Chevrolet Chevy Express G1500 (1996-2012) hvac control assembly Wiring diagrams

A/C COMPRESSOR CLUTCH A/C COMPRESSOR CLUTCH RELAY (IN UNDERHOOD FUSE BLOCK) A/C HIGH PRESSURE SWITCH (REAR OF A/C A/C LOW PRESSURE SWITCH (IN REFRIGERANT BLK WIRE BRN WIRE CLUTCH RLY CTRL COMPRESSOR) DEFROST BLEND DIODE (IN UNDERHOOD FUSE BLOCK) DK GRN WIRE DK GRN/WHT WIRE HEAT A/C VENT BI-LEV HOT IN RUN HTR A/C FUSE 12 HOT IN RUN OR START HVAC CONTROL ASSEMBLY I/P FUSE BLOCK (LOWER LEFT KICK PANEL) IGN E FUSE LINE LOW PRESS SIG LT GRN WIRE OFF MAX ORG/ WIRE PNK WIRE POWERTRAIN CONTROL MODULE (PCM) (ON LEFT FRONT INNER FENDER) REQUEST SIG

AIR TEMPERATURE ACTUATOR (UNDER DASH, RIGHT SIDE OF HVAC PLENUM) AUXILIARY BLOWER MOTOR (IF EQUIPPED) (LEFT REAR OF CABIN, BEHIND REAR WHEELWELL) AUXILIARY BLOWER MOTOR SWITCH (IF EQUIPPED) BLK WIRE BLOWER FUSE BLOWER MOTOR (RIGHT REAR OF ENGINE COMPT) BRN WIRE CONVENIENCE CENTER DK BLU WIRE GRY WIRE HEAT BLEND DEF HOT AT ALL TIMES HOT IN RUN HOT IN RUN OR START HTR A/C FUSE 12 HVAC CONTROL ASSEMBLY I/P FUSE BLOCK (LOWER LEFT KICK PANEL) LT BLU WIRE MED LO OFF OFF VENT ORG/ WIRE PPL RED WIRE RR BLOWER FUSE RR HVAC FUSE 24 TAN WIRE UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) WHT WIRE YEL WIRE

A/C COMPRESSOR CLUTCH A/C COMPRESSOR CLUTCH RELAY (IN UNDERHOOD FUSE BLOCK) A/C FUSE A/C HIGH PRESSURE SWITCH (REAR OF A/C COMPRESSOR) AIR TEMPERATURE ACTUATOR (AUXILIARY) (LEFT REAR INTERIOR) AUXILIARY BLOWER MOTOR BLK WIRE BLOWER FUSE BLOWER MOTOR (RIGHT REAR OF ENGINE COMPT) BRN WIRE CLUTCH RLY CTRL CONVENIENCE CENTER DIODE (IN UNDERHOOD FUSE BLOCK) DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE GRY WIRE HOT AT ALL TIMES HOT IN RUN HOT IN RUN OR START HTR A/C FUSE 12 HVAC CONTROL ASSEMBLY HVAC CONTROL ASSEMBLY (FRONT AUXILIARY) (IF EQUIPPED) I/P FUSE BLOCK (LOWER LEFT KICK PANEL) LOW PRESS SIG LT BLU WIRE LT GRN WIRE MODE ACTUATOR (AUXILIARY) (LEFT REAR INTERIOR) OFF LO MED HI OFF MAX A/C BI-LEV ORG/ WIRE PNK WIRE POWERTRAIN CONTROL MODULE (PCM) (ON LEFT FRONT INNER FENDER) PPL RED WIRE REQUEST SIG RR BLOWER FUSE RR HVAC FUSE 24 TAN WIRE TEMP UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) IGN E FUSE VENT HEAT BLEND DEF VENT HEAT BLEND DEF OFF MAX A/C BI-LEV VENT MODE WHT WIRE YEL WIRE

A/C COMPRESSOR CLUTCH A/C COMPRESSOR ENABLE RELAY (IN UNDERHOOD FUSE BLOCK) A/C HIGH PRESSURE SWITCH (REAR OF A/C COMPRESSOR) AUXILIARY BLOWER MOTOR (BEHIND LEFT REAR WHEELHOUSE) BLK WIRE BLOWER FUSE BLOWER MOTOR (RIGHT REAR OF ENGINE COMPT) BRN WIRE CLUTCH RLY CTRL CONVENIENCE CENTER DIODE (IN UNDERHOOD FUSE BLOCK) DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE GRY WIRE HOT AT ALL TIMES HOT AT ALL TIMES HOT IN RUN OR START HOT IN RUN HTR A/C FUSE 12 HVAC CONTROL ASSEMBLY HVAC CONTROL ASSEMBLY (FRONT AUXILIARY) HVAC CONTROL ASSEMBLY (REAR AUXILIARY) HVAC CONTROL PROCESSOR AUXILIARY) (FRONT INTERIOR ROOF PANEL) I/P FUSE BLOCK (LOWER LEFT KICK PANEL) LOW PRESS SIG LT BLU WIRE LT GRN WIRE OFF LO MED HI OFF MAX A/C BI-LEV ORG/ WIRE PNK WIRE POWERTRAIN CONTROL MODULE (PCM) (ON LEFT FRONT INNER FENDER) PPL RED WIRE REQUEST SIG RR BLOWER FUSE RR CTRL OFF LO MED HI RR HVAC FUSE 24 TAN WIRE TEMP UNDER- HOOD FUSE BLOCK A/C FUSE IGN E FUSE UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) VENT HEAT BLEND DEF VENT HEAT BLEND DEF OFF MAX A/C BI-LEV VENT MODE WHT WIRE YEL WIRE

A/C COMPRESSOR CLUTCH A/C COMPRESSOR CLUTCH RELAY (IN UNDERHOOD FUSE BLOCK) A/C HIGH PRESSURE SWITCH (REAR OF A/C A/C LOW PRESSURE SWITCH (IN REFRIGERANT BLK WIRE BRN WIRE CLUTCH RLY CTRL COMPRESSOR) DEFROST BLEND DIODE (IN UNDERHOOD FUSE BLOCK) DK GRN WIRE DK GRN/WHT WIRE HEAT A/C VENT BI-LEV HOT IN RUN HTR A/C FUSE 12 HOT IN RUN OR START HVAC CONTROL ASSEMBLY I/P FUSE BLOCK (LOWER LEFT KICK PANEL) IGN E FUSE LINE LOW PRESS SIG LT GRN WIRE OFF MAX ORG/ WIRE PNK WIRE POWERTRAIN CONTROL MODULE (PCM) (ON LEFT FRONT INNER FENDER) REQUEST SIG

AIR TEMPERATURE ACTUATOR (UNDER DASH, RIGHT SIDE OF HVAC PLENUM) AUXILIARY BLOWER MOTOR (IF EQUIPPED) (LEFT REAR OF CABIN, BEHIND REAR WHEELWELL) AUXILIARY BLOWER MOTOR SWITCH (IF EQUIPPED) BLK WIRE BLOWER FUSE BLOWER MOTOR (RIGHT REAR OF ENGINE COMPT) BRN WIRE CONVENIENCE CENTER DK BLU WIRE GRY WIRE HEAT BLEND DEF HOT AT ALL TIMES HOT IN RUN HOT IN RUN OR START HTR A/C FUSE 12 HVAC CONTROL ASSEMBLY I/P FUSE BLOCK (LOWER LEFT KICK PANEL) LT BLU WIRE MED LO OFF OFF VENT ORG/ WIRE PPL RED WIRE RR BLOWER FUSE RR HVAC FUSE 24 TAN WIRE UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) WHT WIRE YEL WIRE

A/C COMPRESSOR CLUTCH A/C COMPRESSOR CLUTCH RELAY (IN UNDERHOOD FUSE BLOCK) A/C FUSE A/C HIGH PRESSURE SWITCH (REAR OF A/C COMPRESSOR) AIR TEMPERATURE ACTUATOR (AUXILIARY) (LEFT REAR INTERIOR) AUXILIARY BLOWER MOTOR BLK WIRE BLOWER FUSE BLOWER MOTOR (RIGHT REAR OF ENGINE COMPT) BRN WIRE CLUTCH RLY CTRL CONVENIENCE CENTER DIODE (IN UNDERHOOD FUSE BLOCK) DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE GRY WIRE HOT AT ALL TIMES HOT IN RUN HOT IN RUN OR START HTR A/C FUSE 12 HVAC CONTROL ASSEMBLY HVAC CONTROL ASSEMBLY (FRONT AUXILIARY) (IF EQUIPPED) I/P FUSE BLOCK (LOWER LEFT KICK PANEL) LOW PRESS SIG LT BLU WIRE LT GRN WIRE MODE ACTUATOR (AUXILIARY) (LEFT REAR INTERIOR) OFF LO MED HI OFF MAX A/C BI-LEV ORG/ WIRE PNK WIRE POWERTRAIN CONTROL MODULE (PCM) (ON LEFT FRONT INNER FENDER) PPL RED WIRE REQUEST SIG RR BLOWER FUSE RR HVAC FUSE 24 TAN WIRE TEMP UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) IGN E FUSE VENT HEAT BLEND DEF VENT HEAT BLEND DEF OFF MAX A/C BI-LEV VENT MODE WHT WIRE YEL WIRE

