEL- ERATOR BRACKET) APP #3 APP #3 SENSOR SIG APP 1 APP 2 BLK WIRE BLK/WHT WIRE BLK/YEL WIRE BRN WIRE BRN/WHT WIRE DATA LINK CONNECTOR (BELOW LEFT SIDE OF DASH) DK BLU WIRE DK GRN WIRE ECM I FUSE ECM-B FUSE ENGINE COOLANT TEMPERATURE (ECT) SENSOR (LEFT LOWER FRONT OF ENGINE BLOCK) GAUGES FUSE GRY WIRE HOT AT ALL TIMES HOT IN RUN OR START HOT IN RUN, BULB TEST OR START I/P FUSE BLOCK INSTRUMENT CLUSTER LT BLU WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE ORG/ WIRE PNK IGNITION FEED 3-2 CONTROL SOL DIAGNOSTIC REQUEST WIRE PNK WIRE POWERTRAIN CONTROL MODULE (UNDER RIGHT SIDE OF DASH) PPL PPL TCC/BRAKE SW PPL/WHT WIRE PRESSURE CONTROL SOLENOID RANGE MODE SELECTOR RED WIRE RED/BLK WIRE SERVICE ENGINE SOON SPEED SENSOR (LEFT REAR SIDE OF TRANSMISSION) STOP/HAZ FUSE 1 TAN WIRE TAN/BLK WIRE TCC PWM SOL TCC SOL TCC/STOP LAMP SWITCH (ON BRAKE PEDAL SUPPORT BRACKET) TRANS FUSE 20 TRANSFER CASE SWITCH TRANSMISSION UNDERHOOD FUSE/RELAY CENTER VEHICLE SPEED SENSOR BUFFER (UNDER RIGHT END OF DASH) WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE

1-2 SHIFT SOL 1-2 SHIFT SOLENOID 2-3 SHIFT SOL 2-3 SHIFT SOLENOID A/T ISS SENS HI IN A/T ISS SENS IN A/T ISS SENS LO IN A/T ISS SENSOR OUT ACCELERATOR PEDAL POSITION MODULE (PART OF ACCELERATOR PEDAL) APP 1 SIGNAL IN APP 2 SIGNAL IN APP 3 SIGNAL IN AUTOMATIC TRANSMISSION AUTOMATIC TRANSMISSION INPUT SHAFT SPEED SENSOR (LEFT FRONT OF TRANSMISSION) BATTERY IN BLK WIRE BLK/WHT WIRE BLU/WHT WIRE BRAKE FUSE 18 BRAKE SWITCH ASSEMBLY (ON BRAKE PEDAL BRACKET) BRAKE SWITCH IN BRN WIRE BRN/WHT WIRE CLASS II DATA DK BLU WIRE DK GRN WIRE ECM-B FUSE ECT SENSOR IN ENGINE COOLANT TEMP SENSOR (NEAR THERMOSTAT HOUSING) FRONT WHEEL LOCK FUEL PUMP, OIL PRESS SWITCH/ SENDER, FUEL PUMP RELAY GAUGES FUSE 4 GROUND GRY WIRE GRY/BLK WIRE HI PPL HOT AT ALL TIMES HOT IN RUN HOT IN RUN OR START HOT IN RUN OR START UNDERHOOD FUSE/RELAY CENTER ECM 1 FUSE HOT IN RUN, BULB TEST OR START I/P FUSE BLOCK IGNITION IN INSTRUMENT CLUSTER LT BLU WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE MALFUNCTION INDICATOR LAMP MIL CONTROL ORG/ WIRE PCM GROUND PCS SOL HI OUT PCS SOL LO OUT PNK PNK WIRE PNK WIRE POWER POWERTRAIN CONTROL MODULE (RIGHT SIDE OF DASH NEAR BLOWER MOTOR) PPL PPL DATA LINK CONNECTOR (UNDER LEFT SIDE OF DASH) PPL/WHT WIRE PRESS CTRL SOLENOID LO RED WIRE RED/BLK WIRE SENSOR GROUND STOP/HAZ FUSE 1 STOPLAMP SWITCH IN TAN WIRE TAN/WHT WIRE TCC PWM SOL TCC PWM SOLENOID TFT SENSOR IN TRANS FLUID TEMP SENSOR TRANS FUSE 20 TRANS RANGE "A" TRANS RANGE "B" TRANS RANGE "C" TRANS RANGE PRESSURE SWITCH ASSEMBLY TRANS RANGE SWITCHES TRANSFER CASE CIRCUIT PNK WIRE TRANSFER CASE, AXLE SWITCHES TURN/ HAZARD SWITCH, CHIME MODULE VEHICLE SPEED SENSOR VEHICLE SPEED SENSOR (VSS) ADAPTOR VEHICLE SPEED SENSOR BUFFER (RIGHT SIDE OF DASH) VSS HI IN VSS IN VSS LO IN VSS OUT WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE

BLK WIRE CIG LTR FUSE 13 CIRCUIT BREAKER A CONVENIENCE CENTER DOOR LOCK RELAY (UNDER I/P, RIGHT SIDE OF BRAKE PEDAL BRACKET) FUSE BLOCK GRY WIRE HOT AT ALL TIMES LEFT FRONT DOOR LOCK MOTOR SOLID STATE LEFT FRONT DOOR LOCK SWITCH LEFT REAR DOOR LOCK MOTOR SOLID STATE LOCK UNLOCK LT BLU WIRE ORG/ WIRE RIGHT FRONT DOOR LOCK MOTOR SOLID STATE RIGHT FRONT DOOR LOCK SWITCH RIGHT REAR DOOR LOCK MOTOR SOLID STATE TAN WIRE UNLOCK LOCK UNLOCK RELAY LOCK RELAY WHT WIRE

BATTERY BATTERY LIFTGATE/CARGO REL BLK WIRE BLK/WHT WIRE CONVENIENCE CENTER DATA LINK CONNECTOR (UNDER LEFT SIDE OF I/P) DOOR LOCK RELAY FUSE BLOCK (LOWER LEFT SIDE OF I/P) GAUGES FUSE 4 GRY WIRE HOT AT ALL TIMES CIG LTR FUSE 14 HOT AT ALL TIMES PWR ACCY CIRCUIT BREAKER A HOT IN RUN, BULB TEST OR START KEYLESS ENTRY MODULE (BEHIND CENTER OF I/P) L FNT DR UNLK OUTPUT INT LTS INPUT GROUND LEFT FRONT DOOR LOCK MOTOR LEFT FRONT DOOR LOCK SWITCH LIFTGATE RELEASE MOTOR LOCK LOCK DOORS OUTPUT UNLK DOORS OUTPUT LT BLU WIRE ORG/ WIRE PNK IGNITION WIRE PNK WIRE PROGRAM ENABLE REAR CARGO DOOR LOCK MOTOR (UTILITY ONLY) RIGHT FRONT DOOR LOCK MOTOR RIGHT FRONT DOOR LOCK SWITCH TAN WIRE UNLOCK UTILITY W/ LIFTGATE WHT WIRE

BATTERY LIFTGATE RELEASE OUT BLK WIRE BLK/WHT WIRE CIG LTR FUSE 14 CONVENIENCE CENTER DATA LINK CONNECTOR DOOR LOCK RELAY UNLOCK FUSE BLOCK (LOWER LEFT SIDE OF I/P) GRY WIRE HOT AT ALL TIMES HOT AT ALL TIMES PWR ACCY CIRCUIT BREAKER A HOT IN RUN, BULB TEST OR START GAUGES FUSE 4 KEYLESS ENTRY MODULE (BEHIND CENTER OF I/P) L FNT DR UNLK OUT JAMB SWITCH INPUT GROUND LEFT FRONT DOOR LOCK MOTOR LEFT FRONT DOOR LOCK SWITCH LEFT REAR DOOR LOCK MOTOR LOCK LOCK DOORS OUT UNLK DOORS OUT LT BLU WIRE ORG/ WIRE PNK IGNITION WIRE PNK WIRE PROGRAM ENABLE INPUT RIGHT FRONT DOOR LOCK MOTOR RIGHT FRONT DOOR LOCK SWITCH RIGHT REAR DOOR LOCK MOTOR TAN WIRE TRUNK, TAILGATE, FUEL DOORS SYSTEM UNLOCK WHT WIRE

4.3L, 5.0L, 5.7L ONLY 5.7L W/ H/D A/T A/C COMP MINI FUSE A/C LOW PRESSURE CUTOUT SWITCH AUXILIARY FUEL COOLING CYCLE FAN CONTROL RELAY MODULE BRN WIRE CONVENIENCE CENTER ECM-B MINI FUSE ECM-I MINI FUSE EGR ELECTRONIC VACUUM REGULATOR SOLENOID ELECTRONIC HEATED SPARK OXYGEN CONTROL SENSOR MODULE ENG-I MINI FUSE EXCEPT 4.3L 5.7L H/D W/ M/T FROM AUX FAN FUSE FROM IGNITION SWITCH FROM MAXI FUSE 6 FUEL INJECTOR 1 FUEL INJECTOR 2 FUEL PUMP OIL PRESSURE SWITCH/ SENDER FUEL PUMP RELAY HIGH BLOWER RELAY HORN MINI FUSE HORN RELAY I/P FUSE BLOCK IGN E MINI FUSE LOW BLOWER RELAY M/T ONLY MAXI FUSE 3 MEDIUM BLOWER RELAY ORG/ WIRE PNK WIRE POWERTRAIN CONTROL MODULE POWERTRAIN CONTROL MODULE (PCM) RADIO RADIO FUSE 17 REAR WIPER FUSE 23 REAR WIPER/ WASHER SWITCH RED WIRE SUBURBAN ONLY SUBURBAN, UTILITY ONLY TO POWER WINDOW CIRCUIT BREAKER UNDER HOOD FUSE-RELAY CENTER UNDERHOOD FUSE-RELAY CENTER UNDERHOOD REEL LAMP WHT WIRE WIPER FUSE 11 WIPER MOTOR MODULE WIPER/ WASHER SWITCH YEL WIRE

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 RR+ RR- ANTENNA BARE BLK WIRE BRN WIRE CIG LTR FUSE 13 DIESEL GAS DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE GRY WIRE HOT AT ALL TIMES HOT IN ACC OR RUN I/P FUSE BLOCK LEFT FRONT SPEAKER LEFT FRONT TWEETER LEFT REAR DOOR SPEAKER LEFT REAR SPEAKER LR DR - RLY SIG GROUND LR DR + LR+ LR- RR DR + LT BLU WIRE LT GRN WIRE NCA WIRE ORG/ WIRE ORG/BLK WIRE PNK WIRE POWER AMPLIFIER (UNDER LEFT SIDE OF DASH) POWER AMPLIFIER RELAY (UNDER LEFT SIDE OF DASH) PPL/WHT WIRE RADIO RADIO BATT FUSE 19 RADIO FUSE 17 RED WIRE REMOTE AUDIO PLAYER RIGHT FRONT SPEAKER RIGHT FRONT TWEETER RIGHT REAR DOOR SPEAKER RIGHT REAR SPEAKER RR DR - SERIAL DATA VSS SIGNAL RR - RR + LR _ LR + TAN WIRE VEHICLE CONTROL MODULE (LEFT SIDE OF ENGINE COMPARTMENT) VEHICLE SPEED SENSOR BUFFER (BEHIND RIGHT SIDE OF DASH) VSS SIGNAL WHT WIRE YEL WIRE

A/T ACCY BLK WIRE BULB TEST CRANK FUSE 8 DIESEL EXCEPT DIESEL (BASE) EXCEPT DIESEL (UPLEVEL) HOLD- IN COIL I/P FUSE BLOCK (LEFT SIDE OF DASH, IGN A FUSE 6 IGNITION SWITCH LEFT BATTERY (DIESEL) LOCK OFF MEGA FUSE BLOCK (RIGHT FRONT OF ENGINE COMPT, NEAR BATTERY) NCA WIRE POWER DISTRIBUTION SYSTEM PPL PPL (RIGHT FRONT WHEELHOUSE) CLUTCH PEDAL POSITION SWITCH (TOP OF CLUTCH PEDAL) PPL A/T M/T PPL PPL PULL- IN COIL RED WIRE REMOTE BATTERY STUD RIGHT BATTERY RUN WIRE STARTER MOTOR STARTER RELAY STARTER SOLENOID TRANSMISSION RANGE SWITCH (LEFT SIDE OF TRANSMISSION) WHT WIRE YEL WIRE

AIR BAG FUSE 10 AIR BAG IND BLK WIRE BLK/WHT WIRE BRN WIRE DK GRN WIRE DK GRN/WHT WIRE GAUGES FUSE 4 GRY WIRE HOT IN RUN OR START HOT W/ HEADLAMP SWITCH IN PARK OR HEADLAMP I/P FUSE BLOCK (UNDER LEFT SIDE OF DASH) ILLUM FUSE 14 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 CLUSTER NAVIGATION SYSTEM (UNDER LEFT SIDE OF DASH) DATA LINK CONNECTOR (DLC) PNK INTERIOR LIGHTS (DIMMER SWTCH) WIRE PNK WIRE PPL/WHT WIRE SHORTING SHORTING BAR SHORTING BAR BAR SOLID STATE TAN WIRE TAN/BLK WIRE WARNING SYSTEMS (SEAT BELT SWITCH) WHT WIRE WHT/BLK WIRE YEL WIRE