GMC Pickup C3500 (1985-2000) conven- ience center Wiring diagrams

AUDIO ALARM MODULE (ON CONVENIENCE CENTER) AUTOMATIC TRANSFER CASE CONTROL SWITCH (LUXURY) AUTOMATIC TRANSFER CASH SELECT SWITCH AUXILIARY HEATER CONTROL BASE BLK WIRE CARGO LAMP SWITCH (PICKUP ONLY) TRANSFER CASE SWITCH CONVEN- IENCE CENTER DAYTIME RUNNING LAMP (DRL)/ RADIO OVERRIDE SWITCH DAYTIME RUNNING LAMPS (DRL)/ RADIO OVERRIDE SWITCH DISPLAY DIM SIG DISPLAY DISPLAY DIM DIM SIG SIG FOG LAMP SWITCH FRONT AUXILIARY HVAC CONTROL LAMP GRN WIRE GRY WIRE HEADLAMP, PANEL DIMMER SWITCH HOT AT ALL TIMES HVAC CONTROL LAMP I/P FUSE BLOCK ILLUM FUSE 14 ILLUMINATION INFLATABLE RESTAINT I/P MODULE SWITCH INSTRUMENT CLUSTER LIFTGATE RELEASE SWITCH (SUBUR- BAN/ UTILITIY ONLY) LUXURY OFF ORG/ WIRE PARADE MODE SW PARK PARK LPS FUSE 9 PICKUP/ EXTENDED CAB ONLY PPL PPL PPL RADIO RADIO INFLATABLE RESTAINT I/P MODULE SWITCH REAR AUXILIARY HVAC CONTROL LAMP REAR AUXILIARY HVAC CONTROL SWITCH REAR WINDOW WIPER/ WASHER SWITCH RHEO- STAT SUBURBAN, UTILITY ONLY SWITCH (SUBUR- BAN/ UTILITIY ONLY) TRANSFER CASE SHIFT ILLUMINATION LAMP TRANSFER CASE SWITCH WHT WIRE

AUDIO ALARM MODULE (ON CONVENIENCE CENTER) AUTOMATIC TRANSFER CASE CONTROL SWITCH (LUXURY) AUTOMATIC TRANSFER CASH SELECT SWITCH AUXILIARY HEATER CONTROL BASE BLK WIRE CARGO LAMP SWITCH (PICKUP ONLY) TRANSFER CASE SWITCH CONVEN- IENCE CENTER DAYTIME RUNNING LAMP (DRL)/ RADIO OVERRIDE SWITCH DAYTIME RUNNING LAMPS (DRL)/ RADIO OVERRIDE SWITCH DISPLAY DIM SIG DISPLAY DISPLAY DIM DIM SIG SIG FOG LAMP SWITCH FRONT AUXILIARY HVAC CONTROL LAMP GRN WIRE GRY WIRE HEADLAMP, PANEL DIMMER SWITCH HOT AT ALL TIMES HVAC CONTROL LAMP I/P FUSE BLOCK ILLUM FUSE 14 ILLUMINATION INFLATABLE RESTAINT I/P MODULE SWITCH INSTRUMENT CLUSTER LIFTGATE RELEASE SWITCH (SUBUR- BAN/ UTILITIY ONLY) LUXURY OFF ORG/ WIRE PARADE MODE SW PARK PARK LPS FUSE 9 PICKUP/ EXTENDED CAB ONLY PPL PPL PPL RADIO RADIO INFLATABLE RESTAINT I/P MODULE SWITCH REAR AUXILIARY HVAC CONTROL LAMP REAR AUXILIARY HVAC CONTROL SWITCH REAR WINDOW WIPER/ WASHER SWITCH RHEO- STAT SUBURBAN, UTILITY ONLY SWITCH (SUBUR- BAN/ UTILITIY ONLY) TRANSFER CASE SHIFT ILLUMINATION LAMP TRANSFER CASE SWITCH WHT WIRE

