GMC Pickup K1500 (1985-1999) 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

A/T ONLY AUDIO AMPLIFIER AUTOMATIC TRANSFER EVO CASE SHIFT PASSLOCK CONTROL MODULE MODULE AUXILIARY POWER CONNECTOR REAR CONSOLE BLK WIRE BLK/ WHT WIRE BLK/WHT WIRE BODY CONTROL MODULE DATA LINK CONNECTOR DIESEL DOOR LOCK SWITCH FOUR-WHEEL DRIVE INDICATOR LAMP FRONT TEMPERATURE BLOWER DOOR MOTOR MOTOR FUEL GAGE SENDER FUEL PUMP RELAY HEADLAMP CONTROL MODULE HEATED MIRROR RELAY HIGH BLOWER MOTOR RELAY RIGHT REAR HEATED SEAT MODULE INSTRUMENT CLUSTER INTERIOR LAMP CONTROL MODULE LEFT CENTER REAR HIGH POWER MOUNT WINDOW STOP- SWITCH LAMP LEFT FRONT POWER WINDOW SWITCH LEFT POWER LUMBAR SUPPORT MOTOR LEFT REAR HEATED SEAT ELEMENT LEFT REAR HEATED SEAT SWITCH LEFT REAR RIGHT REAR HEATED SEAT SEAT BELT MODULE SWITCH LEFT REAR SEAT BELT SWITCH MASS AIRFLOW SENSOR MODE HIGH DOOR BLOWER MOTOR MOTOR RELAY OF LEFT DOOR HARNESS BREAKOUT) PICKUP/ EXTENDED, CREW ONLY POWER AMPLIFIER POWER AMPLIFIER RELAY POWER OUTSIDE REARVIEW MIRROR SWITCH POWERTRAIN CONTROL MODULE REAR WINDOW LOCKOUT SWITCH RECIRCULATION DOOR BREAKOUT) RECIRCULATION DOOR MOTOR REMOTE CONTROL DOOR LOCK DOOR LOCK INVERSION RECEIVER MODULE RIGHT FRONT POWER LUMBAR SUPPORT MOTOR RIGHT FRONT POWER OUTSIDE CARGO REAR VIEW LAMP MIRROR MOTOR RIGHT FRONT POWER SEAT DOOR ADJUSTER LOCK SWITCH RELAY RIGHT FRONT POWER SEAT LUMBAR MOTOR RIGHT FRONT SEAT BELT SWITCH RIGHT LEFT FRONT FRONT SEAT POWER WINDOW BELT SWITCH SWITCH RIGHT REAR HEATED SEAT ELEMENT RIGHT REAR HEATED SEAT SWITCH RIGHT REAR POWER WINDOW SWITCH SECONDARY FUEL FUEL PUMP GAGE BALANCE SENDER MODULE SECURITY LED SPEAKER BREAKOUT) LEFT POWER RIGHT SEAT POWER ADJUSTER LUMBAR SWITCH MOTOR SUBURBAN ONLY TAN/WHT WIRE TRANSFER CASE MODE SELECTOR ILLUMINATION LAMP UNDER HOOD FUSE-RELAY CENTER UPPER LEVEL UPPER LEVEL W/ RKE VEHICLE SPEED SENSOR BUFFER W/ DUAL TANKS W/ PWR WD W/O A/C W/ A/C W/O PWR WD W/O RKE WINDOW DEFOGGER GRID

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

420 1807 PPL PPL BRAKE SWITCH INPUT SERIAL DATA SIG A/C REC SW A/C REQUEST SIGNAL AIR CONDI- TIONING SYSTEM AIR CONDITIONING SYSTEM BLK WIRE BLK/WHT WIRE BLU WIRE BRAKE FUSE 18 BRAKE SW INPUT BRN WIRE BRN/WHT WIRE CLUTCH PEDAL POSITION (CPP) SWITCH (AT TOP OF CLUTCH PEDAL) COMP CYCLING SW DISTRIBUTOR DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE ECM-B MINI FUSE EST OUTPUT SIG EVO/PASSLOCK CONTROL MODULE (CENTER OF DASH) FROM I/P CLUSTER BREAKOUT) 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 FUSED OUTPUT GROUND GRY WIRE GRY/BLK WIRE HIGH VOLTAGE COIL WIRE HOT IN RUN HOT IN RUN OR START I/P FUSE BLOCK IGN INPUT IGNITION COIL (TOP RIGHT REAR OF ENGINE) IGNITION CONTROL MODULE (RIGHT SIDE REAR OF ENGINE) INPUT LT BLU/BLK WIRE LT BLU/WHT WIRE LT DATA LINK CONNECTOR (UNDER LEFT SIDE OF DASH) ORG/ WIRE PNK IGNITION FEED IGN TIMING SIG. TACH. SIG. WIRE PNK PNK WIRE PNK WIRE POWER TRANS PRESS SIG-BIT 2 TRANS PRESS SIG-BIT 1 PPL PPL (OR PPL A/T M/T PPL PPL 420 OR PRESS CTRL SOL LO VCM GROUND VCM GROUND GROUND PRESS CTRL SOL. HI RADIO RED WIRE RED/BLK WIRE SHIFT IND LP OUT EGR VALVE CNTRL SPEED SENSOR SPEED SENSOR INPUT STOPLAMP/ CLUTCH SWITCH VCM INPUT VSS INPUT SERIAL DATA INPUT STOPLAMP SWITCH (TOP OF BRAKE PEDAL) TAN/BLK WIRE TRANS PRESS SIG-BIT 3 TRANSFER CASE CONTROL MODULE (UNDER DASH ON STEERING COLUMN SUPPORT BRACKET) TRANSFER CASE SWITCH (LEFT TOP OF TRANSFER CASE) TRANSMISSIONS SYSTEM (4 WHEEL DRIVE INDICATOR CIRCUIT) UNDERHOOD FUSE-RELAY CENTER VEHICLE CONTROL MODULE (VCM) (ON LEFT SIDE OF ENGINE COMPARTMENT) VSS SIG VSS SIG CHECK ENG LP IND OUT 389 419 WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE