GMC Pickup C3500 (1985-2000) dk grn Wiring diagrams

BLK WIRE BLK/WHT WIRE BRN WIRE CLUTCH SWITCH CONVENIENCE CENTER CRUISE CONTROL BRAKE SWITCH CRUISE CONTROL MODULE (LEFT REAR SIDE OF ENGINE COMPARTMENT) CRUISE CONTROL SWITCH CRUISE INPUT (4.3L VIN Z, 5.7L, 5.7L HD CRUISE ON INPUT S/C SIGNAL R/A SIGNAL CRUISE RELEASE GROUND DK BLU WIRE DK GRN WIRE FUSE BLOCK GAUGES FUSE GRY WIRE HOT AT ALL TIMES STOP FUSE HOT IN RUN BRAKE FUSE HOT IN RUN, BULB TEST OR START HOT IN RUN, BULB TEST OR START ECM-IGN FUSE INSTRUMENT PANEL LT GRN WIRE N/0 (AT TOP OF BRAKE PEDAL) NCA WIRE OFF ON R/A ORG/ WIRE PNK WIRE PNK/ POWER DISTRI- BUTION SYSTEM WIRE PNK/BLK WIRE POWERTRAIN CONTROL MODULE (PCM) (BEHIND RIGHT SIDE OF PPL RED/WHT WIRE S/C SOLID STATE TAN WIRE TCC/ STOPLAMP SWITCH VEHICLE SPEED SENSOR VEHICLE SPEED SENSOR BUFFER (BEHIND UPPER RIGHT SIDE OF INSTRUMENT PANEL) WHT WIRE WITH MANUAL TRANSAXLE WITHOUT MANUAL TRANSAXLE YEL WIRE

BLK WIRE BLK/WHT WIRE BRN WIRE CLUTCH SWITCH CONVENIENCE CENTER CRUISE CONTROL BRAKE SWITCH CRUISE CONTROL MODULE (LEFT REAR SIDE OF ENGINE COMPARTMENT) CRUISE CONTROL SWITCH CRUISE INPUT (4.3L VIN Z, 5.7L, 5.7L HD CRUISE ON INPUT S/C SIGNAL R/A SIGNAL CRUISE RELEASE GROUND DK BLU WIRE DK GRN WIRE FUSE BLOCK GAUGES FUSE GRY WIRE HOT AT ALL TIMES STOP FUSE HOT IN RUN BRAKE FUSE HOT IN RUN, BULB TEST OR START HOT IN RUN, BULB TEST OR START ECM-IGN FUSE INSTRUMENT PANEL LT GRN WIRE N/0 (AT TOP OF BRAKE PEDAL) NCA WIRE OFF ON R/A ORG/ WIRE PNK WIRE PNK/ POWER DISTRI- BUTION SYSTEM WIRE PNK/BLK WIRE POWERTRAIN CONTROL MODULE (PCM) (BEHIND RIGHT SIDE OF PPL RED/WHT WIRE S/C SOLID STATE TAN WIRE TCC/ STOPLAMP SWITCH VEHICLE SPEED SENSOR VEHICLE SPEED SENSOR BUFFER (BEHIND UPPER RIGHT SIDE OF INSTRUMENT PANEL) WHT WIRE WITH MANUAL TRANSAXLE WITHOUT MANUAL TRANSAXLE YEL WIRE

A/T PPL PPL M/T ANTILOCK BRAKE SYSTEM BRAKE FUSE 18 BRN WIRE BRN/WHT WIRE CLUTCH PEDAL POSITION SWITCH (TOP OF CLUTCH PEDAL) CRUISE CONTROL SWITCH CRUISE FUSE 6 CRUISE ON INPUT DK BLU WIRE DK GRN WIRE ENGINE CONTROL SYSTEM VSS INPUT GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES HOT IN RUN I/P FUSE BLOCK (UNDER LEFT SIDE OF DASH) LT GRN/BLK WIRE OFF ON (OR PNK) WIRE ORG/ WIRE PPL PPL/WHT WIRE R/A RESUME/ACCEL SIG S/C SET/COAST SIG STOP/HAZ FUSE 1 STOPLAMP SWITCH (TOP OF BRAKE PEDAL) STOPLAMP SWITCH INPUT VEHICLE SPEED SENSOR (VSS) (LEFT SIDE OF TRANSMISSION) VSS LOW VSS OUTPUT VSS HIGH WHT WIRE

ANTI-LOCK IND BATT GROUND BLK WIRE BRAKE IND BRAKE PRESSURE BRAKE WARN IND BROUND BRN WIRE CRUISE CONTROL SYSTEM CYLINDER DATA LINK CONNECTOR DAYTIME RUNNING LIGHTS MODULE (UNDER LEFT SIDE OF I/P) DIODE (BEHIND LEFT SIDE OF I/P) DIODE (BEHIND LEFT SIDE OF I/P) DK GRN WIRE FUSE BLOCK FUSIBLE LINK (16 GA- HOT AT ALL TIMES HOT IN RUN BRAKE FUSE HOT IN START OR RUN GAGES FUSE ECM-IGN FUSE IGN FEED ABS IND BRAKE SW IGNITION SWITCH INSTRUMENT CLUSTER LEFT FNT SENS LO RT FNT SENS LO LEFT FRONT WHEEL SENSOR LT BLU WIRE PARK BRAKE SWITCH (ON PARK BRAKE ASSEMBLY) PNK/BLK WIRE PPL PPL PPL RED WIRE RIGHT FRONT WHEEL SENSOR RT FNT SENS HI LEFT FNT SENS HI TAN WIRE TAN/WHT WIRE TCC BRAKE SWITCH (ON BRAKE PEDAL SUPPORT ARM) VSS BUFFER INPUT DLC WARNING LAMP WARNING (ON MASTER BRAKE WHT WIRE YEL WIRE

ANTI-LOCK IND BATT GROUND BLK WIRE BRAKE IND BRAKE PRESSURE BRAKE WARN IND BROUND BRN WIRE CRUISE CONTROL SYSTEM CYLINDER DATA LINK CONNECTOR DIODE (LEFT SIDE COWL) TRUNK, TAILGATE SYSTEM (LIFTGATE WINDOW RELEASE RELAY) DK GRN WIRE FUSE BLOCK FUSIBLE LINK (16 GA- HOT AT ALL TIMES HOT IN RUN BRAKE FUSE HOT IN START OR RUN GAGES FUSE ECM-IGN FUSE IGN FEED ABS IND BRAKE SW INSTRUMENT CLUSTER LEFT FNT SENS LO RT FNT SENS LO LEFT FRONT WHEEL SENSOR LT BLU WIRE PARK BRAKE SWITCH (ON PARK BRAKE ASSEMBLY) PNK/BLK WIRE PPL PPL PPL RED WIRE RIGHT FRONT WHEEL SENSOR RT FNT SENS HI LEFT FNT SENS HI TAN WIRE TAN/WHT WIRE TCC BRAKE SWITCH (ON BRAKE PEDAL SUPPORT ARM) VSS BUFFER INPUT DLC WARNING LAMP WARNING (ON MASTER BRAKE WHT WIRE YEL WIRE

452 455 PPL A/C ON SIGNAL IN BRAKE SW TO PCM AIR CONDITION- ING SYSTEM BLK WIRE BLK/RED WIRE BLK/WHT WIRE BLK/YEL WIRE BRN WIRE BRN/WHT WIRE COOLANT TEMP. SENSOR CRUISE CONTROL SYSTEM CRUISE IND REG GRD DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE DK GRN/YEL WIRE DLC THROTTLE POSITION SENSOR IN LO SIDE INJ A ECM IGN FUSE EGR ELECTRONIC VACUUM REGULATOR SOLENOID VALVE (4.3L W/NRQ, A/T OR 5.7L EGR VALVE SOLENOID EGR VALVE SOLENOID TRANS SHIFT 3/2 SOLENOID ELEC FUEL PUMP IN MAP SENSOR IN ENGINE CONTROL MODULE (UNDER RIGHT SIDE OF I/P) EVAP CANISTER PURGE CTRL EVAPORATIVE CANISTER PURGE SOLENOID FUEL PUMP RELAY CTRL PCM TRANS FORCE MTR LO FUSE BLOCK GRY WIRE GRY/RED WIRE HOT IN RUN OR START HOT IN RUN, BULB TEST OR START IDLE AIR CONTROL UNIT (RIGHT REAR OF TBI UNIT) IGNITION BYPASS INJ FUSE KNOCK SENSOR IN LT BLU/BLK WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE LT GRN/WHT WIRE ORG/ WIRE ORG/BLK WIRE OXYGEN SENSOR LO PCM TO TRANS TEMP SENSOR PCM TRANS RANGE A TRANS INPUT SPEED IN HI TRANS INPUT SPEED IN LO PCM TRANS RANGE B PCM TRANS RANGE C MIL INDICATOR CTRL PCM TRANS SHIFT SOL B PCM TRANS SHIFT SOL A PNK 25 26 27 WIRE PNK WIRE PNK/BLK WIRE PPL PPL 1 2 3 4 PPL 22 23 PPL/WHT WIRE RED WIRE RED/BLK WIRE SYSTEM GROUND TAN WIRE TAN/BLK WIRE TCC CLUTCH CTRL TCC CLUTCH CTRL THROTTLE BODY FUEL INJECTOR #1 (TOP OF THROTTLE BODY UNIT) THROTTLE BODY FUEL INJECTOR #2 (TOP OF THROTTLE BODY UNIT) TRANSMISSION INPUT SHAFT SPEED SENSOR WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE YUKON, SUBURBAN ONLY

4.3L ONLY 452 455 PPL 7.4L ONLY A/C ON SIGNAL IN BRAKE SW TO PCM AIR CONDITIONING SYSTEM BLK WIRE BLK/RED WIRE BLK/WHT WIRE BRN WIRE BRN/WHT WIRE COOLANT TEMP. SENSOR CRUISE CONTROL SYSTEM CRUISE IND REG GRD DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE DK GRN/YEL WIRE DLC SERIAL DATA DLC THROTTLE POSITION SENSOR IN LO SIDE INJ A ECM IGN FUSE EGR VALVE SOLENOID (4.3L ONLY) (LEFT REAR TOP OF ENGINE) EGR VALVE SOLENOID UPSHIFT IND CTRL ELEC FUEL PUMP IN MAP SENSOR IN ENGINE CONTROL MODULE (UNDER RIGHT SIDE OF I/P) EVAP CANISTER PURGE CTRL EVAPORATIVE CANISTER PURGE SOLENOID (ON ENGINE) FUEL PUMP RELAY CTRL FUSE BLOCK GRY WIRE HOT IN RUN OR START HOT IN RUN, BULB TEST OR START IDLE AIR CONTROL UNIT (RIGHT REAR OF TBI UNIT) IGNITION BYPASS IGNITION CONTROL (IC) VSS BUFFER SIGNAL VSS BUFFER SIGNAL INJ FUSE KNOCK SENSOR IN LINEAR EGR POSITION IN LT BLU/BLK WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE LT GRN/WHT WIRE MIL INDICATOR CTRL ORG/ WIRE ORG/BLK WIRE OXYGEN SENSOR LO PNK/BLK WIRE PPL PPL 1 2 3 4 PPL 18 19 PPL/WHT WIRE RED WIRE TAN WIRE TAN/BLK WIRE TAN/WHT WIRE THROTTLE ACTUATOR CTRL THROTTLE BODY FUEL INJECTOR #1 (TOP OF THROTTLE BODY UNIT) THROTTLE BODY FUEL INJECTOR #2 (TOP OF THROTTLE BODY UNIT) WHT WIRE WHT/BLK WIRE YEL WIRE

4.3L ONLY 423 3 121 PNK WIRE ACCY BLK WIRE BLK/RED WIRE BRN WIRE BRN/WHT WIRE BULB TEST DISTRIBUTOR (CENTER REAR OF ENGINE) DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE ENGINE COOLANT TEMPERATURE SENSOR (RIGHT TOP FRONT OF ENGINE) FUSE BLOCK GAUGES FUSE GRY WIRE HOT AT ALL TIMES HOT IN RUN, BULB TEST OR START IGNITION COIL (CENTER REAR OF ENGINE) IGNITION SWITCH INSTRUMENT CLUSTER KNOCK SENSOR (4.3L ONLY) (REAR OF ENGINE) KNOCK SENSOR (RIGHT SIDE OF ENGINE, BELOW EXHAUST MANIFOLD) LINEAR EGR REGULATOR SOLENOID VALVE (7.4L ONLY) (RIGHT TOP OF ENGINE) LOCK OFF LT GRN WIRE MANIFOLD ABSOLUTE PRESSURE SENSOR (RIGHT REAR TOP OF ENGINE) NCA WIRE ORG/ WIRE ORG/BLK WIRE PNK WIRE PNK/ BLK WIRE PNK/BLK WIRE PPL PPL 1 2 3 4 PPL 18 19 PPL PPL PPL/WHT WIRE RUN WIRE SERVICE ENGINE SOON INDICATOR TACHOMETER TEST LEAD TAN/BLK WIRE TCC/BRAKE SWITCH (TOP OF BRAKE PEDAL BRACKET) THROTTLE POSITION SENSOR (RIGHT SIDE OF THROTTLE BODY) UP- SHIFT INDIC- ATOR WHT WIRE WHT/BLK WIRE YEL WIRE

4.3L 4.3L ONLY 7.4L BLK WIRE BLK/WHT WIRE BRN WIRE DATA LINK CONNECTOR (UNDER LEFT SIDE OF I/P) DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE FUEL PUMP AND SENDER FUEL PUMP IN-LINE FUSE FUEL PUMP OIL PRESSURE SWITCH (LEFT REAR OF ENGINE, NEAR EXHAUST MANIFOLD) FUEL PUMP RELAY (RIGHT REAR OF ENGINE COMPARTMENT, NEAR BATTERY JUNCTION BLOCK) FUSE FUSE BLOCK FUSE LINK (20 GA- GRY WIRE HEATED OXYGEN SENSOR (4.3L) (IN EXHAUST Y-PIPE) HOT AT ALL TIMES HOT IN RUN INSTRUMENT CLUSTER LT BLU/BLK WIRE LT GRN/BLK WIRE OIL PRESS IN ORG/ WIRE ORG/BLK WIRE OXYGEN SENSOR (7.4L) (LEFT EXHAUST MANIFOLD) PNK/BLK WIRE PNK/WHT WIRE PPL PPL/WHT WIRE RED WIRE TACH IN TAN WIRE THROTTLE ACTUATOR SOLENOID (7.4L ONLY) (ON THROTTLE BODY UNIT) VEHICLE SPEED SENSOR (LEFT REAR SIDE OF TRANSMISSION) VEHICLE SPEED SENSOR BUFFER (UNDER RIGHT END OF I/P) VSS IN WHT WIRE WHT/BLK WIRE

452 455 PPL A/C ON SIGNAL IN BRAKE SW TO PCM AIR CONDITION- ING SYSTEM BLK WIRE BLK/RED WIRE BLK/WHT WIRE BLK/YEL WIRE BRN WIRE BRN/WHT WIRE COOLANT TEMP. SENSOR CRUISE CONTROL SYSTEM CRUISE IND REG GRD DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE DK GRN/YEL WIRE DLC THROTTLE POSITION SENSOR IN LO SIDE INJ A ECM IGN FUSE EGR ELECTRONIC VACUUM REGULATOR SOLENOID VALVE (4.3L W/NRQ, A/T OR 5.7L EGR VALVE SOLENOID EGR VALVE SOLENOID TRANS SHIFT 3/2 SOLENOID ELEC FUEL PUMP IN MAP SENSOR IN ENGINE CONTROL MODULE (UNDER RIGHT SIDE OF I/P) EVAP CANISTER PURGE CTRL EVAPORATIVE CANISTER PURGE SOLENOID FUEL PUMP RELAY CTRL PCM TRANS FORCE MTR LO FUSE BLOCK GRY WIRE GRY/RED WIRE HOT IN RUN OR START HOT IN RUN, BULB TEST OR START IDLE AIR CONTROL UNIT (RIGHT REAR OF TBI UNIT) IGNITION BYPASS INJ FUSE KNOCK SENSOR IN LT BLU/BLK WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE LT GRN/WHT WIRE ORG/ WIRE ORG/BLK WIRE OXYGEN SENSOR LO PCM TO TRANS TEMP SENSOR PCM TRANS RANGE A TRANS INPUT SPEED IN HI TRANS INPUT SPEED IN LO PCM TRANS RANGE B PCM TRANS RANGE C MIL INDICATOR CTRL PCM TRANS SHIFT SOL B PCM TRANS SHIFT SOL A PNK 25 26 27 WIRE PNK WIRE PNK/BLK WIRE PPL PPL 1 2 3 4 PPL 22 23 PPL/WHT WIRE RED WIRE RED/BLK WIRE SYSTEM GROUND TAN WIRE TAN/BLK WIRE TCC CLUTCH CTRL TCC CLUTCH CTRL THROTTLE BODY FUEL INJECTOR #1 (TOP OF THROTTLE BODY UNIT) THROTTLE BODY FUEL INJECTOR #2 (TOP OF THROTTLE BODY UNIT) TRANSMISSION INPUT SHAFT SPEED SENSOR WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE YUKON, SUBURBAN ONLY