GMC Pickup C2500 (1985-2000) gry Wiring diagrams

1-2 SHIFT SOL 2-3 SHIFT SOL 3-2 SHIFT SOL TRANS FLUID TEMP (TFT) SENSOR BLK WIRE BLK/WHT WIRE BLK/YEL WIRE BRAKE FUSE 18 BRN WIRE BRN/WHT WIRE DATA LINK CONNECTOR (BELOW LEFT SIDE OF DASH) DK BLU WIRE DK BLU/WHT WIRE ECM I FUSE ECM-B FUSE ENGINE COOLANT TEMPERATURE (ECT) SENSOR (TOP FRONT OF ENGINE) GAGES FUSE 4 GRY WIRE HOT AT ALL TIMES HOT IN RUN HOT IN RUN OR START HOT IN RUN, BULB TEST OR START I/P FUSE BLOCK INSTRUMENT CLUSTER LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE ORG/ WIRE PNK WIRE POWERTRAIN CONTROL MODULE (PCM) (UNDER RIGHT END OF DASH) PPL PPL PNK WIRE PPL/WHT WIRE PRESSURE CONTROL SOLENOID RANGE MODE SELECTOR RED WIRE RED/BLK WIRE SERVICE ENGINE SOON SPEED SENSOR (LEFT REAR SIDE OF TRANSMISSION) TAN WIRE TCC/STOPLAMP SWITCH (ON BRAKE PEDAL BRACKET) THROTTLE POSITION SENSOR (RIGHT SIDE OF TBI) TRANS FUSE 20 TRANSMISSION TRANSMISSION INPUT SHAFT SPEED SENSOR (FRONT OF TRANSMISSION) UNDERHOOD FUSE/RELAY CENTER VEHICLE SPEED SENSOR BUFFER (UNDER RIGHT END OF DASH) WHT/BLK WIRE YEL WIRE YEL/BLK WIRE

BLK WIRE CIG LTR FUSE 13 CIRCUIT BREAKER A CONVENIENCE CENTER DOOR LOCK RELAY (UNDER I/P, RIGHT SIDE OF BRAKE PEDAL BRACKET) FUSE BLOCK GRY WIRE HOT AT ALL TIMES LEFT FRONT DOOR LOCK MOTOR SOLID STATE LEFT FRONT DOOR LOCK SWITCH LEFT REAR DOOR LOCK MOTOR SOLID STATE LOCK UNLOCK LT BLU WIRE ORG/ WIRE RIGHT FRONT DOOR LOCK MOTOR SOLID STATE RIGHT FRONT DOOR LOCK SWITCH RIGHT REAR DOOR LOCK MOTOR SOLID STATE TAN WIRE UNLOCK LOCK UNLOCK RELAY LOCK RELAY WHT WIRE

BATTERY BATTERY LIFTGATE/CARGO REL BLK WIRE BLK/WHT WIRE CONVENIENCE CENTER DATA LINK CONNECTOR (UNDER LEFT SIDE OF I/P) DOOR LOCK RELAY FUSE BLOCK (LOWER LEFT SIDE OF I/P) GAUGES FUSE 4 GRY WIRE HOT AT ALL TIMES CIG LTR FUSE 14 HOT AT ALL TIMES PWR ACCY CIRCUIT BREAKER A HOT IN RUN, BULB TEST OR START KEYLESS ENTRY MODULE (BEHIND CENTER OF I/P) L FNT DR UNLK OUTPUT INT LTS INPUT GROUND LEFT FRONT DOOR LOCK MOTOR LEFT FRONT DOOR LOCK SWITCH LIFTGATE RELEASE MOTOR LOCK LOCK DOORS OUTPUT UNLK DOORS OUTPUT LT BLU WIRE ORG/ WIRE PNK IGNITION WIRE PNK WIRE PROGRAM ENABLE REAR CARGO DOOR LOCK MOTOR (UTILITY ONLY) RIGHT FRONT DOOR LOCK MOTOR RIGHT FRONT DOOR LOCK SWITCH TAN WIRE UNLOCK UTILITY W/ LIFTGATE WHT WIRE

BATTERY LIFTGATE RELEASE OUT BLK WIRE BLK/WHT WIRE CIG LTR FUSE 14 CONVENIENCE CENTER DATA LINK CONNECTOR DOOR LOCK RELAY UNLOCK FUSE BLOCK (LOWER LEFT SIDE OF I/P) GRY WIRE HOT AT ALL TIMES HOT AT ALL TIMES PWR ACCY CIRCUIT BREAKER A HOT IN RUN, BULB TEST OR START GAUGES FUSE 4 KEYLESS ENTRY MODULE (BEHIND CENTER OF I/P) L FNT DR UNLK OUT JAMB SWITCH INPUT GROUND LEFT FRONT DOOR LOCK MOTOR LEFT FRONT DOOR LOCK SWITCH LEFT REAR DOOR LOCK MOTOR LOCK LOCK DOORS OUT UNLK DOORS OUT LT BLU WIRE ORG/ WIRE PNK IGNITION WIRE PNK WIRE PROGRAM ENABLE INPUT RIGHT FRONT DOOR LOCK MOTOR RIGHT FRONT DOOR LOCK SWITCH RIGHT REAR DOOR LOCK MOTOR TAN WIRE TRUNK, TAILGATE, FUEL DOORS SYSTEM UNLOCK WHT WIRE

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 RR+ RR- ANTENNA BARE BLK WIRE BRN WIRE CIG LTR FUSE 13 DIESEL GAS DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE GRY WIRE HOT AT ALL TIMES HOT IN ACC OR RUN I/P FUSE BLOCK LEFT FRONT SPEAKER LEFT FRONT TWEETER LEFT REAR DOOR SPEAKER LEFT REAR SPEAKER LR DR - RLY SIG GROUND LR DR + LR+ LR- RR DR + LT BLU WIRE LT GRN WIRE NCA WIRE ORG/ WIRE ORG/BLK WIRE PNK WIRE POWER AMPLIFIER (UNDER LEFT SIDE OF DASH) POWER AMPLIFIER RELAY (UNDER LEFT SIDE OF DASH) PPL/WHT WIRE RADIO RADIO BATT FUSE 19 RADIO FUSE 17 RED WIRE REMOTE AUDIO PLAYER RIGHT FRONT SPEAKER RIGHT FRONT TWEETER RIGHT REAR DOOR SPEAKER RIGHT REAR SPEAKER RR DR - SERIAL DATA VSS SIGNAL RR - RR + LR _ LR + TAN WIRE VEHICLE CONTROL MODULE (LEFT SIDE OF ENGINE COMPARTMENT) VEHICLE SPEED SENSOR BUFFER (BEHIND RIGHT SIDE OF DASH) VSS SIGNAL WHT WIRE YEL WIRE

ANTENNA BARE BLK WIRE BRN WIRE DIESEL GAS DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE GRY WIRE HOT AT ALL TIMES HOT IN ACC OR RUN I/P FUSE BLOCK LEFT FRONT SPEAKER LEFT FRONT TWEETER LEFT REAR SPEAKER LT BLU WIRE LT GRN WIRE NCA WIRE ORG/ WIRE ORG/BLK WIRE PPL/WHT WIRE RADIO RADIO BATT FUSE 19 RADIO FUSE 17 REMOTE AUDIO PLAYER RIGHT FRONT SPEAKER RIGHT FRONT TWEETER RIGHT REAR SPEAKER SERIAL DATA VSS SIGNAL RR - RR + LR _ LR + TAN WIRE VEHICLE CONTROL MODULE (LEFT SIDE OF ENGINE COMPARTMENT) VEHICLE SPEED SENSOR BUFFER (BEHIND RIGHT SIDE OF DASH) VSS SIGNAL YEL WIRE

1000 OHMS AIR BAG FUSE 10 AIR BAG INDICATOR AUDIO ALARM MODULE BLK WIRE BLK/WHT WIRE BRN WIRE CONVENIENCE CENTER (UNDER LEFT SIDE OF DASH) DK GRN WIRE DK GRN/WHT WIRE GAUGES FUSE 4 GRN WIRE GRY WIRE HOT IN RUN, START I/P FUSE BLOCK (UNDER LEFT SIDE OF DASH) INFLATABLE RESTRAINT I/P MODULE INFLATABLE RESTRAINT IP MODULE SWITCH (PICK UP ONLY) INFLATABLE RESTRAINT STEERING WHEEL MODULE INFLATABLE RESTRAINT STEERING WHEEL MODULE COIL INSTRUMENT CLUSTER OFF PNK WIRE PPL/WHT WIRE SEAT BELT SWITCH (CLOSED W/SEAT BELT UNBUCKLED) (ON DRIVER'S SEAT BELT BUCKLE) SHORTING BAR SHORTING BAR DK TAN WIRE TAN/BLK WIRE W/LUXURY PACKAGE W/LUXURY PACKAGE W/O LUXURY PACKAGE W/O LUXURY PACKAGE WHT WIRE WHT/BLK WIRE YEL WIRE

5 CM FROM TRANSFER CASE BREAK-OUT) BLK WIRE BLK/WHT WIRE BRN WIRE CONVENIENCE CENTER DIESEL FROM ENGINE HARN BREAK-OUT) FRONT AXLE ACTUATOR FRONT AXLE SWITCH FUSE 24 GASOLINE GRY WIRE GRY/BLK WIRE HOT IN PARK OR HEAD HOT IN RUN I/P FUSE BLOCK ILLUM FUSE 14 INDICATOR LT BLU WIRE POWERTRAIN CONTROL MODULE (REARWARD OF LEFT SHOCK TOWER) RED WIRE TRANSFER CASE MODE SELECTOR ILLUMINATION LAMP TRANSFER CASE RELAY TRANSFER CASE SWITCH (TOP LEFT OF TRANSFER CASE) TRANSFER CASE SYNCHRONIZER

5 CM FROM TRANSFER CASE BREAK-OUT) BLK WIRE BLK/WHT WIRE BRN WIRE CONVENIENCE CENTER DIESEL FROM ENGINE HARN BREAK-OUT) FRONT AXLE ACTUATOR FRONT AXLE SWITCH FUSE 24 GASOLINE GRY WIRE GRY/BLK WIRE HOT IN PARK OR HEAD HOT IN RUN I/P FUSE BLOCK ILLUM FUSE 14 INDICATOR LT BLU WIRE POWERTRAIN CONTROL MODULE (REARWARD OF LEFT SHOCK TOWER) RED WIRE TRANSFER CASE MODE SELECTOR ILLUMINATION LAMP TRANSFER CASE RELAY TRANSFER CASE SWITCH (TOP LEFT OF TRANSFER CASE) TRANSFER CASE SYNCHRONIZER

5 CM FROM TRANSFER CASE BREAK-OUT) BLK WIRE BLK/WHT WIRE BRN WIRE CONVENIENCE CENTER DIESEL FROM ENGINE HARN BREAK-OUT) FRONT AXLE ACTUATOR FRONT AXLE SWITCH FUSE 24 GASOLINE GRY WIRE GRY/BLK WIRE HOT IN PARK OR HEAD HOT IN RUN I/P FUSE BLOCK ILLUM FUSE 14 INDICATOR LT BLU WIRE POWERTRAIN CONTROL MODULE (REARWARD OF LEFT SHOCK TOWER) RED WIRE TRANSFER CASE MODE SELECTOR ILLUMINATION LAMP TRANSFER CASE RELAY TRANSFER CASE SWITCH (TOP LEFT OF TRANSFER CASE) TRANSFER CASE SYNCHRONIZER