GMC Sierra 2500 (2000-2004) nca Wiring diagrams

1320 1339 582 PNK WIRE 15 14 35 SERIAL DATA SERIAL DATA ACCELERATOR PEDAL POSITION SENSOR (ABOVE ACCELERATOR PEDAL) APP SENS BLK WIRE BLK/WHT WIRE BRN WIRE CLUTCH PEDAL POSITION SWITCH (TOP OF CLUTCH PEDAL) CLUTCH SW INPUT CRUISE CONTROL SWITCH CRUISE FUSE DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE ECT FUSE ENGINE WIRING HARNESS JUNCTION BLOCK (LEFT SIDE OF ENGINE COMPT NEAR BATTERY) FUSE BLOCK (ON LOWER LEFT SIDE OF DASH) GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES HOT IN RUN OR START HOT IN RUN, START LT BLU WIRE LT BLU/BLK WIRE LT GRN/BLK WIRE NCA WIRE OFF ORG/ WIRE ORG/BLK WIRE PNK WIRE POWERTRAIN CONTROL MODULE (LEFT FRONT OF ENGINE COMPT) PPL PPL/WHT WIRE RESUME/ACCEL SENS 1 GRD APP SENS 3 SENS 1 RT APP SENS SENS 3 RT SENS 2 RT APP SENSE PPL SET/COAST STOP LPS FUSE STOPLAMP SWITCH (ON TOP OF BRAKE PEDAL BRACKET) TAN WIRE THROTTLE ACTUATOR CONTROL (TAC) MODULE (NEAR FRONT OF ENGINE COMPT) THROTTLE ACTUATOR CONTROL MOTOR (NEAR FRONT OF ENGINE COMPT) THROTTLE POSITION SENSOR (DUAL TRACK) (NEAR FRONT OF ENGINE COMPARTMENT) VEH STOP FUSE VEHICLE SPEED SENSOR (VSS) VEHICLE SPEED SENSOR ADAPTER (4 WD) (ON LEFT SIDE OF TRANSMISSION) VSS HIGH VSS LOW WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE

1320 1339 582 PNK WIRE 15 14 35 SERIAL DATA SERIAL DATA ACCELERATOR PEDAL POSITION SENSOR (ABOVE ACCELERATOR PEDAL) APP SENS BLK WIRE BLK/WHT WIRE BRN WIRE CLUTCH PEDAL POSITION SWITCH (TOP OF CLUTCH PEDAL) CLUTCH SW INPUT CRUISE CONTROL SWITCH CRUISE FUSE DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE ECT FUSE ENGINE WIRING HARNESS JUNCTION BLOCK (LEFT SIDE OF ENGINE COMPT NEAR BATTERY) FUSE BLOCK (ON LOWER LEFT SIDE OF DASH) GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES HOT IN RUN OR START HOT IN RUN, START LT BLU WIRE LT BLU/BLK WIRE LT GRN/BLK WIRE NCA WIRE OFF ORG/ WIRE ORG/BLK WIRE PNK WIRE POWERTRAIN CONTROL MODULE (LEFT FRONT OF ENGINE COMPT) PPL PPL/WHT WIRE RESUME/ACCEL SENS 1 GRD APP SENS 3 SENS 1 RT APP SENS SENS 3 RT SENS 2 RT APP SENSE PPL SET/COAST STOP LPS FUSE STOPLAMP SWITCH (ON TOP OF BRAKE PEDAL BRACKET) TAN WIRE THROTTLE ACTUATOR CONTROL (TAC) MODULE (NEAR FRONT OF ENGINE COMPT) THROTTLE ACTUATOR CONTROL MOTOR (NEAR FRONT OF ENGINE COMPT) THROTTLE POSITION SENSOR (DUAL TRACK) (NEAR FRONT OF ENGINE COMPARTMENT) VEH STOP FUSE VEHICLE SPEED SENSOR (VSS) VEHICLE SPEED SENSOR ADAPTER (4 WD) (ON LEFT SIDE OF TRANSMISSION) VSS HIGH VSS LOW WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE

20 29 21 30 49 15 EXCEPT 4.3 L 4.3L ABS FUSE BLK WIRE BLK/WHT WIRE BODY WIRING HARNESS JUNCTION BLOCK (NEAR LEFT KICK PANEL) BRAKE FLUID LEVEL SW IN BRAKE FLUID LEVEL SWITCH (LEFT SIDE OF BRAKE FLUID RESERVOIR) BRAKE FUSE BRAKE INPUT SERIAL DATA BRAKE PRESSURE MODULATOR VALVE BRN WIRE DATA LINK CONNECTOR (BELOW STEERING COLUMN) DK GRN WIRE DK GRN/WHT WIRE ELECTRONIC BRAKE CONTROL MODULE (LEFT SIDE OF INNER FRAME) ENGINE CONTROL SYSTEM ENGINE WIRING HARNESS JUNCTION BLOCK (LEFT SIDE OF ENGINE COMPT) FRONT AXLE ACTUATOR/ SWITCH (ON AXLE HOUSING) FUSE BLOCK (LOWER LEFT SIDE OF DASH) GROUND MOTOR, SOLENOID PWR GRY WIRE HOT AT ALL TIMES HOT IN RUN HOT IN RUN AND START IGN 1 FUSE IGNITION LEFT FRONT SENSOR (-) RIGHT FRONT SENSOR (+) INSTRUMENT CLUSTER LEFT FRONT WHEEL SPEED SENSOR LOGIC LT BLU WIRE LT GRN/BLK WIRE NCA WIRE PNK WIRE POWER DISTRIBUTION SYSTEM POWERTRAIN CONTROL MODULE OR VEHICLE CONTROL MODULE (LEFT FRONT OF ENGINE COMPT) PPL PPL PPL PPL/WHT WIRE PUMP MOTOR RED WIRE RIGHT FRONT WHEEL SPEED SENSOR SPLICE PACK 205 CENTER (NEAR LEFT KICK PANEL) STOPLAMP SWITCH (TOP OF BRAKE PEDAL BRACKET) TAN WIRE VEHICLE SPEED SENSOR (LEFT REAR OF TRANSMISSION) VEHICLE SPEED SENSOR ADAPTER VSS HIGH VSS LOW VSS OUTPUT YEL WIRE YEL/BLK WIRE

AMBIENT LIGHT SENSOR (TOP CENTER OF DASH) ANTI-THEFT SYSTEM ANTI-THEFT SYSTEM DOOR LOCKS SYSTEM BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (ON LOWER LEFT SIDE OF DASH, BELOW STEERING COLUMN) BODY RELAY BLOCK (NEAR LEFT KICK PANEL) BODY RELAY BLOCK (UNDER LEFT SIDE OF DASH) BRN WIRE CARGO LP SW INPUT INTERIOR LAMP CTRL FLASH TO PASS SW SIG DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE DOOR LATCH SW SIG COURTESY LAMP PWR DOOR LOCKS SYSTEM DOOR LOCKS SYSTEM DRIVER DOOR KEY SW SIG LF DR OPEN SW SIG FRONT FOG LP SW INT LP DEFEAT SW SIG DRL RLY COIL CLASS 2 DATA GROUND IGN 1 EXTERIOR LIGHTS SYSTEM EXTERIOR LIGHTS SYSTEM FOG LP RLY CTRL EXTERIOR COURTESY LPS RLY CTRL GROUND BATTERY DOOR UNLOCK CTRL DOOR LOCK CTRL GRY WIRE GRY/BLK WIRE HEADLAMP SW INPUT LED DIM SIG VSS HEADLIGHTS SYSTEM COMPUTER DATA LINES SYSTEM HEADLIGHTS SYSTEM EXTERIOR LIGHTS SYSTEM HEADLIGHTS SYSTEM INTERIOR LIGHTS SYSTEM HEADLIGHTS SYSTEM INTERIOR LIGHTS SYSTEM ENGINE CONTROLS SYSTEM HOT AT ALL TIMES TBC FUSE HOT IN RUN CRUISE FUSE HOT IN RUN, START IGN 1 FUSE IGN 3 PRK BK SW SIG LT SEAT BELT SW TOW/HAUL SW SIG IGNITION KEY ALARM SWITCH INST PANEL LP PWR AMBIENT LIGHT SEN SIG INTERIOR LIGHTS SYSTEM INTERIOR LIGHTS SYSTEM INTERIOR LIGHTS SYSTEM INTERIOR LIGHTS SYSTEM HEADLIGHTS SYSTEM KEY IN IGN SW SIG LEFT I/P FUSE BLOCK LT BLU WIRE LT GRN WIRE LT GRN/BLK WIRE LT TURN SIG LAMP PWR RT TURN SIG LAMP PWR NCA WIRE ORG/ WIRE ORG/BLK WIRE PARK BRAKE SWITCH PNK WIRE POWER DISTRIBUTION SYSTEM POWER DISTRIBUTION SYSTEM (RAP) INTERIOR LIGHTS SYSTEM HORNS SYSTEM PPL PPL HIGH BEAM INPUT INTERIOR PARK LP PWR PPL/WHT WIRE RAP RELAY CTRL INADVERTENT PWR RLY CTRL HORN RLY CTRL RED/WHT WIRE SECURITY SYSTEM SEN SIG SERIAL DATA TAN WIRE TOW/HAUL SWITCH UNDERHOOD JUNCTION BLOCK WARNING SYSTEM WHT WIRE YEL WIRE

1995 VFTC BATTERY BLK WIRE BODY COMPUTER SYSTEM BODY WIRING HARNESS JUNCTION BLOCK (UNDER LEFT SIDE OF DASH) BRN WIRE COMPUTER DATA LINES SYSTEM DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE ENGINE COMPT, NEAR BATTERY) ENGINE WIRING HARNESS JUNCTION BLOCK (LEFT SIDE OF EVO ACTUATOR (PART OF POWER STEERING PUMP) GRN WIRE GROUND GROUND GRY WIRE HOT AT ALL TIMES HOT IN RUN I/P FUSE BLOCK I/P WIRING HARNESS JUNCTION BLOCK (LOWER RIGHT SIDE OF DASH) IGN 3 FUSE IGNITION INSTRUMENT CLUSTER SYSTEM LT BLU WIRE NCA WIRE ORG/ WIRE ORG/BLK WIRE POWER DISTRIBUTION SYSTEM POWERTRAIN CONTROL MODULE (ON LEFT FRONT OF ENGINE COMPARTMENT) RTD FUSE SERIAL DATA EVO FEED EVO RETURN STEERING HAND WHEEL POSITION/SPEED SENSOR (NEAR BASE OF STEERING COLUMN) SUSPENSION CONTROL MODULE (REAR OF RIGHT WHEELWELL) TRACK 1 INPUT TRACK 2 INPUT LOW REFERENCE VSS INPUT WHT WIRE

1 2 3 4 5 6 PNK WIRE 2 3 4 PPL AIR MAXI FUSE BLK WIRE BLK/WHT WIRE BRN WIRE BRN/RED WIRE DK BLU WIRE DK BLU/WHT WIRE DK GRN/WHT WIRE ECM-B FUSE ENGINE COOLANT LEVEL SWITCH (IN COOLANT RESERVOIR) ENGINE COOLANT TEMPERATURE SENSOR (LEFT FRONT OF CYLINDER HEAD) ENGINE OIL LEVEL SWITCH (RIGHT SIDE OF OIL PAN) FUEL PUMP RELAY FUEL PUMP/ LEVEL SENSOR (IN FUEL TANK) GRY WIRE HEATED OXYGEN SENSOR (BANK 1 SENSOR 1) (LEFT EXH PIPE, BEFORE CONVERTER) HEATED OXYGEN SENSOR (BANK 2 SENSOR 2) (RIGHT EXH PIPE, AFTER CONVERTER) HOT AT ALL TIMES HOT IN RUN, START IGN E FUSE KNOCK SENSOR 1 (UNDER INTAKE MANIFOLD) KNOCK SENSOR 2 (UNDER INTAKE MANIFOLD) LT BLU WIRE LT GRN WIRE NCA WIRE ORG/BLK WIRE PARK/NEUTRAL POSITION SWITCH (LEFT SIDE OF TRANSMISSION) PNK PNK WIRE PNK PPL 7 8 WIRE PNK WIRE PNK/BLK WIRE PPL PPL 5 6 PPL PNK PNK 16 17 18 WIRE PPL PPL PPL/WHT WIRE RED WIRE SECONDARY AIR INJECTION REACTION PUMP (RIGHT REAR OF ENGINE COMPT) SECONDARY AIR INJECTION REACTION RELAY (RIGHT REAR OF ENGINE COMPARTMENT) SECONDARY AIR INJECTION REACTION SOLENOID (RIGHT REAR OF ENGINE COMPT) TAN WIRE TAN/WHT WIRE UNDER- HOOD JUNCTION BLOCK WHT WIRE WHT/ BLK WIRE YEL WIRE