ACCY ACCY BULB TEST LOCK OFF AUDIO ALARM AUXILLARY COOLING FAN RELAY BLK WIRE BLK/RED WIRE BRN WIRE BULB TEST CIGARETTE LIGHTER CIRCUIT BREAKER CLUTCH PEDAL SWITCH CONVEN- IENCE CENTER CONVENIENCE CENTER CRANK FUSE CTSY FUSE PARK LPS FUSE DAYTIME RUNNING LAMPS RELAY FUEL PUMP RELAY FUSE BLOCK FUSES FUSIBLE FUSIBLE LINK GENERATOR GLOW PLUG CONTROLLER GRY WIRE HEADLIGHT SWITCH ASSEMBLY HORN RELAY (CONVENIENCE CENTER) HTR-A/C, RR HVAC, IGNITION SWITCH LEFT BATTERY RIGHT BATTERY LINK LOCK LOCK OFF LOW BLOWER MEDIUM HIGH RELAY BLOWER BLOWER RELAY RELAY MODULE OFF ORG/ WIRE PNK WIRE POWERTRAIN FUEL CONTROL PUMP/OIL MODULE PRESSURE (PCM) SWITCH PPL PPL/ WHT WIRE PWR RADIO DOME LAMP REAR WINDOW RELEASE RELAY REAR WINDOW RELEASE SWITCH RED WIRE RR WPR, FRT WPR, RDO FUSES AND AND PWR WDO CIRCUIT BREAKER RUN WIRE STARTER MOTOR SOLENOID STOP FUSE SUBURBAN, UTILITY EXC. SUBURBAN, UTILITY SUBURBAN, UTILITY ONLY T/G REL FUSE DRL FUSE TRANS ECM-IGN, GLOW TURN B/U FUSE PLUGS, GAUGES FUSES W/ AUTO TRANS W/ AUTOMATIC TRANSMISSION WHT PPL/ WIRE YEL WIRE

ACCY AUDIO BATTERY BLK WIRE BLK/RED WIRE BRN WIRE BULB TEST CIGARETTE LIGHTER CIRCUIT BREAKER CLUTCH PEDAL SWITCH CONVEN- IENCE CENTER CONVENIENCE CENTER CRANK FUSE CTSY FUSE PARK LPS FUSE DAYTIME RUNNING LAMPS RELAY FUEL AUXILLARY PUMP COOLING RELAY FAN RELAY FUSE BLOCK FUSES FUSIBLE FUSIBLE LINK GENERATOR GRY WIRE HEADLIGHT SWITCH ASSEMBLY HIGH BLOWER RELAY HORN RELAY (CONVENIENCE CENTER) HTR-A/C, RR HVAC, IGNITION COIL IGNITION SWITCH LINK LOCK LOCK OFF LOW BLOWER MEDIUM RELAY BLOWER RELAY MODULE OFF ORG/ WIRE PNK WIRE POWERTRAIN CONTROL MODULE POWERTRAIN FUEL CONTROL PUMP/OIL MODULE PRESSURE (PCM) SWITCH PPL PPL/ WHT WIRE PWR RADIO DOME LAMP REAR (PCM) WINDOW RELEASE RELAY REAR WINDOW RELEASE SWITCH RED WIRE RR WPR, FRT WPR, RDO FUSES AND AND PWR WDO CIRCUIT BREAKER RUN WIRE STARTER MOTOR SOLENOID STOP FUSE SUBURBAN, UTILITY EXC. SUBURBAN, UTILITY SUBURBAN, UTILITY ONLY ENGINES W/ MANUAL TRANSMISSIONS ONLY T/G REL FUSE DRL FUSE TRANS, ECM-IGN, TURN B/U INJ, GAUGES FUSES FUSES VIN H&K MANUAL TRANS ONLY W/ AUTO TRANS W/ AUTOMATIC TRANSMISSION WHT PPL/ WIRE YEL WIRE

4 WHEEL DRIVE LOW SWITCH 983 474 PPL 999 998 961 452 PPL ACCELERATOR PEDAL POSITION (APP) MODULE (TOP OF ACCELERATOR BRACKET) ANTI-LOCK BRAKES SYSTEM APP 1 SENSOR APP 2 SENSOR APP 3 SENSOR BATTERY FEED BLK WIRE BLK/WHT WIRE BLK/YEL WIRE BLU/WHT WIRE BOOST SIG ECT SIG TRANS FLUID TEMP SIG BRN WIRE BRN/WHT WIRE CKP SIG OPTICAL SENS GND OPTICAL SENS CAM SIG CLUTCH PEDAL POSITION SWITCH CONVEN- IENCE CENTER CRANK FUSE CRUISE CONTROL SYSTEM CRUISE ON/OFF SIG DATA LINK CONNECTOR (UNDER LEFT SIDE OF I/P) DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE ECM-B FUSE ENGINE COOLANT TEMPERATURE (ECT) SENSOR (RIGHT SIDE OF ENGINE) ENGINE SHUT- OFF SOLENOID (TOP FRONT OF ENGINE) FUEL INJ CTRL FUEL INJ CTRL EGR SOL CTRL ENG SHUT-OFF CTRL FUEL SOL FUSE FUEL SOLENOID (TOP FRONT OF ENGINE) FUEL SOLENOID DRIVER (TOP FRONT OF ENGINE) FUSE FUSE BLOCK GLOW PLUG RLY CTRL SERIAL DATA TRANS OUTPUT SPD SIG GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES HOT IN CRANK HOT IN RUN HOT IN START OR RUN LT BLU WIRE LT GRN WIRE LT GRN/BLK WIRE OPTICAL/ FUEL TEMP SENSOR (TOP FRONT OF ENGINE) ORG/ WIRE ORG/BLK WIRE PNK WIRE PNK/WHT WIRE POWERTRAIN CONTROL MODULE (PCM) (UNDER RIGHT END OF I/P) PPL PPL 15 16 PPL/WHT WIRE RED WIRE RESUME/ACCEL SIG SET/COAST SIG SPEED SENSOR (LEFT REAR SIDE OF TRANSMISSION) SYSTEM GND CLOSURE GND APP 2 SENS GND APP 1 SENS GND APP 3 SENS GND SENSOR GND SYSTEM GND FUEL INJ SIG APP SENS 2 SIG APP SENS 1 SIG EGR CTRL/BARO SIG TAN WIRE TAN/WHT WIRE TCC BRAKE SW TRANS OUTPUT VEHICLE SPEED SENSOR BUFFER (UNDER RIGHT END OF I/P) VSS VSS HI RESOLUTION SIG VSS INPUT VSS OUTPUT WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE

4 WHEEL DRIVE LOW SWITCH 983 474 PPL 999 998 961 452 PPL ACCELERATOR PEDAL POSITION (APP) MODULE (TOP OF ACCELERATOR BRACKET) ANTI-LOCK BRAKES SYSTEM APP 1 SENSOR APP 2 SENSOR APP 3 SENSOR BATTERY FEED BLK WIRE BLK/WHT WIRE BLK/YEL WIRE BLU/WHT WIRE BOOST SIG ECT SIG TRANS FLUID TEMP SIG BRN WIRE BRN/WHT WIRE CKP SIG OPTICAL SENS GND OPTICAL SENS CAM SIG CLUTCH PEDAL POSITION SWITCH CONVEN- IENCE CENTER CRANK FUSE CRUISE CONTROL SYSTEM CRUISE ON/OFF SIG DATA LINK CONNECTOR (UNDER LEFT SIDE OF I/P) DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE ECM-B FUSE ENGINE COOLANT TEMPERATURE (ECT) SENSOR (RIGHT SIDE OF ENGINE) ENGINE SHUT- OFF SOLENOID (TOP FRONT OF ENGINE) FUEL INJ CTRL FUEL INJ CTRL EGR SOL CTRL ENG SHUT-OFF CTRL FUEL SOL FUSE FUEL SOLENOID (TOP FRONT OF ENGINE) FUEL SOLENOID DRIVER (TOP FRONT OF ENGINE) FUSE FUSE BLOCK GLOW PLUG RLY CTRL SERIAL DATA TRANS OUTPUT SPD SIG GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES HOT IN CRANK HOT IN RUN HOT IN START OR RUN LT BLU WIRE LT GRN WIRE LT GRN/BLK WIRE OPTICAL/ FUEL TEMP SENSOR (TOP FRONT OF ENGINE) ORG/ WIRE ORG/BLK WIRE PNK WIRE PNK/WHT WIRE POWERTRAIN CONTROL MODULE (PCM) (UNDER RIGHT END OF I/P) PPL PPL 15 16 PPL/WHT WIRE RED WIRE RESUME/ACCEL SIG SET/COAST SIG SPEED SENSOR (LEFT REAR SIDE OF TRANSMISSION) SYSTEM GND CLOSURE GND APP 2 SENS GND APP 1 SENS GND APP 3 SENS GND SENSOR GND SYSTEM GND FUEL INJ SIG APP SENS 2 SIG APP SENS 1 SIG EGR CTRL/BARO SIG TAN WIRE TAN/WHT WIRE TCC BRAKE SW TRANS OUTPUT VEHICLE SPEED SENSOR BUFFER (UNDER RIGHT END OF I/P) VSS VSS HI RESOLUTION SIG VSS INPUT VSS OUTPUT WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE

4 WHEEL DRIVE LOW SWITCH 983 474 PPL 999 998 961 452 PPL ACCELERATOR PEDAL POSITION (APP) MODULE (TOP OF ACCELERATOR BRACKET) ANTI-LOCK BRAKES SYSTEM APP 1 SENSOR APP 3 SENSOR APP 2 SENSOR BATTERY FEED BLK WIRE BLK/WHT WIRE BLK/YEL WIRE BLU/WHT WIRE BOOST SIG ECT SIG TRANS FLUID TEMP SIG BRN WIRE BRN/WHT WIRE CKP SIG OPTICAL SENS GND OPTICAL SENS CAM SIG CLUTCH PEDAL POSITION SWITCH CONVEN- IENCE CENTER CRK FUSE CRUISE CONTROL SYSTEM CRUISE ON/OFF SIG DATA LINK CONNECTOR (UNDER LEFT SIDE OF I/P) DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE ENGINE COOLANT TEMPERATURE (ECT) SENSOR (RIGHT SIDE OF ENGINE) ENGINE SHUT- OFF SOLENOID (TOP FRONT OF ENGINE) F/SOL FUSE FUEL INJ CTRL FUEL INJ CTRL EGR SOL CTRL ENG SHUT-OFF CTRL FUEL SOLENOID (TOP FRONT OF ENGINE) FUEL SOLENOID DRIVER (TOP FRONT OF ENGINE) FUSE FUSE BLOCK FUSIBLE LINK GLOW PLUG RLY CTRL SERIAL DATA TRANS OUTPUT SPD SIG GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES HOT IN CRANK HOT IN RUN HOT IN START OR RUN LT BLU WIRE LT GRN WIRE LT GRN/BLK WIRE OPTICAL SENSOR AND FUEL TEMPER- ATURE SENSOR (TOP FRONT OF ENGINE) ORG/ WIRE ORG/BLK WIRE PNK WIRE PNK/WHT WIRE POWERTRAIN CONTROL MODULE (PCM) (UNDER RIGHT END OF I/P) PPL PPL 15 16 PPL/WHT WIRE RED WIRE RESUME/ACCEL SIG SET/COAST SIG SPEED SENSOR (LEFT REAR SIDE OF TRANSMISSION) SYSTEM GND CLOSURE GND APP 2 SENS GND APP 1 SENS GND APP 3 SENS GND SENSOR GND SYSTEM GND FUEL INJ SIG APP SENS 2 SIG APP SENS 1 SIG EGR CTRL/BARO SIG TAN WIRE TAN/WHT WIRE TCC BRAKE SW TRANS OUTPUT VEHICLE SPEED SENSOR BUFFER (UNDER RIGHT END OF I/P) VSS VSS HI RESOLUTION SIG VSS INPUT VSS OUTPUT WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE