GMC Pickup C2500 (1985-2000) fuel pump relay Wiring diagrams

BLK/WHT WIRE DATA LINK CONNECTOR DIAGNOSTIC REQUEST DIAGNOSTIC TEST FOUR-WHEEL ANTI-LOCK BRAKE MODULE (NEAR MASTER CYLINDER) FUEL PUMP FUEL PUMP PRIME FUEL PUMP RELAY GRY WIRE ORG/ WIRE POWERTRAIN CONTROL MODULE (UNDER RIGHT END OF I/P) RED WIRE SERIAL DATA TAN/WHT WIRE WHT/BLK WIRE

BLK/WHT WIRE BRAKE PRESSURE MODULATOR VALVE (NEAR BRAKE MASTER CLYINDER) DATA LINK CONNECTOR DIAGNOSTIC ENERGY RESERVE MODULE (BEHIND CENTER OF I/P) DIAGNOSTIC TEST DK BRN WIRE FUEL PUMP RELAY ORG/ WIRE POWERTRAIN CONTROL MODULE (UNDER RIGHT END OF I/P) RADIO RED WIRE REMOTE KEYLESS ENTRY MODULE (BEHIND CENTER OF I/P) SERIAL DATA TAN WIRE TAN/WHT WIRE WHT/BLK WIRE

A/C A/C HIGH COMP- PRESSURE RESSOR CUTOUT CLUTCH SWITCH # 2 A/C CONTROLLER ALL EXCEPT DRL ASH TRAY LAMPS AUDIO ALARM MODULE AUXILIARY BATTERY RELAY BLK WIRE BLK/WHT WIRE BLOWER MOTOR CENTER GLOW HIGH PLUG MOUNT CONTROL STOPLAMP MODULE RELAY CENTER HIGH MOUNT STOPLAMP (CHMSL) CIGARETTE LIGHTER ASSEMBLY CONVENIENCE CENTER CONVENIENCE DATA CENTER LINK CONNECTOR COOLANT LEVEL FUEL SENSOR HEATER CRUISE CONTROL MODULE DAYTIME RUNNING LAMPS MODULE DAYTIME RUNNING LAMPS RELAY DIESEL ENGINE ONLY DIODE EGR ELECTRONIC VACUUM FUEL REGULATOR PUMP SOLENOID AND VALVE SENDER ENGINES FOUR- WHEEL DRIVE INDICATOR FROM LEFT HIGH (OR HIGH/LOW) BEAM HEADLAMP FUEL PUMP RELAY GRA I/P COMP- ARTMENT BOX LAMP INSTRUMENT CLUSTER LEFT DOOR JAMB SWITCH LOW COOLANT WARNING LAMP MODULE MODULE NCA WIRE ORG/ WIRE PANEL DIMMER SWITCH (ASSEMBLY) PICKUP ONLY POWER LOCKS POWER WINDOWS POWER SEAT POWERTRAIN CONTROL MODULE (PCM) PUMP MOTOR RADIO REAR AUXILLIARY HEATER CONTROL REAR DEFOGGER SWITCH REAR WASHER PUMP MOTOR REAR WIPER/ WASHER SWITCH RED/WHT WIRE RIGHT DOOR JAMB SWITCH ROOF MARKER LAMPS RWAL MODULE SAFETY BELT RETRACTOR SWITCH SUBURBAN, UTILITY ONLY TAN WIRE TAN/WHT WIRE TURN FLASHER VEHICLE PARK/ SPEED NEUTRAL SENSOR POSITION BUFFER SWITCH W/ DIESEL ENGINES ONLY W/ HD AUTOMATIC TRANSMISSION WATER IN-FUEL SENSOR WHT/ BLK WIRE WIPER MOTOR AND HEATED MODULE OXYGEN (FRONT) SENSOR

BLK WIRE BLK/WHT WIRE BRN WIRE CHASSIS CAB CONVENIENCE CENTER DATA LINK CONNECTOR ENDGATE ENDGATE CLEARANCE LAMPS EVRV ELECTRONIC VACUUM REGULATOR VALVE SOLENOID FUEL PUMP FUEL PUMP RELAY HEAVY DUTY TRAILER HOT FUEL HANDLING MODULE KNOCK SENSOR MODULE LEFT CARGO DOOR DEFOGGER GRID LEFT DOOR CONTACT SWITCH LEFT FRONT CLEARANCE LAMP LEFT LICENSE LAMP LEFT REAR CENTER TAIL, STOP, HIGH LICENSE, MOUNT TURN AND STOPLAMP BACKUP LAMPS LEFT REAR CLEARANCE LAMP LEFT REAR FENDER LEFT REAR TAIL, STOP, TURN AND BACKUP LAMPS LEFT TAIL/ STOP, TURN AND BACKUP LAMP ORN/ PARK/ NEUTRAL POSITION SWITCH PICKUP (W/O DUAL REAR WHEELS), SUBURBAN AND UTILITY PICKUP WITH DUAL REAR WHEELS POWERTRAIN CONTROL MODULE (PCM) REAR DOOR W/ AUXILLIARY JAMB SWITCH HEATER, AIR CONDITIONING REAR ENDGATE LIFTGATE WINDOW WINDOW DEFOGGER RELEASE GRID SOLENOID REAR WIPER MOTOR MODULE RIGHT CARGO DOOR DEFOGGER GRID RIGHT DOOR CONTACT SWITCH RIGHT FRONT CLEARANCE LAMP RIGHT GAS STRUT CYLINDER RIGHT LEFT LICENSE LICENSE LAMP LAMP RIGHT LICENSE LAMP RIGHT REAR CLEARANCE LAMP RIGHT REAR FENDER RIGHT REAR TAIL, STOP, LICENSE, TURN AND BACKUP LAMPS RIGHT REAR TAIL, STOP, TURN AND BACKUP LAMPS RIGHT TAIL/ STOP, TURN AND BACKUP LAMP SUBURBAN, UTILITY NON-BASE VEHICLE SUBURBAN, UTILITY W/ AUTOMATIC TRANSMISSIONS SUBURBAN/ UTILITY TAN WIRE TAN/WHT WIRE TEMPER- ATURE BLOWER MODE MODE DOOR MOTOR DOOR (REAR) RELAY MOTOR TRAILER) VEHICLE SPEED SENSOR BUFFER W/ REAR AUXILLIARY HEATER ONLY W/HD AUTOMATIC TRANSMISSION) WHT WIRE WHT/ BLK WIRE WITH ENDGATE

AUDIO AMPLIFIER AUXILIARY POWER CONNECTOR REAR CONSOLE BLK WIRE BLK/ WHT WIRE BLK/WHT WIRE BODY CONTROL MODULE DATA LINK CONNECTOR DIESEL DOOR LOCK INVERSION MODULE EXCEPT PICKUP, EXT. CAB FOUR-WHEEL DRIVE INDICATOR LAMP FRONT TEMPERATURE BLOWER DOOR MOTOR MOTOR FUEL GAUGE SENDER FUEL PUMP RELAY HEADLAMP CONTROL MODULE (LUXURY) INSTRUMENT CLUSTER INTERIOR LAMP CONTROL MODULE LEFT CENTER REAR HIGH POWER MOUNT WINDOW STOP- SWITCH LAMP LEFT FRONT LEFT FRONT POWER DOOR LOCK DOOR SWITCH LOCK SWITCH LEFT POWER LUMBAR SUPPORT MOTOR LEFT POWER RIGHT SEAT SEAT ADJUSTER POWER SWITCH LUMBAR MOTOR LEFT REAR HEATED SEAT SWITCH LEFT REAR LEFT REAR SEAT BELT HEATED SEAT SWITCH ELEMENT LEFT REAR RIGHT REAR HEATED SEAT SEAT BELT MODULE SWITCH LUXURY MASS AIRFLOW SENSOR MODE HIGH DOOR BLOWER MOTOR MOTOR RELAY OF LEFT DOOR HARNESS BREAKOUT) PICKUP ONLY PICKUP/ EXTENDED, CREW ONLY POWER AMPLIFIER RELAY POWER DOOR LOCKS ONLY PICKUP, EXT. CAB POWER WINDOW LEFT MASTER SWITCH FRONT POWER DOOR LOCK SWITCH POWER WINDOW MASTER SWITCH POWERTRAIN CONTROL MODULE REAR WINDOW DEFOGGER GRID (CREW CAB) REAR WINDOW LOCKOUT SWITCH (EXCEPT 2-DR UTILITY) RECIRCULATION DOOR BREAKOUT) RIGHT FRONT POWER LUMBAR RIGHT SUPPORT FRONT MOTOR POWER SEAT ADJUSTER SWITCH RIGHT FRONT POWER SEAT LUMBAR MOTOR RIGHT FRONT SEAT DOOR BELT LOCK SWITCH RELAY RIGHT LEFT FRONT FRONT SEAT POWER WINDOW BELT SWITCH SWITCH RIGHT REAR HEATED SEAT SWITCH RIGHT REAR POWER WINDOW SWITCH SECONDARY FUEL FUEL PUMP GAGE BALANCE SENDER MODULE SECURITY LED TAN/WHT WIRE TRANSFER EVO CASE SHIFT PASSLOCK CONTROL MODULE MODULE UNDER- HOOD FUSE BLOCK VEHICLE SPEED SENSOR BUFFER W/ DUAL TANKS W/ RKE W/O A/C W/ A/C W/O RKE

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

& CRUISE FUSES A/T M/T AUX FAN MINI FUSE AUXILIARY COOLING FAN RELAY BLK WIRE BLK/RED WIRE BRAKE LAMP RELAY BRAKE PRESSURE MODULATOR VALVE BRN WIRE CRANK FUSE 8 DIAGNOSTIC ENERGY RESERVE MODULE FUEL PUMP RELAY FUSIBLE HEATER-A/C CONTROL I/P FUSE BLOCK IGNITION SWITCH INSTRUMENT CLUSTER LEFT RIGHT BATTERY BATTERY LINK LOCK LOCK OFF MAXI FUSE MAXI FUSE 2 MAXI FUSE 4 MAXI FUSE 5 MAXI FUSE 6 MAXI FUSE 7 MAXI FUSE 8 NCA WIRE OFF ORG/ WIRE PNK WIRE PPL RED WIRE REMOTE BATTERY STUD RR-DEFOG MINI FUSE RUN WIRE STARTER GENERATOR MOTOR SOLENOID TO BLOWER RELAYS TO CTSY, PK LPS, DRL/FOG FUSES, HEAD- LAMP SWITCH TO ECM-B, HORN, A/C COMP FUSES TO GAUGES, AIR BAG FUSES TO HTR-A/C, TO IGN-E, ECM-I, ENG-1 FUSES TO RADIO/ BATT, CIG LTR, AUX PWR FUSES, PWR ACCY BREAKER TO WIPER, RADIO, REAR WIPER FUSES TRANS FUSE 20 TRANS- MISSION TRANSMISSION CLUTCH RANGE SWITCH SWITCH UNDERHOOD FUSE-RELAY CENTER WHT WIRE YEL WIRE

A/C COMP MINI FUSE A/C LOW PRESSURE CUTOUT SWITCH AUXILIARY COOLING FAN RELAY BRN WIRE CONVENIENCE CENTER ECM-B MINI FUSE ECM-I MINI FUSE ELECTRONIC INJECTION PUMP ENG-I MINI FUSE FROM AUX FAN FUSE FROM IGNITION SWITCH FROM MAXI FUSE 6 FUEL PUMP OIL PRESSURE SWITCH/ SENDER FUEL PUMP RELAY FUEL SOL MINI FUSE GLOW PLUG RELAY HIGH BLOWER RELAY HORN MINI FUSE HORN RELAY I/P FUSE BLOCK IGN E MINI FUSE LOW BLOWER RELAY MAXI FUSE 3 MEDIUM BLOWER RELAY ORG/ WIRE PNK WIRE 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 WATER EGR IN FUEL SOLENOID SENSOR VALVE WHT WIRE WIPER FUSE 11 WIPER MOTOR MODULE WIPER/ WASHER SWITCH YEL 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

A/C REQUEST SIGNAL AIR CONDITIONING SYSTEM AIR INLET VLV MTR CTLR BLK WIRE BLK/WHT WIRE BLU WIRE BLU/WHT WIRE BRAKE FUSE 18 BRN WIRE BRN/WHT WIRE CLUTCH PEDAL POSITION (CPP) SWITCH (AT TOP OF CLUTCH PEDAL) CPP SW INPUT FOUR WHL DR SIG LO CRUISE CTRL SIG ENG 23 24 CRUISE CONTROL MODULE (LEFT REAR OF ENGINE COMPARTMENT, ON FIREWALL) DATA LINK CONNECTOR (UNDER LEFT SIDE OF DASH) DISTRIBUTOR DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE ELECTRONIC BRAKE CONTROL MODULE (EBCM) (ON LEFT SIDE OF ENGINE COMPARTMENT) EVO/PASSLOCK STEERING CONTROL MODULE (CENTER OF DASH) FORCE MOTOR FEED TRANS INPUT SPEED RTN TRANS INPUT SPEED SIG EST OUTPUT SIG FORCE MOTOR RETURN GROUND GROUND SENSOR GROUND FUEL LEVEL INPUT SWITCH SIGNAL FUEL PUMP PRIME CONNECTOR FUEL PUMP RELAY FUEL PUMP RLY CTRL 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 GRN WIRE GROUND GRY WIRE GRY/BLK WIRE HIGH VOLTAGE COIL WIRE HOT AT ALL TIMES UNDERHOOD FUSE- RELAY CENTER ECMB FUSE HOT IN RUN I/P FUSE BLOCK IGN BRAKE INPUT INPUT INPUT DATA SW SIG INPUT IGNITION IGNITION COIL (TOP LEFT REAR OF ENGINE) IGNITION COIL DRIVER (LEFT REAR SIDE OF ENGINE) IGNITION FEED IGN TIMING SIG. IGN COIL OUT IGNITION PRESSURE SWITCH INPUT PRESSURE SWITCH INPUT LT BLU/BLK WIRE LT BLU/WHT WIRE LT VSS SERIAL ORG/ WIRE PNK IGNITION FOUR WHL DR SIG EGR VLV GROUND WIRE PNK PNK PNK WIRE PNK WIRE PPL PPL (OR PPL A/T M/T PPL PPL PPL PPL 420 OR PPL/WHT WIRE PRESSURE SWITCH INPUT RADIO RED WIRE RED/BLK WIRE SENSOR RETURN SHIFT IND LP OUT EGR VLV FEED SPEED SENSOR SPEED STOPLAMP/ VCM SENSOR CLUTCH SIG INPUT SWITCH INPUT STOPLAMP SWITCH (TOP OF BRAKE PEDAL) SWITCH SIGNAL TAN/BLK WIRE TRANSFER CASE CONTROL MODULE (UNDER DASH ON STEERING COLUMN SUPPORT BRACKET) TRANSFER CASE SWITCH (LEFT TOP OF TRANSFER CASE) TRANSMISSIONS SYSTEM (FOUR WHEEL DRIVE INDICATOR CIRCUIT UNDERHOOD FUSE-RELAY CENTER VEHICLE CONTROL MODULE (VCM) (LEFT SIDE OF ENGINE COMPT) VSS SIG OUT VSS SIG OUT CHECK ENG LP CTRL 389 419 WHT WIRE WHT/BLK WIRE