28 29 30 PNK WIRE A/C REQ A/C SYSTEM AIR PUMP ANTI-LOCK BRAKE SYSTEM ANTI-LOCK BRAKE SYSTEM (SPEED SIGNAL) AUTOMATIC TRANSFER CASE CONTROL MODULE (ABOVE HEADLIGHT SWITCH) BLK WIRE BLK/ GRY WIRE BLK/WHT WIRE BRN WIRE BRN/WHT WIRE CRUISE CONTROL SYSTEM CRUISE ENG CTRL DELIVERED TORQ PC SOL HI EGR CTRL PC SOL LO FUEL PMP RPM OUT RECIRC SW DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE EVAP VENT MIL CTRL 2-3 SS 1-2 SS VSS OUT VSS OUT TFT SENS SIG GEN F FRONT AXLE SWITCH (RIGHT SIDE OF CENTER ON AXLE HOUSING) FRT AXLE SW VSS LOW VSS HIGH FUSE FUSE BLOCK GEN L GRY WIRE GRY/BLK WIRE HOT IN RUN, START IAC COIL HI IAC COIL LO IAC COIL LO IAC COIL HI IDLE AIR CONTROL VALVE (TOP OF THROTTLE BODY) IGN IGN CTRL IGN CTRL IGN CTRL IGN CTRL IGN FEED GND EGR GND TCC SOL A/C CLU IGNITION COILS INSTRUMENT CLUSTER SYSTEMS (SPEED SIGNAL) INSTRUMENT PANEL CLUSTER MALFUNCTION INDICATOR LAMP LT BLU WIRE LT BLU/BLK WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE LT GRN/WHT WIRE MAF SIG MAP SIG RECIRC DOOR EVAP CANP NCA WIRE PNK PNK WIRE PNK WIRE POWERTRAIN CONTROL MODULE (LEFT FRONT OF ENGINE COMPT) PPL PPL FUEL LEV CYC SW IN PPL PNK PNK 24 25 26 27 WIRE PPL/WHT WIRE RED WIRE RED/BLK WIRE RED/WHT WIRE REF LO REF LOW REF LOW PRND C TRANS RNG A FUEL SIG CTRL RPM OUT SENS GND SPARK PLUG SPARK PLUG SPARK PLUG STARTING/CHARGING SYSTEM TAN WIRE TAN/BLK WIRE TP SIG IAT SIG IGN CTRL IGN CTRL IGN CTRL IGN CTRL TRANSFER CASE SWITCH (LEFT FRONT OF TRANSAXLE CASE) UNDER- HOOD JUNCTION BLOCK W/ ATC WHT WIRE YEL WIRE YEL/BLK WIRE

2 3 4 PPL AIR MAXI FUSE BLK WIRE BLK/WHT WIRE BRN WIRE BRN/RED WIRE DK BLU WIRE DK BLU/WHT WIRE DK GRN/WHT WIRE ECM-B FUSE ENGINE COOLANT LEVEL SWITCH (IN COOLANT RESERVOIR) ENGINE COOLANT TEMPERATURE SENSOR (LEFT FRONT OF CYLINDER HEAD) ENGINE OIL LEVEL SWITCH (RIGHT SIDE OF OIL PAN) FUEL PUMP RELAY FUEL PUMP/ LEVEL SENSOR (IN FUEL TANK) GRY WIRE HEATED OXYGEN SENSOR (BANK 2 SENSOR 2) (RIGHT EXH PIPE, AFTER CONVERTER) HOT AT ALL TIMES HOT IN RUN, START IGN E FUSE KNOCK SENSOR 1 (UNDER INTAKE MANIFOLD) LT BLU WIRE LT GRN WIRE NCA WIRE ORG/BLK WIRE PARK/NEUTRAL POSITION SWITCH (LEFT SIDE OF TRANSMISSION) PNK 1 2 3 4 5 WIRE PNK PNK WIRE PNK PPL 6 7 WIRE PNK WIRE PNK/BLK WIRE PPL PPL 5 6 PPL PNK PNK 16 17 18 WIRE PPL PPL PPL/WHT WIRE RED WIRE SECONDARY AIR INJECTION REACTION PUMP (RIGHT REAR OF ENGINE COMPT) SECONDARY AIR INJECTION REACTION RELAY (RIGHT REAR OF ENGINE COMPARTMENT) SECONDARY AIR INJECTION REACTION SOLENOID (RIGHT REAR OF ENGINE COMPT) TAN WIRE UNDER- HOOD JUNCTION BLOCK WHT WIRE WHT/ BLK WIRE YEL WIRE

