GMC Sierra 2500 HD (2002-2012) manual a/c automatic a/c Wiring diagrams

2500 2501 COMPUTER DATA LINES SYSTEM 66 46 SERIAL DATA + SERIAL DATA - BLK WIRE BLK/WHT WIRE BRN/WHT WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE DK GRN WIRE DRIVER INFORMATION CENTER (DIC) DISPLAY ECT SENS SIG ENGINE CONTROL MODULE (ECM) (LEFT FRONT OF ENGINE COMPT, NEAR FAN SHROUD) ENGINE COOLANT LEVEL SWITCH (ON BOTTOM OF SURGE TANK) ENGINE COOLANT TEMPERATURE (ECT) SENSOR (TOP FRONT CENTER OF ENGINE) ENGINE COOLING FAN (FRONT CENTER OF ENGINE COMPT) FAN FUSE 68 FAN RLY RELAY GRY WIRE HOT AT ALL TIMES HVAC CONTROL MODULE INSTRUMENT PANEL CLUSTER (IPC) LOGIC LOGIC B+ GND LOW REF LT GRN WIRE MANUAL A/C AUTOMATIC A/C RLY SPD SIG SERIAL DATA SPD SIG SW SIG TAN WIRE TAN/BLK WIRE UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) WHT WIRE WHT/BLK WIRE YEL WIRE

2500 2501 COMPUTER DATA LINES SYSTEM 66 46 SERIAL DATA + SERIAL DATA - BLK WIRE BLK/WHT WIRE BRN/WHT WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE DK GRN WIRE DRIVER INFORMATION CENTER (DIC) DISPLAY ECT SENS SIG ENGINE CONTROL MODULE (ECM) (LEFT FRONT OF ENGINE COMPT, NEAR FAN SHROUD) ENGINE COOLANT LEVEL SWITCH (ON BOTTOM OF SURGE TANK) ENGINE COOLANT TEMPERATURE (ECT) SENSOR (TOP FRONT CENTER OF ENGINE) ENGINE COOLING FAN (FRONT CENTER OF ENGINE COMPT) FAN FUSE 68 FAN RLY RELAY GRY WIRE HOT AT ALL TIMES HVAC CONTROL MODULE INSTRUMENT PANEL CLUSTER (IPC) LOGIC LOGIC B+ GND LOW REF LT GRN WIRE MANUAL A/C AUTOMATIC A/C RLY SPD SIG SERIAL DATA SPD SIG SW SIG TAN WIRE TAN/BLK WIRE UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) WHT WIRE WHT/BLK WIRE YEL WIRE

1 5 B(+) GMLAN L 2501 2500 COMPUTER DATA LINES SYSTEM 3340 5060 COMPUTER DATA LINES SYSTEM 4.3L 6.6L EXCEPT 4.3L, 6.6L 4.3L A/C CMPRSR FUSE 17 (EXCEPT 6.6L) FUSE 16 (6.6L) A/C CMPRSR RELAY A/C IND A/C ON A/C REFRIGERANT PRESSURE SENSOR (NEAR COMPRESSOR, ON A/C HIGH PRESSURE HOSE) BLK WIRE DK GRN WIRE DK GRN/WHT WIRE ENGINE CONTROL MODULE (ECM) (LEFT FRONT OF ENGINE COMPT, NEAR FAN SHROUD) GROUND GRY WIRE HOT AT ALL TIMES HVAC BATT FUSE 39 (EXCEPT 6.6L) FUSE 36 (6.6L) HVAC CONTROL MODULE LOGIC MANUAL A/C AUTOMATIC A/C ORG/BLK WIRE RED/WHT WIRE TAN WIRE TAN/BLK WIRE UNDER- HOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT)

2500 2501 COMPUTER DATA LINES SYSTEM 66 46 DATA BUS + DATA BUS - BLK WIRE BLK/WHT WIRE BRN/WHT WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE DK GRN WIRE DRIVER INFORMATION CENTER (DIC) DISPLAY ECT SENS SIG ENGINE CONTROL MODULE (ECM) (LEFT FRONT OF ENGINE COMPT, NEAR FAN SHROUD) ENGINE COOLANT LEVEL SWITCH (ON BOTTOM OF SURGE TANK) ENGINE COOLANT TEMPERATURE (ECT) SENSOR (TOP FRONT CENTER OF ENGINE) ENGINE COOLING FAN (FRONT CENTER OF ENGINE COMPT) FAN FUSE 68 FAN RLY RELAY GMLAN L GRY WIRE HOT AT ALL TIMES HVAC CONTROL MODULE INSTRUMENT PANEL CLUSTER (IPC) LOGIC LOGIC B+ GND LOW REF LT GRN WIRE MANUAL A/C AUTOMATIC A/C RLY SPD SIG SERIAL DATA SPD SIG SW SIG TAN WIRE TAN/BLK WIRE UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) WHT WIRE WHT/BLK WIRE YEL WIRE

17 12 8 11 HDLP OFF HDLP ON PRK LMP AMB LGHT 18 25 HDLP DIM SW SIG FLASH TO PASS 23 11 DRL RLY FOG LMP RLY BLK GRN/ LT WIRE BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (BCM) (LOWER LEFT SIDE OF DASH) COMPUTER DATA LINES SYSTEM DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE DRL 2 FUSE 33 FUSE 30 DRL FUSE 31 FUSE 28 DRL PCB RELAY FLASH TO PASS SWITCH FOG LAMP FUSE 26 FUSE 25 FOG LAMP GMLAN SERIAL DATA IND FOG LAMP RELAY FOG LP SW FOG SWITCH GAS DIESEL GMC CHEVROLET GRY (OR BLK) WIRE HDLP LO/HID RELAY HEAD PARK AUTO HEADLAMP DIMMER SWITCH HEADLAMP, PANEL DIMMER SWITCH HI BEAM PCB RELAY HI BEAM RLY HI HEAD- LAMP LT FUSE 32 FUSE 29 HI HEAD- LAMP RT FUSE 30 FUSE 21 HI-BEAM IND HOT AT ALL TIMES HOT W/ RUN/ CRANK RELAY ENERGIZED INSTRUMENT PANEL CLUSTER (IPC) IPC FUSE 46 FUSE 43 LEFT FRONT FOG LAMP LEFT HIGH BEAM HEADLAMP LEFT I/P JUNCTION BOX (LOWER LEFT SIDE OF DASH) LEFT LOW BEAM HEADLAMP LO BEAM RLY LO HDLP LT FUSE 12 LO HDLP RT FUSE 16 FUSE 15 LOGIC LT BLU WIRE LT GRN/BLK WIRE MANUAL A/C AUTOMATIC A/C OFF OFF HEAD ORG/ WIRE PARK AUTO PARK BRAKE SWITCH (ON PARK BRAKE PEDAL ASSEMBLY) PK BRAKE SIG PNK/WHT WIRE PPL RED/WHT WIRE RIGHT FRONT FOG LAMP RIGHT HIGH BEAM HEADLAMP RIGHT LOW BEAM HEADLAMP TAN/WHT WIRE TURN SIGNAL/ MULTI-FUNCTION SWITCH UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) WHT GRN/ DK WIRE WHT WIRE YEL WIRE YEL/BLK WIRE

BLK WIRE BLK/WHT WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE DRL FUSE 31 FUSE 28 DRL PCB RELAY FOG LAMP FUSE 26 FUSE 25 FOG LAMP IND FOG LAMP RELAY FOG LAMP SWITCH FROM HDLP LO/HID RELAY (DIAGRAM 1 OF 2) GASOLINE DIESEL GMLAN SERIAL DATA GROUND DISTRIBUTION HEAD PARK AUTO HEADLAMP, PANEL DIMMER SWITCH HI-BEAM IND INSTRUMENT PANEL CLUSTER (IPC) IPC FUSE 46 FUSE 43 LEFT FRONT FOG LAMP (IF EQUIPPED) LEFT I/P JUNCTION BLOCK (LOWER LEFT SIDE OF DASH) LOGIC LT BLU WIRE LT GRN/BLK WIRE MANUAL A/C AUTOMATIC A/C OFF OFF HEAD ORG/ WIRE PARK AUTO PARK BRAKE SWITCH (ON PARK BRAKE PEDAL ASSEMBLY) POWER DISTRIBUTION SYSTEM PPL RED/WHT WIRE RIGHT FRONT FOG LAMP SYSTEM UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) WHT WIRE

6.6L EXCEPT 6.6L, 4.3L 4.3L BLK WIRE DRIVER OUTSIDE REARVIEW MIRROR EXCEPT 6.6L 6.6L HOT AT ALL TIMES HTD MIR FUSE 53 FUSE 51 LOGIC HVAC CONTROL MODULE MANUAL A/C AUTOMATIC A/C NCA WIRE ORG/ WIRE PASSENGER OUTSIDE REARVIEW MIRROR POWER DISTRIBUTION SYSTEM REAR DEFOG RELAY REAR DEFOGGER IND REAR DEFOGGER SWITCH RED WIRE RED/BLK WIRE UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) WHT WIRE

6.6L EXCEPT 6.6L, 4.3L 4.3L BLK WIRE DRIVER OUTSIDE REARVIEW MIRROR EXCEPT 6.6L 6.6L HOT AT ALL TIMES HTD MIR FUSE 53 FUSE 51 LOGIC HVAC CONTROL MODULE MANUAL A/C AUTOMATIC A/C NCA WIRE ORG/ WIRE PASSENGER OUTSIDE REARVIEW MIRROR REAR DEFOG RELAY REAR DEFOGGER IND REAR DEFOGGER SWITCH UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) WHT WIRE

6.6L EXCEPT 6.6L, 4.3L 4.3L BLK WIRE DRIVER OUTSIDE REARVIEW MIRROR EXCEPT 6.6L 6.6L HOT AT ALL TIMES HTD MIR FUSE 53 FUSE 51 LOGIC HVAC CONTROL MODULE MANUAL A/C AUTOMATIC A/C NCA WIRE ORG/ WIRE PASSENGER OUTSIDE REARVIEW MIRROR POWER DISTRIBUTION SYSTEM REAR DEFOG RELAY REAR DEFOGGER IND REAR DEFOGGER SWITCH RED WIRE RED/BLK WIRE UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) WHT WIRE

6.6L EXCEPT 6.6L, 4.3L 4.3L BLK WIRE EXCEPT 6.6L 6.6L LOGIC HVAC CONTROL MODULE MANUAL A/C AUTOMATIC A/C POWER DISTRIBUTION SYSTEM PPL REAR DEFOG FUSE 50 FUSE 47 REAR DEFOG RELAY REAR DEFOGGER IND REAR DEFOGGER SWITCH REAR WINDOW DEFOGGER GRID RED WIRE RED/BLK WIRE UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) WHT WIRE