GMC Suburban C2500 (1985-1999) org/ Wiring diagrams

1 2 3 4 5 6 7 8 9 10 ILLUMINATION GROUND AIR TEMP DR SENSOR MODE SIGNAL BATTERY IGNITION GROUND DEFOGGER ELEMENT BLK WIRE BLOWER FUSE 3 BLOWER MOTOR (UNDER RIGHT SIDE OF DASH) BLOWER RESISTOR (ON BLOWER MOTOR HOUSING) BLOWER SWITCH BRN WIRE DK BLU WIRE DK GRN WIRE FRONT MODE DOOR MOTOR (ON FRONT A/C-HEATER HOUSING) FRONT TEMPERATURE DOOR MOTOR (ON FRONT A/C-HEATER HOUSING) FUSE BLOCK GRY WIRE HIGH BLOWER RELAY (ON TOP OF FRONT A/C- HEATER BLOWER HOUSING) HOT AT ALL TIMES HOT IN RUN HTR A/C FUSE 12 HVAC CONTROL MODULE LT BLU WIRE OFF LO ORG/ WIRE PPL REAR DEFOGGER SYSTEM RECIRC CTRL IGNITION RECIRCULATION DOOR MOTOR (ON FRONT A/C-HEATER HOUSING) RED WIRE TAN WIRE UNDERHOOD FUSE/RELAY CENTER WHT WIRE YEL WIRE

1 2 3 4 5 6 7 8 9 10 ILLUMINATION GROUND 1995 VFTC AIR TEMP DR SENSOR MODE SIGNAL AUXILIARY BLOWER MOTOR AUXILIARY BLOWER MOTOR RELAY, HIGH (ON AUXILIARY A/C PLENUM) AUXILIARY BLOWER MOTOR RELAY, LOW (ON AUXILIARY A/C PLENUM) AUXILIARY BLOWER MOTOR RELAY, MEDIUM (ON AUXILIARY A/C PLENUM) AUXILIARY BLOWER MOTOR RESISTOR (ON AUXILIARY A/C PLENUM) AUXILIARY HEATER CONTROL MODULE (REAR) (BEHIND LEFT SIDE OF DASH) BATTERY IGNITION GROUND DEFOGGER ELEMENT BLK WIRE BLOWER FUSE 3 BLOWER MOTOR (UNDER RIGHT SIDE OF DASH) BLOWER RESISTOR (ON BLOWER MOTOR HOUSING) BLOWER SWITCH BRN WIRE CONVENIENCE CENTER DK BLU WIRE DK GRN WIRE GRY WIRE HIGH BLOWER RELAY (ON TOP OF FRONT A/C- HEATER BLOWER HOUSING) HOT AT ALL TIMES HOT IN RUN HTR A/C FUSE 12 HVAC CONTROL MODULE I/P FUSE BLOCK LT BLU WIRE MEGA FUSE BLOCK OFF LO OFF LOW MED HIGH ORG/ WIRE PPL REAR DEFOGGER SYSTEM REAR OFF LOW MED HIGH RECIRC CTRL IGNITION RECIRCULATION DOOR MOTOR (ON FRONT A/C-HEATER HOUSING) RED WIRE RR HVAC FUSE 5 TAN WIRE WHT WIRE YEL WIRE

1 2 3 4 5 6 7 8 9 10 ILLUMINATION GROUND A/C DISABLE RECIRC DOOR SIGNAL IGNITION A/C COMPRESSOR CLUTCH A/C COMPRESSOR CLUTCH RELAY (IN UNDERHOOD FUSE/RELAY CENTER) A/C COMPRESSOR CYCLING SWITCH (IN LOW PRESSURE LINE, ON ACCUMULATOR) A/C CTRL A/C HIGH PRESSURE CUTOUT SWITCH (ON A/C COMPRESSOR) A/C LOW PRESSURE CUTOUT SWITCH (ON A/C COMPRESSOR) A/C REQ AIR TEMP DR SENSOR MODE SIGNAL A/C SWITCH AUX FAN FUSE AUXILIARY COOLING FAN MOTOR AUXILIARY COOLING FAN RELAY (EXC 4.3L) (IN UNDERHOOD FUSE/RELAY CENTER) BATTERY IGNITION GROUND DEFOGGER ELEMENT BLK WIRE BLK/WHT WIRE BLOWER MOTOR (UNDER RIGHT SIDE OF DASH) BLOWER RESISTOR (ON BLOWER MOTOR HOUSING) BLOWER SWITCH BRN WIRE DIODE DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE FRONT RECIRCULATION DOOR MOTOR (ON FRONT A/C-HEATER HOUSING) FUSE BLOCK GRY WIRE HIGH BLOWER RELAY (ON TOP OF FRONT A/C-HEATER HOUSING) HOT AT ALL TIMES HOT AT ALL TIMES UNDERHOOD BLOWER FUSE 3 FUSE BLOCK HOT IN RUN HOT IN RUN OR START HTR A/C FUSE 12 HVAC CONTROL MODULE IGN E FUSE A/C COMP FUSE LT BLU WIRE LT GRN WIRE OFF LO ORG/ WIRE PNK WIRE PPL REAR DEFOGGER SYSTEM RED WIRE SW SIG SW SIG RELAY CTRL TAN WIRE UNDERHOOD FUSE BLOCK VEHICLE CONTROL MODULE (LEFT SIDE OF ENGINE COMPT) WHT WIRE YEL WIRE

1 2 3 4 5 6 7 8 9 10 ILLUMINATION GROUND A/C DISABLE RECIRC CTRL IGNITION 1995 VFTC A/C COMPRESSOR CLUTCH A/C COMPRESSOR CLUTCH DIODE A/C COMPRESSOR CLUTCH RELAY (IN UNDERHOOD FUSE BOX) A/C COMPRESSOR CYCLING SWITCH (ON TOP OF ACCUMULATOR) A/C COMPRESSOR HIGH PRESSURE CUTOUT SWITCH (REAR OF THE A/C COMPRESSOR) A/C COMPRESSOR LOW PRESSURE CUTOUT SWITCH (ON TOP OF A/C COMPRESSOR) A/C FUSE A/C REQUEST AIR TEMP DR SENSOR MODE SIGNAL A/C REQUEST AUX FAN FUSE AUXILIARY COOLING FAN MOTOR AUXILIARY COOLING FAN RELAY (IN UNDERHOOD FUSE/RELAY CENTER) BATTERY IGNITION GROUND DEFOGGER ELEMENT BLK WIRE BLK/WHT WIRE BLOWER FUSE 3 BLOWER MOTOR (UNDER RIGHT SIDE OF DASH) BLOWER RESISTOR (ON BLOWER MOTOR HOUSING) BLOWER SWITCH OFF LO BRN WIRE DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE GRY WIRE HIGH BLOWER RELAY (ON TOP OF FRONT A/C- HEATER BLOWER HOUSING) HOT AT ALL TIMES HOT IN RUN HOT IN RUN I/P IGN E FUSE FUSE BLOCK HTR A/C FUSE 12 HVAC CONTROL MODULE LT BLU WIRE LT GRN WIRE ORG/ WIRE PNK WIRE PPL REAR DEFOGGER SYSTEM RECIRCULATION DOOR MOTOR (ON FRONT A/C-HEATER HOUSING) RED WIRE RELAY CONTROL SWITCH SIGNAL TAN WIRE UNDERHOOD FUSE BLOCK VEHICLE CONTROL MODULE (ENGINE COMPARTMENT NEAR EBCM) WHT WIRE YEL WIRE

10 8 7 B+ SIGNAL GROUND AUXILIARY A/C, HEATER CONTROL MODULE (REAR) (BEHIND LEFT SIDE OF DASH) AUXILIARY A/C, HEATER LOGIC MODULE (BEHIND LEFT SIDE OF DASH) AUXILIARY BLOWER MOTOR (BEHIND RIGHT REAR WHEELWELL) AUXILIARY BLOWER MOTOR RELAY (HIGH) AUXILIARY BLOWER MOTOR RELAY (LOW) (ON AUXILIARY A/C-HEATER BLOWER HOUSING) AUXILIARY BLOWER MOTOR RELAY (MEDIUM) AUXILIARY BLOWER RESISTOR (ON TOP OF AUXILIARY HVAC PLENUM) BLK WIRE BRN WIRE CONVENIENCE CENTER DK BLU WIRE GROUND HOT IN RUN HOUSING) I/P FUSE BLOCK LT BLU WIRE MODE MODE DOOR MOTOR (REAR) (ON REAR A/C HOUSING) OFF LOW MED HIGH ORG/ WIRE REAR OFF LOW MED HIGH RED WIRE RR HVAC FUSE 5 TEMP TEMP DOOR MOTOR (REAR) (ON REAR A/C HOUSING) WHT WIRE YEL WIRE

1 2 3 4 5 6 7 8 9 10 ILLUMINATION GROUND A/C DISABLE RECIRC SIGNAL IGNITION A/C COMP FUSE A/C COMPRESSOR CLUTCH A/C COMPRESSOR CLUTCH RELAY (IN UNDERHOOD FUSE CENTER) A/C COMPRESSOR CYCLING SWITCH (IN LOW PRESSURE LINE, ON ACCUMULATOR) A/C CTRL A/C ENABLE A/C HIGH PRESSURE CUTOUT SWITCH (ON A/C COMPRESSOR) A/C LOW PRESSURE CUTOUT SWITCH (ON A/C COMPRESSOR) AIR TEMP DR SIGNAL MODE SIGNAL A/C SWITCH BATTERY IGNITION GROUND DEFOGGER ELEMENT BLK WIRE BLOWER FUSE 3 BLOWER MOTOR BLOWER RESISTOR (UNDER RIGHT SIDE OF DASH, ON HEATER HOUSING) BLOWER SWITCH BRN WIRE DIODE DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE FRONT MODE DOOR MOTOR (ON FRONT A/C-HEATER HOUSING) FRONT TEMPERATURE DOOR MOTOR (ON FRONT A/C-HEATER HOUSING) FUSE BLOCK GRY WIRE HEATER AND A/C CONTROL MODULE HIGH BLOWER RELAY (UNDER DASH ON TOP OF HEATER-A/C HOUSING) HOT AT ALL TIMES UNDERHOOD FUSE BLOCK HOT IN RUN HOT IN RUN OR START HTR A/C FUSE 12 IGN E FUSE LT BLU WIRE LT GRN WIRE OFF LO ORG/ WIRE PNK WIRE POWERTRAIN CONTROL MODULE (BEHIND RIGHT SIDE OF DASH) PPL REAR DEFOGGER SYSTEM RECIRCULATION DOOR MOTOR (UNDER DASH ON HEATER- A/C HOUSING) RED WIRE TAN WIRE WHT WIRE YEL WIRE

1 2 3 4 5 6 7 8 9 10 ILLUMINATION GROUND A/C DISABLE RECIRC CTRL IGNITION 1995 VFTC A/C COMPRESSOR CLUTCH A/C COMPRESSOR CLUTCH DIODE A/C COMPRESSOR CLUTCH RELAY (IN UNDERHOOD FUSE/RELAY CENTER) A/C COMPRESSOR CYCLING SWITCH (ON TOP OF ACCUMULATOR) A/C COMPRESSOR HIGH PRESSURE CUTOUT SWITCH (REAR OF THE A/C COMPRESSOR) A/C COMPRESSOR LOW PRESSURE CUTOUT SWITCH (ON TOP OF A/C COMPRESSOR) A/C FUSE AIR TEMP DR SENSOR MODE SIGNAL A/C REQUEST AUX FAN FUSE AUXILIARY COOLING FAN MOTOR AUXILIARY COOLING FAN RELAY (IN UNDERHOOD FUSE/RELAY CENTER) BATTERY IGNITION GROUND DEFOGGER ELEMENT BLK WIRE BLK/WHT WIRE BLOWER FUSE 3 BLOWER MOTOR (UNDER RIGHT SIDE OF DASH) BLOWER RESISTOR (ON BLOWER MOTOR HOUSING) BLOWER SWITCH OFF LO BRN WIRE DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE GRY WIRE HIGH BLOWER RELAY (ON TOP OF FRONT A/C- HEATER BLOWER HOUSING) HOT AT ALL TIMES HOT IN RUN HOT IN RUN I/P IGN E FUSE FUSE BLOCK HTR A/C FUSE 12 HVAC CONTROL MODULE LT BLU WIRE LT GRN WIRE ORG/ WIRE PNK WIRE PPL REAR DEFOGGER SYSTEM RECIRCULATION DOOR MOTOR (ON FRONT A/C-HEATER HOUSING) RED WIRE RELAY CONTROL SWITCH SIGNAL TAN WIRE UNDERHOOD FUSE BLOCK VEHICLE CONTROL MODULE (ON LEFT SIDE OF ENGINE COMPARTMENT) WHT WIRE YEL WIRE

10 8 7 B+ SIGNAL GROUND 1995 VFTC AUXILIARY A/C, HEATER CONTROL MODULE (REAR) (BEHIND LEFT SIDE OF DASH) AUXILIARY A/C, HEATER LOGIC MODULE (BEHIND LEFT SIDE OF DASH) AUXILIARY BLOWER MOTOR (BEHIND RIGHT REAR WHEELWELL) AUXILIARY BLOWER MOTOR RELAY (MEDIUM) AUXILIARY BLOWER RESISTOR (ON TOP OF AUXILIARY HVAC PLENUM) BLK WIRE BRN WIRE CONVENIENCE CENTER DK BLU WIRE GROUND HOT IN RUN I/P FUSE BLOCK LT BLU WIRE MODE MODE DOOR MOTOR (REAR) (ON REAR A/C HOUSING) OFF LOW MED HIGH ORG/ WIRE REAR OFF LOW MED HIGH RED WIRE RR HVAC FUSE 5 TEMP TEMP DOOR MOTOR (REAR) (ON REAR A/C HOUSING) WHT WIRE YEL WIRE

1 2 3 4 5 6 7 8 9 10 ILLUMINATION GROUND AIR TEMP DR SENSOR MODE SIGNAL BATTERY IGNITION GROUND DEFOGGER ELEMENT BLK WIRE BLOWER FUSE 3 BLOWER MOTOR (UNDER RIGHT SIDE OF DASH) BLOWER RESISTOR (ON BLOWER MOTOR HOUSING) BLOWER SWITCH BRN WIRE DK BLU WIRE DK GRN WIRE FRONT MODE DOOR MOTOR (ON FRONT A/C-HEATER HOUSING) FRONT TEMPERATURE DOOR MOTOR (ON FRONT A/C-HEATER HOUSING) FUSE BLOCK GRY WIRE HIGH BLOWER RELAY (ON TOP OF FRONT A/C- HEATER BLOWER HOUSING) HOT AT ALL TIMES HOT IN RUN HTR A/C FUSE 12 HVAC CONTROL MODULE LT BLU WIRE OFF LO ORG/ WIRE PPL REAR DEFOGGER SYSTEM RECIRC CTRL IGNITION RECIRCULATION DOOR MOTOR (ON FRONT A/C-HEATER HOUSING) RED WIRE TAN WIRE UNDERHOOD FUSE/RELAY CENTER WHT WIRE YEL WIRE

BLK WIRE CIG LTR FUSE 13 CONVENIENCE CENTER (UNDER LEFT SIDE OF DASH) HOT AT ALL TIMES I/P FUSE BLOCK LEFT POWER LUMBAR SEAT SWITCH ORG/ WIRE PNK WIRE POWER LUMBAR MOTOR RIGHT POWER LUMBAR SEAT SWITCH SUBURBAN, UTILITY ONLY