GMC Pickup C1500 (1985-1999) tan Wiring diagrams

A/T ONLY ABS FUSE ABS IND. BLK WIRE BLK/WHT WIRE BRAKE FUSE 18 BRAKE IND BRAKE PRESSURE WARNING SWITCH BRN WIRE DAYTIME RUNNING LAMPS MODULE (BEHIND LEFT SIDE OF DASH) DIODE 1 (UNDERHOOD FUSE/RELAY CENTER) DK GRN WIRE ELECTRONIC BRAKE CONTROL MODULE (LEFT SIDE OF ENGINE COMPT) FRONT AXLE ACTUATOR (RIGHT FRONT OF DRIVE AXLE) HOT AT ALL TIMES HOT IN RUN HOT IN RUN OR START GAUGES FUSE 4 I/P FUSE BLOCK IGN ABS LAMP CONTROL BRAKE SW INPUT INPUT INSTRUMENT CLUSTER LEFT FRONT WHEEL SPEED SENSOR LFT FRT SENSOR (-) LT BLU WIRE LT GRN WIRE PNK WIRE PPL PPL PPL PUMP MOTOR POWER PUMP MOTOR GROUND RED WIRE RIGHT FRONT WHEEL SPEED SENSOR RT FRT SENSOR (-) LFT FRT SENSOR (+) RT FRT SENSOR (+) TAN WIRE TAN/WHT WIRE TCC/ STOPLAMP SWITCH (TOP OF BRAKE PEDAL) UNDERHOOD FUSE-RELAY CENTER VEHICLE SPEED SENSOR BUFFER (BEHIND RIGHT SIDE OF DASH) VSS SIG OUT VSS SIG SERIAL DATA LINE SERIAL DATA SIGNAL BRAKE LAMP CONTROL EBCM GROUND YEL WIRE YEL/BLK WIRE

AUTOMATIC TRANSFER CASE CONTROL MODULE (BEHIND LEFT SIDE OF DASH) AUX PWR FUSE 7 BLK WIRE BLK/WHT WIRE DATA LINK CONNECTOR (DLC) (UNDER LEFT SIDE OF DASH, LEFT OF STEERING COLUMN) DIAG ENABLE DIESEL GASOLINE DK GRN WIRE ELECTRONIC BRAKE CONTROL MODULE (EBCM) (ON LEFT SIDE OF ENGINE COMPT) EXCEPT LUXURY HOT AT ALL TIMES I/P FUSE BLOCK INFLATABLE RESTRAINT SENSING, DIAGNOSTIC MODULE (UNDER DRIVER'S SEAT CARPET) ORG/ WIRE PPL PPL DATA CLSS 2 PROG ENABLE RADIO REMOTE CONTROL DOOR LOCK RECEIVER (BEHIND CENTER OF DASH) SERIAL DATA TAN WIRE TAN/WHT WIRE UART DATA VEHICLE CONTROL MODULE (VCM) (ON LEFT SIDE OF ENGINE COMPT) VEHICLE INTERFACE UNIT

1-2 SHIFT SOL CTRL TCC PWM SOL CTRL INJ 1 CTRL INJ 6 CTRL EGR POSIT INPUT 2-3 SHIFT SOL CTRL 3-2 CTRL SOL. CTRL BANK 1 SENSOR 1 (IN EXHAUST PIPE, NEAR CATALYTIC CONVERTER) BANK 1 SENSOR 2 (IN EXHAUST PIPE, NEAR CATALYTIC CONVERTER) BANK 2 SENSOR 1 (IN EXHAUST PIPE, NEAR CATALYTIC CONVERTER) BLK WIRE BLK/WHT WIRE BLU WIRE BRN WIRE BRN/WHT WIRE CAM POSIT SENS RTN FUEL LVL OUTPUT TCC ON/OFF SOL CTRL PPL CAM POSIT SENS SIG CAMSHAFT POSITION SENSOR (INSIDE DISTRIBUTOR) DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE DK PNK WIRE GRN WIRE HALL EFFECT SENSOR HEATED OXYGEN IDLE AIR CTRL (IAC) A HI IDLE AIR CTRL (IAC) A HI INJ 2 CTRL INJ 3 CTRL IGN FEED KNOCK SENS SIG KNOCK SENSOR (ON REAR OF ENGINE BLOCK) LT BLU/BLK WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE LT GRN/WHT WIRE LT LT LT PPL MAP SENS INPUT IAT SENS SIG ECT SENS INPUT THROTTLE POSIT SENS EVAP 472 410 NCA WIRE PNK 32 33 WIRE PNK PNK PNK PNK 5 6 7 8 WIRE PNK PNK PNK PPL 1 2 3 4 WIRE PNK WIRE PNK/BLK WIRE PPL PPL CRANK POSIT SENS SIG VSS RTN VSS SIGNAL CRANK POSIT SENS RTN PPL PNK WIRE PPL/WHT WIRE PURGE VALVE SENS RTN SENS SIG TAN WIRE TAN/BLK WIRE TAN/WHT WIRE VEHICLE CONTROL MODULE (VCM) (ON LEFT SIDE OF ENGINE COMPARTMENT) VEHICLE SPD OUTPUT SIG VEHICLE SPEED SENSOR (LEFT SIDE OF TRANSMISSION, LEFT SIDE OF TRANSFER CASE VEHICLE SPEED SENSOR SHIELD WHT WIRE YEL WIRE YEL/BLK WIRE

