GMC Pickup C2500 (1985-2000) suburban/ utility Wiring diagrams

AUX FUSE 22 AUXILIARY LEAD (TAPED TO HARNESS) BACK-UP LIGHTS CIRCUIT BLK WIRE BLU WIRE BRN WIRE CARGO LAMP CARGO LAMP SWITCH CENTER HIGH MOUNT STOP LAMP CHMSL LAMP (2 BULBS) CRUISE CONTROL SYSTEM CTSY FUSE 3 DK BLU WIRE DK GRN WIRE GRN WIRE GRY WIRE HAZARD NORMAL HEADLAMP, PANEL DIMMER SWITCH HEADLIGHTS SYSTEM HOT AT ALL TIMES HOT AT ALL TIMES UNDER- HOOD FUSE- RELAY CENTER (LEFT REAR OF ENGINE COMPT.) HOT IN RUN, BULB TEST OR START I/P FUSE BLOCK INSTRU- MENT CLUSTER RIGHT TURN INDIC LEFT LEFT FRONT MARKER LAMP LEFT FRONT PARK/ TURN LAMPS LEFT SPOTLAMP ASSEMBLY (POLICE PACKAGE) LEFT TAIL/ STOP/ TURN LAMP DK DK LEFT TURN INDIC LICENSE LICENSE LAMP LAMPS LT BLU WIRE LT GRN WIRE MAXI FUSE 2 NCA WIRE OFF ORG/ WIRE PARK PARK LPS FUSE 9 PICKUP PNK WIRE POLICE PACKAGE (1999 ONLY) PPL REAR CLEARANCE LAMPS CIRCUIT RED WIRE RHEO- STAT RIGHT RIGHT FRONT MARKER LAMP RIGHT FRONT PARK/ TURN LAMPS RIGHT SPOTLAMP ASSEMBLY (POLICE PACKAGE) RIGHT TAIL/ STOP/ TURN LAMP ROOF MARKER LAMPS STOP- LAMP RELAY (EXCEPT SUBUR- BAN/ UTILITY) STOP/ HAZ FUSE 1 STOPLAMP SWITCH (TOP OF BRAKE PEDAL) SUBURBAN/ UTILITY TRAILER TOW CONNECTOR TURN B/U FUSE 16 TURN PWR HAZ PWR FLSHR OUT GND TURN/ HAZARD SWITCH TURN/HAZARD FLASHER (ON CONVENIENCE CENTER) UNDER- HOOD FUSE RELAY CENTER (LEFT REAR OF ENGINE COMPT.) W/ DUAL REAR WHEELS W/ STEP BUMPER W/O STEP BUMPER WHT WIRE YEL WIRE

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

AUXILIARY HEATER- A/C LOGIC MODULE BALANCE FUEL PUMP BLK WIRE BLK/WHT WIRE CENTER HIGH MOUNT STOPLAMP CHASSIS CAB, HEAVY DUTY DOOR CONTACT BUTTON DOOR LOCK CONTROL MODULE EXCEPT CHASSIS CAB, HEAVY DUTY FRONT AUXILIARY HEATER-A/C CONTROL MODULE FRONT REAR DOME DOME LAMP LAMP FUEL LIFT PUMP INFLATABLE RESTRAINT FRONT END SENSOR INFLATABLE RESTRAINT SENSING AND DIAGNOSTIC MODULE LEFT CARGO DOOR DEFOGGER GRID LEFT LEFT REAR FRONT CLEARANCE CLEARANCE LAMP LAMP LEFT REAR FENDER LEFT REAR TAIL, STOP, LICENSE, TURN, BACKUP LAMPS LEFT REAR TAIL, STOP, TURN, LEFT BACKUP LICENSE LAMP LAMPS LEFT TAIL, STOP, LEFT TURN, LICENSE BACKUP LAMPS LAMP OVERHEAD CONSOLE LAMPS PICKUP W/ DUAL REAR WHEELS REAR AUXILIARY HEATER-A/C CONTROL MODULE REAR AUXILIARY MODE DOOR MOTOR REAR AUXILIARY TEMP DOOR MOTOR REAR BLOWER MOTOR REAR LIFTGATE WINDOW DEFOGGER GRID REAR WIPER MOTOR MODULE RIGHT CARGO DOOR DEFOGGER GRID RIGHT ENDGATE LICENSE MARKER LAMP LAMPS RIGHT LICENSE LAMP RIGHT REAR DOOR JAMB SWITCH RIGHT REAR FENDER RIGHT REAR TAIL, STOP, LICENSE, TURN, BACKUP LAMPS RIGHT REAR TAIL, STOP, TURN, BACKUP LAMPS RIGHT RIGHT REAR FRONT CLEARANCE CLEARANCE LAMP LAMP RIGHT TAIL, STOP, TURN, BACKUP LAMPS SUBURBAN/ UTILITY TRAILER GROUND (TAPED BACK) UTILITY ONLY W/ DUAL TANKS WHT WIRE

260 (CROSS BODY HARNESS, 4 DOOR 4-DOOR 2-DOOR 640 (OR 540) 1576 (OR 56) 294 39 157 1455 150 195 156 BLK (OR BLK/WHT) WIRE BLK WIRE BLK/WHT WIRE CARGO DOOR JAMB SWITCH CARGO DOOR LOCK SWITCH (W/ CARGO DOORS) CIG LTR FUSE 13 CONVENIENCE CENTER (LEFT SIDE OF DASH) DATA LINK INTERIOR CONNECTOR LAMPS (UNDER LEFT SYSTEM SIDE OF DASH) DOOR LOCK CONTROL MODULE (FRONT OF LEFT REAR WHEELWELL) DOOR LOCK RELAY (UNDER CENTER OF DASH, NEAR REMOTE CONTROL DOOR LOCK RECEIVER) GAUGES FUSE 4 GROUND DOOR JAMB SW LOCK SIG UNLOCK SIG PPL GRY WIRE HORNS SYSTEM HOT AT ALL TIMES HOT IN RUN, BULB TEST OR START I/P FUSE BLOCK (LEFT SIDE OF DASH, LEFT FRONT DOOR JAMB SWITCH LEFT FRONT DOOR LOCK ACTUATOR LEFT FRONT DOOR LOCK SWITCH LEFT REAR DOOR JAMB SWITCH LEFT REAR DOOR LOCK ACTUATOR LOCK LT BLU WIRE LUXURY ORG/ WIRE ORG/BLK WIRE PNK WIRE PPL PWR-ACCY CIRCUIT BREAKER REAR CARGO DOOR LOCK ACTUATOR (CARGO DOORS) REMOTE CONTROL DOOR LOCK RECEIVER (BEHIND CENTER OF DASH) RIGHT FRONT DOOR JAMB SWITCH RIGHT FRONT DOOR LOCK ACTUATOR RIGHT FRONT DOOR LOCK SWITCH RIGHT REAR CARGO DOOR CONTACTOR (RIGHT REAR DOOR JAMB) RIGHT REAR DOOR JAMB SWITCH RIGHT REAR DOOR LOCK ACTUATOR RR DOOR SW BATT (B+) SEAT BELT SWITCH BREAKOUT) SUBURBAN/ UTILITY TAN WIRE TRUNK, TAIL- GATE, FUEL DOORS SYSTEM UNLOCK UTILITY W/ REAR CARGO DOORS UTILITY W/ REAR LIFTGATE W/ CARGO DOORS W/ LIFTGATE W/ CARGO DOORS W/O POWER WINDOWS W/ POWER WINDOWS WHT WIRE

AUDIO ALARM MODULE AUDIO AMPLIFIER AUTOMATIC AUTOMATIC TRANSFER CASE AUTOMATIC TRANSFER CASE CONTROL MODULE BASE AUX/PWR FUSE 7 BASE CARGO DOOR LUXURY ONLY BATTERY FUSE 7 BLK WIRE CIG LTR FUSE 13 CIGAR LIGHTER COLUMN HARNESS BREAKOUT) CONVENIENCE CENTER DATA LINK CONNECTOR DOOR REAR LIFTGATE LOCK DOOR RELEASE CONTROL LOCK RELAY MODULE SWITCH ELECTRIC FROM UNDERHOOD FUSE BLOCK (DIAGRAM 1 OF 5) I/P CLUSTER BREAKOUT) I/P FUSE BLOCK LEFT FRONT DOOR LOCK SWITCH LIFTGATE RELEASE SWITCH LUXURY LEVEL LUXURY ONLY NON- BASE ORG/ WIRE OTHERS PICKUP PICKUPS W/O RKE POWER OUTLET BREAKOUT) PWR-ACCY CIRCUIT BREAKER A (REGULAR CAB/EXTENDED CAB/LUXURY) RADIO RADIO BATT FUSE 19 REAR AUXILIARY POWER CONNECTOR (LUXURY) REAR CONSOLE AUXILIARY POWER CONNECTOR (LUXURY) RED WIRE REMOTE CONTROL DOOR LOCK RECEIVER RIGHT FRONT LEFT FRONT POWER POWER LUMBAR LUMBAR SEAT SWITCH SEAT SWITCH RIGHT LUMBAR POWER SEAT RIGHT LUMBAR POWER SEAT SWITCH RIGHT POWER SEAT ADJUSTER SWITCH SEAT LUMBAR SWITCH BREAKOUT) STEERING COLUMN HARNESS BREAKOUT) STOP LAMP SWITCH STOP/HAZ FUSE 1 SUBURBAN/ UTILITY SWITCH T CASE FUSE 2 TO UNDERHOOD FUSE BLOCK (DIAGRAM 3 OF 5) TRANSFER CASE CONTROL MODULE TURN/ HAZARD SWITCH UNDERHOOD FUSE BLOCK VEHICLE INTERFACE UNIT W/ RKE W/BENCH SEAT

AUDIO ALARM MODULE AUDIO AMPLIFIER AUTOMATIC AUTOMATIC TRANSFER CASE AUTOMATIC TRANSFER CASE CONTROL MODULE BASE AUX/PWR FUSE 7 BASE CARGO DOOR UPPER LEVLE BATTERY FUSE 7 BLK WIRE CIG LTR FUSE 13 CIGAR LIGHTER COLUMN HARNESS BREAKOUT) CONVENIENCE CENTER DATA LINK CONNECTOR DOOR REAR LIFTGATE LOCK DOOR RELEASE CONTROL LOCK RELAY MODULE SWITCH ELECTRIC FROM UNDERHOOD FUSE-RELAY CENTER (DIAGRAM 1 OF 6) I/P CLUSTER BREAKOUT) I/P FUSE BLOCK INSTRUMENT CLUSTER LEFT FRONT DOOR LOCK SWITCH LIFTGATE RELEASE SWITCH NON- BASE ORG/ WIRE OTHERS PICKUP POLICE PACKAGE UPPER LEVEL POWER OUTLET BREAKOUT) PWR-ACCY CIRCUIT BREAKER (REGULAR CAB/EXTENDED CAB) RADIO RADIO BATT FUSE 19 REAR AUXILIARY POWER CONNECTOR REAR CONSOLE AUXILIARY POWER CONNECTOR RED WIRE REMOTE CONTROL DOOR LOCK RECEIVER REMOTE RIGHT FRONT CONTROL DOOR LOCK DOOR LOCK SWITCH RECEIVER RIGHT FRONT LEFT FRONT POWER POWER LUMBAR LUMBAR SEAT SWITCH SEAT SWITCH RIGHT LUMBAR POWER SEAT RIGHT LUMBAR POWER SEAT SWITCH RIGHT POWER SEAT ADJUSTER SWITCH SEAT LUMBAR SWITCH BREAKOUT) STEERING COLUMN HARNESS BREAKOUT) STOP LAMP SWITCH STOP/HAZ FUSE 1 SUBURBAN/ UTILITY SWITCH T CASE FUSE 2 TO SEATS FUSE (DIAGRAM 3 OF 6) TRANSFER CASE CONTROL MODULE TURN/ HAZARD SWITCH UNDERHOOD FUSE-RELAY CENTER UPPER LEVEL VEHICLE INTERFACE UNIT W/ RKE W/BENCH SEAT W/O RKE