A/C COMPRESSOR CLUTCH A/C COMPRESSOR ENABLE RELAY (IN UNDERHOOD FUSE BLOCK) A/C HIGH PRESSURE SWITCH (REAR OF A/C COMPRESSOR) AUXILIARY BLOWER MOTOR (BEHIND LEFT REAR WHEELHOUSE) BLK WIRE BLOWER FUSE BLOWER MOTOR (RIGHT REAR OF ENGINE COMPT) BRN WIRE CLUTCH RLY CTRL CONVENIENCE CENTER DIODE (IN UNDERHOOD FUSE BLOCK) DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE GRY WIRE HOT AT ALL TIMES HOT AT ALL TIMES HOT IN RUN OR START HOT IN RUN HTR A/C FUSE 12 HVAC CONTROL ASSEMBLY HVAC CONTROL ASSEMBLY (FRONT AUXILIARY) HVAC CONTROL ASSEMBLY (REAR AUXILIARY) HVAC CONTROL PROCESSOR AUXILIARY) (FRONT INTERIOR ROOF PANEL) I/P FUSE BLOCK (LOWER LEFT KICK PANEL) LOW PRESS SIG LT BLU WIRE LT GRN WIRE OFF LO MED HI OFF MAX A/C BI-LEV ORG/ WIRE PNK WIRE POWERTRAIN CONTROL MODULE (PCM) (ON LEFT FRONT INNER FENDER) PPL RED WIRE REQUEST SIG RR BLOWER FUSE RR CTRL OFF LO MED HI RR HVAC FUSE 24 TAN WIRE TEMP UNDER- HOOD FUSE BLOCK A/C FUSE IGN E FUSE UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) VENT HEAT BLEND DEF VENT HEAT BLEND DEF OFF MAX A/C BI-LEV VENT MODE WHT WIRE YEL WIRE

6.6L 4.3L 4.8L, 5.3L, 6.0L 8 9 2500 2501 GMLAN (+) GMLAN (-) A/C CMPRSR FUSE 18 A/C COMPRSR RELAY 40 A/C LOW PRESSURE SWITCH (ON SIDE OF ACCUMULATOR) A/C REFRIGERANT PRESSURE SENSOR A/C REQUEST SIG BLK WIRE BODY CONTROL MODULE (BCM) (BEHIND LOWER RIGHT SIDE OF DASH) BODY FUSE BLOCK (UNDER LEFT FRONT SEAT) BRN WIRE COMPUTER DATA LINES SYSTEM DEF MAX A/C MIX-BLEND A/C FLOOR BI-LEV VENT LOGIC DEFOGGER, POWER MIRRORS DK GRN WIRE DK GRN/WHT WIRE ENGINE CONTROL MODULE (ECM) (LEFT SIDE OF ENGINE COMPT) GMLAN - GMLAN + GRY WIRE HOT AT ALL TIMES HOT W/ RUN/ HVAC 2 FUSE 13 HVAC CONTROL ASSEMBLY LT GRN WIRE OFF ORG/BLK WIRE TAN WIRE TAN/BLK WIRE UNDERHOOD FUSE BLOCK (ON LEFT SIDE OF ENGINE COMPT) W/ ELECTRIC REAR WINDOW

2501 2500 2501 2500 COMPUTER DATA LINES SYSTEM AIR TEMPERATURE ACTUATOR (BEHIND RIGHT SIDE OF DASH, ON HVAC) AUXILIARY BLOWER MOTOR (IF EQUIPPED) AUXILIARY BLOWER MOTOR LOW SPEED RELAY (IF EQUIPPED) (LEFT REAR OF PASSENGER AUXILIARY BLOWER MOTOR MEDIUM SPEED RELAY AUXILIARY BLOWER MOTOR RESISTOR ASSEMBLY (IF EQUIPPED) AUXILIARY BLOWER MOTOR SWITCH (IF EQUIPPED) BLK WIRE BLOWER MOTOR (ON RIGHT REAR OF ENGINE COMPT, ON EVAPORATOR CASE) BODY CONTROL MODULE (BCM) (BEHIND LOWER RIGHT SIDE OF DASH) BODY FUSE BLOCK (UNDER LEFT FRONT SEAT) BREAKOUT) BRN WIRE BRN/WHT WIRE COMPT, ATTACHED TO AUXILIARY HVAC MODULE) CONNECTOR BREAKOUT) COOLANT HEATER BLOWER MOTOR GND COOLANT HEATER COMBUSTION SENSOR LOW REF COOLANT HEATER CONTROL MODULE COOLANT HEATER GLOW PLUG VOLT DK BLU WIRE DK BLU/LT GRN WIRE FOH MDL (D) FUSE 35 FROM AUXILIARY BLOWER MOTOR BREAKOUT) GND SERIAL - SERIAL + SERIAL - SERIAL + GRN/RED WIRE HOT AT ALL TIMES HOT W/ RUN/ HVAC 1 FUSE 14 HVAC 2 FUSE 13 HVAC CONTROL ASSEMBLY LOGIC 8 10 7 LT BLU WIRE MAX A/C OFF A/C BI-LEV MED LO OFF OF ENGINE BLOCK) ORG/ WIRE REAR BLWR FUSE 29 RED WIRE RED/BLK WIRE RED/WHT WIRE REF SER DATA TAN WIRE TAN/BLK WIRE VACUUM PUMP (6.6L) (RIGHT FRONT OF ENGINE COMPT, UNDER BATTERY) VENT FLOOR MIX-BLEND DEF VOLT W/ AUXILIARY FUEL FIRED HEATER W/O AUXILIARY FUEL FIRED HEATER WHT WIRE YEL WIRE