1-2 SHIFT SOL 20 21 22 23 24 PNK WIRE AUTOMATIC TRANSMISSION BANK 1 SENSOR 3 (IN EXHAUST PIPE, NEAR CATALYTIC CONVERTER) BLK WIRE BLK/WHT WIRE BLU WIRE BRN WIRE DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE ECM 1 FUSE ENG 1 FUSE FUEL INJ 1 FUEL INJ 3 FUEL INJ 2 FUEL INJ 4 FUEL INJ 5 FUEL INJ 6 NO.6 GRY WIRE HEATED OXYGEN HOT IN RUN, START LT BLU WIRE LT BLU/BLK WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE LT PNK PNK WIRE NCA WIRE NOTE: FUEL INJECTORS ARE LOCATED IN THE TOP OF ENGINE, IN INTAKE MANIFOLD PNK 32 33 WIRE PNK PNK 1 2 WIRE PNK PNK PNK PNK 5 6 7 8 WIRE PNK PNK PNK PNK PNK PNK PNK WIRE PNK PNK PNK PPL 1 2 3 4 WIRE PNK WIRE PNK/BLK WIRE PPL PNK PNK WIRE PPL PNK WIRE PPL/WHT WIRE PRESSURE CONTROL SOLENOID VALVE RED WIRE RED/BLK WIRE TAN WIRE TAN/BLK WIRE TAN/WHT WIRE TCC ON/OFF SOL 2-3 SHIFT SOL TCC PWM SOL 3-2 CONTROL SOL TRANSMISSION FLUID TEMPERATURE (TFT) SENSOR (INTERNAL) UNDER HOOD FUSE-RELAY CENTER WHT WIRE YEL WIRE YEL/BLK WIRE

16 PPL 20 21 22 23 24 PNK WIRE BLK WIRE BLK/WHT WIRE BLU WIRE BRN WIRE BRN/WHT WIRE CONVENIENCE CENTER DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE FUEL PUMP AND SENDER (IN FUEL TANK) GAUGES FUSE 4 GRN WIRE GRY WIRE HOT IN OFF, RUN OR START HOT IN RUN OR START I/P FUSE BLOCK INPUT FUEL LVL INPUT OIL GAUGE INPUT TACHOMETER INSTRUMENT CLUSTER INTAKE AIR TEMP SENSOR (IN AIR INTAKE DUCT) LT BLU/WHT WIRE LT GRN WIRE M/T ONLY MAP REF LO MASS AIR FLOW SENSOR (MAF) (IN AIR INTAKE DUCT) ORG/ WIRE PNK PNK 1 2 WIRE PNK PNK WIRE PNK WIRE PPL PNK PNK WIRE RED WIRE RED/BLK WIRE REF LO TEMP REF THROTTLE POSITION (TP) SENSOR (ON THROTTLE BODY ASSEMBLY) SERVICE ENGINE SOON INDICATOR SPEEDOMETER INPUT TAN WIRE TAN/BLK WIRE TRANS FUSE 20 UPSHIFT LAMP WHT WIRE YEL WIRE YEL/BLK WIRE

11 12 PPL 2-3 SHIFT SOL CTRL 3-2 SHIFT SOL CTRL AIR PUMP REL CTRL VSS SIG BLK WIRE BLK/WHT WIRE BLU WIRE BRN WIRE BRN/WHT WIRE CAM POSIT SENS SIG CAMSHAFT POSITION SENSOR (INSIDE DISTRIBUTOR) DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE DK PNK WIRE GRN WIRE IGN SENS SENS FEED SIG RTN KNOCK SENS SIG LT BLU/BLK WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE LT GRN/WHT WIRE LT LT LT PPL NCA WIRE PNK IGNITION FEED WIRE PNK OTHERS WIRE PNK PNK 1 2 WIRE PNK PNK PNK PNK 3 4 5 6 7 WIRE PNK PPL WIRE PNK WIRE PNK/BLK WIRE PPL PPL PNK WIRE PPL SENSOR RETURN VSS RTN VSS SIGNAL CRANK POSIT SENS SIG PPL/WHT WIRE RED/BLK WIRE SENS RTN FUEL GAUGE LVL TCC SOL CTRL PPL SENSOR RETURN SENSOR SIGNAL TAN WIRE TAN/BLK WIRE TAN/WHT WIRE VEHICLE CONTROL MODULE (VCM) (LEFT SIDE OF ENGINE COMPT) VEHICLE SPEED SENSOR BUFFER VENT CTLR WHT WIRE YEL WIRE YEL/BLK WIRE

1-2 SHIFT SOL LT 2-3 SHIFT SOLENOID 3-2 SHIFT SOLENOID TCC SOLENOID PRESSURE CONTROL SOLENOID VALVE 4-SPEED TRANS OLY 6 7 8 9 10 PNK WIRE AIR INJECTION AIR INJECTION REACTION RELAY (UNDERHOOD FUSE/ RELAY CENTER) AUTOMATIC TRANSMISSION AUX-B FUSE BLK WIRE BLK/WHT WIRE BLU WIRE BRN WIRE DK (ENG HARN, 18 CM FROM EBCM BREAKOUT) DK BLU WIRE DK BLU/WHT WIRE DK GRN/WHT WIRE EVAPORATIVE EMISSIONS (EVAP) CANISTER VENT VALVE (LEFT SIDE OF ENGINE COMPT) EXHAUST GAS RECIRCULATION (EGR) VALVE (FRONT OF ENGINE NEAR THERMOSTAT HOUSING) FLUID TEMPERATURE SENSOR TORQUE CONVERTOR CLUTCH PULSE WIDTH MODULATION SOLENOID FUEL INJ 1 FUEL INJ 2 FUEL INJ 3 FUEL INJ 4 FUEL INJ 5 FUEL INJ 6 FUEL INJ 7 FUSE GRN WIRE GRY WIRE HOT AT ALL TIMES HOT IN RUN, START LT BLU WIRE LT BLU/BLK WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE LT PNK WIRE NCA WIRE ORG/ WIRE PNK FUEL INJ 8 WIRE PNK PNK PNK 1 2 3 4 5 WIRE PNK PNK PNK PNK 3 4 5 6 7 WIRE PNK PNK PNK PNK PNK WIRE PNK PNK WIRE PNK WIRE PNK/BLK WIRE PPL PPL LT PPL PNK WIRE PPL/WHT WIRE RED WIRE RED/BLK WIRE TAN WIRE TAN/BLK WIRE TAN/WHT WIRE UNDER HOOD FUSE-RELAY CENTER WHT WIRE YEL WIRE YEL/BLK WIRE

16 PPL 6 7 8 9 10 PNK WIRE AUTOMATIC TRANSMISSION INPUT SHAFT SPEED SENSOR (LEFT SIDE OF TRANSMISSION) BALANCE FUEL PUMP (ON INSIDE LEFT FRAME RAIL NEAR FRONT OF REAR TANK) BLK (OR WIRE BLK WIRE BLK/WHT WIRE BLU WIRE BLU/WHT WIRE BRN WIRE BRN/WHT WIRE CONVENIENCE CENTER (UNDER LEFT SIDE OF DASH) DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE FUEL GAUGE FUEL PUMP BALANCE MODULE (INSIDE LEFT SIDE OF FRAME RAIL) FUEL PUMP BALANCE RELAY (ON FUEL PUMP BALANCE MODULE) FUEL PUMP, SENDER (IN FUEL TANK) FUEL TANK PRESSURE SENSOR (IN FUEL TANK) GAUGES FUSE 4 GRN WIRE GROUND GRY WIRE HOT IN OFF, RUN OR START HOT IN RUN OR START I/P FUSE BLOCK IGN E FUSE INPUT INSTRUMENT CLUSTER INTAKE AIR TEMPERATURE SENSOR (IN AIR INTAKE DUCT) LT BLU WIRE LT BLU/WHT WIRE LT GRN WIRE M/T ONLY MASS AIR FLOW SENSOR (IN AIR INTAKE DUCT) OUTPUT TO GAUGE PNK (TAILLAMP EXTENSION HARN, 6 CM FROM THE FUEL PUMP HARN BREAKOUT) WIRE PNK IGNITION WIRE PNK PNK PNK WIRE PNK WIRE PPL PPL/WHT WIRE PRIMARY TANK FUEL LVL SIG RED WIRE RED/BLK WIRE RELAY CTRL SECON TANK FUEL LVL SIG SECONDARY FUEL GAUGE SENDER (IN FUEL TANK) SERVICE ENGINE SOON INDICATOR SPEEDOMETER TACHOMETER TAN WIRE TAN/BLK WIRE THROTTLE POSITION SENSOR (ON THROTTLE BODY ASSEMBLY) TRANS FUSE 20 UNDERHOOD FUSE-RELAY CENTER UPSHIFT LAMP W/ DUAL FUEL TANK W/O DUAL FUEL TANK W/ DUAL FUEL TANKS W/O DUAL FUEL TANK W/O DUAL FUEL TANK W/ DUAL FUEL TANKS W/O DUAL FUEL TANKS W/ DUAL FUEL TANK WHT (OR WIRE WHT WIRE YEL WIRE YEL/BLK WIRE

11 12 PPL 2-3 SHIFT SOL CTRL 3-2 SHIFT SOL CTRL AIR PUMP REL CTRL VSS SIG BLK WIRE BLK/WHT WIRE BLU WIRE BRN WIRE BRN/WHT WIRE CAM POSIT SENS SIG CAMSHAFT POSITION SENSOR (INSIDE DISTRIBUTOR) DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE DK PNK WIRE GRN WIRE IGN SENS SENS FEED SIG RTN KNOCK SENS SIG LT BLU/BLK WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE LT GRN/WHT WIRE LT LT LT PPL NCA WIRE PNK IGNITION FEED WIRE PNK OTHERS WIRE PNK PNK 1 2 WIRE PNK PNK PNK PNK 3 4 5 6 7 WIRE PNK PPL WIRE PNK WIRE PNK/BLK WIRE PPL PPL PNK WIRE PPL SENSOR RETURN VSS RTN VSS SIGNAL CRANK POSIT SENS SIG PPL/WHT WIRE RED/BLK WIRE SENS RTN FUEL GAUGE LVL TCC SOL CTRL PPL SENSOR RETURN SENSOR SIGNAL TAN WIRE TAN/BLK WIRE TAN/WHT WIRE VEHICLE CONTROL MODULE (VCM) (LEFT SIDE OF ENGINE COMPT) VEHICLE SPEED SENSOR BUFFER VENT CTLR WHT WIRE YEL WIRE YEL/BLK WIRE

1-2 SHIFT SOL LT 2-3 SHIFT SOLENOID 3-2 SHIFT SOLENOID TCC SOLENOID PRESSURE CONTROL SOLENOID VALVE 4-SPEED TRANS OLY 6 7 8 9 10 PNK WIRE AIR INJECTION AIR INJECTION REACTION RELAY (UNDERHOOD FUSE/ RELAY CENTER) AUTOMATIC TRANSMISSION AUX-B FUSE BLK WIRE BLK/WHT WIRE BLU WIRE BRN WIRE DK (ENG HARN, 18 CM FROM EBCM BREAKOUT) DK BLU WIRE DK BLU/WHT WIRE DK GRN/WHT WIRE EVAPORATIVE EMISSIONS (EVAP) CANISTER VENT VALVE (LEFT SIDE OF ENGINE COMPT) EXHAUST GAS RECIRCULATION (EGR) VALVE (FRONT OF ENGINE NEAR THERMOSTAT HOUSING) FLUID TEMPERATURE SENSOR TORQUE CONVERTOR CLUTCH PULSE WIDTH MODULATION SOLENOID FUEL INJ 1 FUEL INJ 2 FUEL INJ 3 FUEL INJ 4 FUEL INJ 5 FUEL INJ 6 FUEL INJ 7 FUSE GRN WIRE GRY WIRE HOT AT ALL TIMES HOT IN RUN, START LT BLU WIRE LT BLU/BLK WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE LT PNK WIRE NCA WIRE ORG/ WIRE PNK FUEL INJ 8 WIRE PNK PNK PNK 1 2 3 4 5 WIRE PNK PNK PNK PNK 3 4 5 6 7 WIRE PNK PNK PNK PNK PNK WIRE PNK PNK WIRE PNK WIRE PNK/BLK WIRE PPL PPL LT PPL PNK WIRE PPL/WHT WIRE RED WIRE RED/BLK WIRE TAN WIRE TAN/BLK WIRE TAN/WHT WIRE UNDER HOOD FUSE-RELAY CENTER WHT WIRE YEL WIRE YEL/BLK WIRE