28 29 30 PNK WIRE A/C REQ A/C SYSTEM AIR PUMP ANTI-LOCK BRAKE SYSTEM ANTI-LOCK BRAKE SYSTEM (SPEED SIGNAL) AUTOMATIC TRANSFER CASE CONTROL MODULE (ABOVE HEADLIGHT SWITCH) BLK WIRE BLK/ GRY WIRE BLK/WHT WIRE BRN WIRE BRN/WHT WIRE CRUISE CONTROL SYSTEM CRUISE ENG CTRL DELIVERED TORQ PC SOL HI EGR CTRL PC SOL LO FUEL PMP RPM OUT RECIRC SW DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE EVAP VENT MIL CTRL 2-3 SS 1-2 SS VSS OUT VSS OUT TFT SENS SIG GEN F FRONT AXLE SWITCH (RIGHT SIDE OF CENTER ON AXLE HOUSING) FRT AXLE SW VSS LOW VSS HIGH FUSE FUSE BLOCK GEN L GRY WIRE GRY/BLK WIRE HOT IN RUN, START IAC COIL HI IAC COIL LO IAC COIL LO IAC COIL HI IDLE AIR CONTROL VALVE (TOP OF THROTTLE BODY) IGN IGN CTRL IGN CTRL IGN CTRL IGN CTRL IGN FEED GND EGR GND TCC SOL A/C CLU IGNITION COILS INSTRUMENT CLUSTER SYSTEMS (SPEED SIGNAL) INSTRUMENT PANEL CLUSTER MALFUNCTION INDICATOR LAMP LT BLU WIRE LT BLU/BLK WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE LT GRN/WHT WIRE MAF SIG MAP SIG RECIRC DOOR EVAP CANP NCA WIRE PNK PNK WIRE PNK WIRE POWERTRAIN CONTROL MODULE (LEFT FRONT OF ENGINE COMPT) PPL PPL FUEL LEV CYC SW IN PPL PNK PNK 24 25 26 27 WIRE PPL/WHT WIRE RED WIRE RED/BLK WIRE RED/WHT WIRE REF LO REF LOW REF LOW PRND C TRANS RNG A FUEL SIG CTRL RPM OUT SENS GND SPARK PLUG SPARK PLUG SPARK PLUG STARTING/CHARGING SYSTEM TAN WIRE TAN/BLK WIRE TP SIG IAT SIG IGN CTRL IGN CTRL IGN CTRL IGN CTRL TRANSFER CASE SWITCH (LEFT FRONT OF TRANSAXLE CASE) UNDER- HOOD JUNCTION BLOCK W/ ATC WHT WIRE YEL WIRE YEL/BLK WIRE

1 2 3 4 5 6 PNK WIRE 2 3 4 PPL BLK WIRE BLK/WHT WIRE BRN WIRE BRN/RED WIRE DK BLU WIRE DK BLU/WHT WIRE DK GRN/WHT WIRE ECM-B FUSE ENGINE COOLANT LEVEL SWITCH (IN COOLANT RESERVOIR) ENGINE COOLANT TEMPERATURE SENSOR (LEFT FRONT OF CYLINDER HEAD) ENGINE OIL LEVEL SWITCH (RIGHT SIDE OF OIL PAN) ENGINE WIRING HARNESS JUNCTION BLOCK FRONT KNOCK SENSOR (UNDER INTAKE MANIFOLD) FUEL PUMP RELAY GRY WIRE HEATED OXYGEN SENSOR (BANK 1 SENSOR 1) (LEFT EXH PIPE, BEFORE CONVERTER) HEATED OXYGEN SENSOR (BANK 2 SENSOR 2) (RIGHT EXH PIPE, AFTER CONVERTER) HOT AT ALL TIMES LT BLU WIRE LT GRN WIRE NCA WIRE ORG/BLK WIRE PARK/NEUTRAL POSITION SWITCH (LEFT SIDE OF TRANSMISSION) PNK PNK WIRE PNK PPL 7 8 WIRE PNK WIRE PNK/BLK WIRE PPL PPL PNK 5 6 WIRE PPL PNK PNK 17 18 19 WIRE PPL PPL PPL/WHT WIRE PRIMARY FUEL PUMP/ LEVEL SENSOR (IN FUEL TANK) REAR KNOCK SENSOR (UNDER INTAKE MANIFOLD) RED WIRE SECONDARY FUEL PUMP RELAY (UTILITIES ONLY) SECONDARY FUEL PUMP/ LEVEL SENSOR (UTILITIES ONLY) (IN FUEL TANK) TAN WIRE TAN/WHT WIRE THROTTLE POSITION SENSOR (ON THROTTLE BODY ASSY) WHT WIRE WHT/ BLK WIRE YEL WIRE