GMC Suburban C1500 (1985-1999) lt blu Wiring diagrams

BLK WIRE BLK/WHT WIRE BRAKE FUSE 18 BRAKE PRESSURE MODULATOR VALVE: ANTI-LOCK BRAKES SYSTEM BRN WIRE BRN/WHT WIRE CLUTCH PEDAL SWITCH (TOP OF CLUTCH PEDAL) CRUISE CONTROL MODULE (LEFT REAR SIDE OF ENGINE COMPARTMENT) CRUISE CONTROL SWITCH CRUISE FUSE 6 CRUISE INPUT CRUISE ON INPUT S/C SIGNAL R/A SIGNAL DK BLU WIRE DK GRN/WHT WIRE FUSE BLOCK GROUND GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES HOT IN RUN LT BLU WIRE LT BLU/BLK WIRE LT GRN WIRE M/T A/T OFF ORG/ WIRE PCM SIGNAL SPEED SENSOR INPUT POWERTRAIN CONTROL MODULE (UNDER RIGHT SIDE OF I/P) PPL PPL STOPLAMP/CLUTCH SW IN R/A S/C ON STOP/HAZ FUSE 1 STOPLAMP SW INPUT TCC/ STOPLAMP SWITCH (TOP OF BRAKE PEDAL) VEHICLE SPEED SENSOR VEHICLE SPEED SENSOR BUFFER (UNDER RIGHT SIDE OF I/P) 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

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

A/T ACCY AIR BAG ANTI-LOCK BRAKES ANTI-LOCK BRAKES SYSTEM BLK WIRE BLK/WHT WIRE BRAKE PRESSURE WARNING SWITCH (ON REAR OF BRAKE PRESSURE MODULATOR VALVE BODY) BRAKE/ BRN WIRE BRN/WHT WIRE BULB TEST CHECK GAUGES CHECK GAUGES LAMP DRIVER CONVENIENCE CENTER (BEHIND LEFT SIDE OF I/P) DAYTIME RUNNING LAMPS DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE ELECTRONIC PRNDL DISPLAY MODULE ENG-I MINI FUSE ENGINE CONTROLS SYSTEM ENGINE CONTROLS SYSTEM SOUND SYSTEMS ENGINE CONTROLS SYSTEM ENGINE COOLANT TEMPERATURE SENDER (FRONT OF LEFT CYLINDER HEAD) FUEL GAUGE FUEL PUMP, SENDER (IN FUEL TANK) GAUGES FUSE 4 GEN WAIT TO GRY WIRE HEADLIGHTS SYSTEM HEADLIGHTS SYSTEM (DRL) HI BEAM HOT IN RUN OR START I/P FUSE BLOCK (BEHIND LEFT SIDE OF I/P) IGNITION SWITCH ILLUM INSTRUMENT CLUSTER LEFT TURN LOCK OFF W/ DRL ONLY LOW COOLANT LOW COOLANT LEVEL SENDER (IN COOLANT RESERVOIR) LOW ENGINE COOLANT LEVEL INDICATOR MODULE (UNDER CENTER OF I/P) LT BLU WIRE LT GRN WIRE LT GRN/BLK WIRE M/T PNK WIRE NCA WIRE OIL PRESS OIL PRESSURE SWITCH/SENDER (LEFT REAR TOP OF ENGINE) PARK BRAKE WARNING SWITCH (LEFT END OF I/P) PNK WIRE PPL PPL/WHT WIRE RIGHT TURN RUN WIRE SAFETY BELT SERVICE ENGINE SOON SERVICE THROTTLE SOON UP- SHIFT SPEED- OMETER STARTING/CHARGING SYSTEM SUPPLEMENTAL RESTRAINTS SYSTEM TACH VOLT- METER TAN WIRE TAN/ WHT WIRE TAN/BLK WIRE TAN/WHT WIRE TEMP GAUGE TRANS FUSE 20 TRANSMISSSION RANGE SELECTOR TRUNK, TAILGATE, FUEL DOORS SYSTEM TRUNK/TAIL- GATE/FUEL DOORS SYSTEM UNDERHOOD FUSE/RELAY CENTER (LEFT REAR OF ENGINE COMPT) VEHICLE SPEED SENSOR (LEFT REAR OF TRANSMISSION) VEHICLE SPEED SENSOR BUFFER (BEHIND RIGHT END OF I/P) W/O DRL ONLY WARNING SYSTEMS WATER IN FUEL WATER-IN FUEL SENSOR (TOP REAR OF ENGINE) WHT TAN/ WIRE WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE

A/T ACCY AIR BAG DAYTIME RUNNING LAMPS ANTI-LOCK BRAKES ANTI-LOCK BRAKES SYSTEM BLK WIRE BLK/ WHT WIRE BLK/WHT WIRE BRAKE PRESSURE WARNING SWITCH (ON REAR OF BRAKE PRESSURE MODULATOR VALVE BODY) BRAKE/ BRN WIRE BRN/WHT WIRE BULB TEST CHECK GAUGES CHECK GAUGES LAMP DRIVER CONVENIENCE CENTER (BEHIND LEFT SIDE OF I/P) DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE ELECTRONIC PRNDL DISPLAY MODULE ENGINE CONTROLS SYSTEM ENGINE CONTROLS SYSTEM SOUND SYSTEMS ENGINE CONTROLS SYSTEM ENGINE COOLANT TEMPERATURE SENDER (FRONT OF LEFT CYLINDER HEAD) FUEL GAUGE FUEL PUMP OIL PRESSURE SWITCH/SENDER (TOP REAR OF ENGINE) FUEL PUMP, SENDER (IN FUEL TANK) GAUGES FUSE 4 GEN GRY WIRE HEADLIGHTS SYSTEM HEADLIGHTS SYSTEM (DRL) HI BEAM HOT IN RUN OR START I/P FUSE BLOCK (BEHIND LEFT SIDE OF I/P) IGNITION SWITCH ILLUM INSTRUMENT CLUSTER LEFT TURN LOCK OFF LT BLU WIRE LT GRN WIRE LT GRN/BLK WIRE M/T PNK WIRE NCA WIRE OIL PRESS PARK BRAKE WARNING SWITCH (LEFT END OF I/P) PNK WIRE PPL PPL/WHT WIRE RIGHT TURN RUN WIRE SAFETY BELT SERVICE ENGINE SOON SPEED- OMETER STARTING/CHARGING SYSTEM SYSTEM SUPPLEMENTAL RESTRAINTS TACH VOLT- METER TAN WIRE TAN/ WHT WIRE TAN/BLK WIRE TAN/WHT WIRE TEMP GAUGE TRANS FUSE 20 TRANSMISSION RANGE SELECTOR (LEFT SIDE OF TRANSMISSION) TRUNK, TAILGATE, FUEL DOORS SYSTEM TRUNK/TAIL- GATE/FUEL DOORS SYSTEM UP SHIFT VEHICLE SPEED SENSOR (LEFT REAR OF TRANSMISSION) VEHICLE SPEED SENSOR BUFFER (BEHIND RIGHT END OF I/P) W/ DRL ONLY W/O DRL ONLY WARNING SYSTEMS WHT TAN/ WIRE WHT WIRE YEL WIRE

ACC-BATT CIRCUIT BREAKER BLK WIRE BLK/RED WIRE CARGO DOOR (SUBURBAN ONLY) CONTACTOR RIGHT REAR CONVENIENCE CENTER (UNDER LEFT SIDE OF I/P) DOOR LOCK RELAY FUSE BLOCK GRY WIRE HOT AT ALL TIMES LEFT FRONT DOOR LOCK MOTOR LEFT FRONT DOOR LOCK SWITCH LEFT REAR DOOR LOCK MOTOR RIGHT FRONT DOOR LOCK MOTOR LOCK LT BLU WIRE ORG/ WIRE ORG/BLK WIRE POWER MIRROR SYSTEM (IN-LINE FUSE) REAR CARGO DOOR LOCK MOTOR RIGHT FRONT DOOR LOCK MOTOR RIGHT FRONT DOOR LOCK SWITCH SUBURBAN ONLY TAN WIRE UNLOCK UNLOCK (BEHIND I/P, RIGHT SIDE OF BRAKE PEDAL BRACKET)

BACK BLK WIRE CONVENIENCE CENTER CONVENIENCE CENTER (UNDER LEFT SIDE OF I/P) DK BLU WIRE DK GRN WIRE DOWN DOWN ENTIRE SEAT ENTIRE SEAT DOWN FOR- WARD FORWARD/ REARWARD MOTOR REAR TILT MOTOR FRONT TILT MOTOR FUSE BLOCK HOT AT ALL TIMES ACC-BATT CIRCUIT BREAKER LT BLU WIRE ORG/BLK WIRE POWER SEAT SWITCH (LEFT SIDE OF DRIVER'S SEAT) REAR HEIGHT FRONT HEIGHT FRONT HEIGHT TAN WIRE UP REAR HEIGHT YEL WIRE

1-2 SHIFT SOL 2-3 SHIFT SOL 3-2 SHIFT SOL 2-3 SHIFT SOL CTRL FUEL INJ CTRL EGR SOL CTRL ENG SHUT-OFF CTRL 4 WHEEL DRIVE LOW SWITCH 983 474 PPL 999 998 961 452 PPL ACCELERATOR PEDAL POSITION (APP) MODULE (TOP OF ACCELERATOR BRACKET) ANTI-LOCK BRAKES SYSTEM APP 1 SENSOR ENGINE COOLANT TEMPERATURE (ECT) SENSOR (RIGHT SIDE OF ENGINE) APP 2 SENSOR APP 3 SENSOR B/H BATTERY FEED FWD LOW SW BLK WIRE BLK/WHT WIRE BLK/YEL WIRE BLU/WHT WIRE BRN WIRE BRN/WHT WIRE CRUISE CONTROL SYSTEM CRUISE ON/OFF SIG DATA LINK CONNECTOR (UNDER LEFT SIDE OF I/P) DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE ELECTRONIC 4-SPEED AUTOMATIC OVERDRIVE TRANSMISSION ENGINE SHUT- OFF SOLENOID (TOP FRONT OF ENGINE) F/SOL FUSE FUEL INJ CTRL FUEL SOLENOID (TOP FRONT OF ENGINE) FUEL SOLENOID DRIVER (TOP FRONT OF ENGINE) FUSE FUSE BLOCK FUSIBLE LINK GRY WIRE GRY/BLK WIRE GRY/RED WIRE HOT AT ALL TIMES HOT IN CRANK HOT IN RUN HOT IN START OR RUN LT BLU WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE MIL TCC SOL CTRL 1-2 SHIFT SOL CTRL RANGE SIGNAL A RANGE SIGNAL B RANGE SIGNAL C OPTICAL SENSOR AND FUEL TEMPER- ATURE SENSOR (TOP FRONT OF ENGINE) ORG/ WIRE ORG/BLK WIRE PNK WIRE POWERTRAIN CONTROL MODULE (PCM) (UNDER RIGHT END OF I/P) PPL PPL 15 16 PPL PNK WIRE PPL/WHT WIRE PRESSURE CONTROL SOL RANGE MODE SELECTOR RED WIRE RED/BLK WIRE RESUME/ACCEL SIG SET/COAST SIG SPEED SENSOR (LEFT REAR SIDE OF TRANSMISSION) SYSTEM GND CLOSURE SIG APP 2 SENS GND APP 1 SENS GND APP 3 SENS GND SENSOR GND TAN WIRE TAN/BLK WIRE TAN/WHT WIRE TCC BRAKE SW TCC SOL TRANS FLUID TEMP (TFT) SENSOR TRANS FUSE CRK FUSE TRANS INPUT SPD SIG CKP SIG OPTICAL SENS GND OPTICAL SENS CAM SIG TRANS OUTPUT TRANSMISSION INPUT SPEED SENSOR VEHICLE SPEED SENSOR BUFFER (UNDER RIGHT END OF I/P) VIN P ONLY VSS VSS HI RESOLUTION SIG VSS INPUT VSS OUTPUT WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE

1-2 SHIFT SOL 1222 1224 1225 1226 1350 PNK WIRE 2-3 SHIFT SOL CTRL FUEL INJ CTRL EGR SOL CTRL ENG SHUT-OFF CTRL 2-3 SHIFT SOL TCC SOL TRANS FLUID TEMP (TFT) SENSOR 4 WHEEL DRIVE LOW SWITCH 983 474 PPL 999 998 961 452 PPL ACCELERATOR PEDAL POSITION (APP) MODULE (TOP OF ACCELERATOR BRACKET) ANTI-LOCK BRAKES SYSTEM APP 1 SENSOR ENGINE COOLANT TEMPERATURE (ECT) SENSOR (RIGHT SIDE OF ENGINE) APP 3 SENSOR APP 2 SENSOR B/H BATTERY FEED FWD LOW SW BLK WIRE BLK/WHT WIRE BLK/YEL WIRE BLU/WHT WIRE BRN WIRE BRN/WHT WIRE CRUISE CONTROL SYSTEM CRUISE ON/OFF SIG DATA LINK CONNECTOR (UNDER LEFT SIDE OF I/P) DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE ELECTRONIC 4-SPEED AUTOMATIC OVERDRIVE TRANSMISSION ENGINE SHUT- OFF SOLENOID (TOP FRONT OF ENGINE) F/SOL FUSE FUEL INJ CTRL FUEL SOLENOID (TOP FRONT OF ENGINE) FUEL SOLENOID DRIVER (TOP FRONT OF ENGINE) FUSE FUSE BLOCK FUSIBLE LINK GRY WIRE GRY/BLK WIRE GRY/RED WIRE HOT AT ALL TIMES HOT IN CRANK HOT IN RUN HOT IN START OR RUN LT BLU WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE OPTICAL SENSOR AND FUEL TEMPER- ATURE SENSOR (TOP FRONT OF ENGINE) ORG/ WIRE ORG/BLK WIRE PNK WIRE POWERTRAIN CONTROL MODULE (PCM) (UNDER RIGHT END OF I/P) PPL PPL 15 16 PPL PNK WIRE PPL/WHT WIRE PRESSURE CONTROL SOL RANGE MODE SELECTOR RED WIRE RED/BLK WIRE RESUME/ACCEL SIG SET/COAST SIG SPEED SENSOR (LEFT REAR SIDE OF TRANSMISSION) SYSTEM GND CLOSURE SIG APP 2 SENS GND APP 1 SENS GND APP 3 SENS GND SENSOR GND TAN WIRE TAN/WHT WIRE TCC BRAKE SW TRANS FUSE CRK FUSE TRANS INPUT SPD SIG CKP SIG OPTICAL SENS GND OPTICAL SENS CAM SIG TRANS OUTPUT TRANSMISSION INPUT SPEED SENSOR VEHICLE SPEED SENSOR BUFFER (UNDER RIGHT END OF I/P) VIN P ONLY VSS VSS HI RESOLUTION SIG VSS INPUT VSS OUTPUT WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE