GMC Sierra 3500 HD (2007-2012) low ref Wiring diagrams

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 AIR TMP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 B(+) A/C ON AIR TEMP RF SUNLD AMB AIR TMP GMLAN L AMBIENT AIR TEMPERATURE SENSOR (ON LEFT SIDE OF RADIATOR SUPPORT) AMBIENT LIGHT/SUNLOAD SENSOR ASSEMBLY (TOP CENTER OF DASH) AUTO BATT POS VOLT BLK WIRE BLK/WHT WIRE BREAKOUT) BRN WIRE COLNT LVL GROUND LOW REF COMPUTER DATA LINES SYSTEM DK BLU WIRE DK GRN WIRE ENGINE COOLANT LEVEL SWITCH (6.6L) (ON BOTTOM OF SURGE TANK) EVAPORATOR TEMPERATURE SENSOR (ON HVAC ASSEMBLY) FAN DN FAN UP FRESH AIR FRNT DFG FRT DEF A/C IND FSH AIR GROUND GROUND DISTRIBUTION SYSTEM GROUND IGN 3 REAR DEFOG GRY WIRE GRY/BLK WIRE HVAC CONTROL MODULE INSTRUMENT PANEL CLUSTER (IPC) DRIVER INFORMATION CENTER (DIC) DISPLAY LEFT I/P JUNCTION BLOCK (LOWER LEFT SIDE OF DASH) LEFT SUNLOAD SENSOR LEFT TEMP CONTROL LF SUNLD L AIR TMP R AIR TMP LOGIC LOW REF LT BLU WIRE LT BLU/BLK WIRE LT GRN WIRE LT GRN/BLK WIRE MODE DN MODE UP MTR SPD CTRL OFF ORG/ WIRE POWER DISTRIBUTION SYSTEM DEFOGGER SYSTEM PPL PPL/WHT WIRE R AIR TMP AIR TMP R AIR TMP TEMP SENS MODE CTRL L AIR TMP RECIR CTRL R AIR TMP REAR DFG RECIR RECIRC RED WIRE RED/WHT WIRE RER DEF RIGHT I/P JUNCTION BLOCK (IN RIGHT END OF DASH) RIGHT SUNLOAD SENSOR RIGHT TEMP CONTROL SERIAL DATA TAN WIRE UPPER LEFT AIR TEMPERATURE SENSOR (UNDER UPPER LEFT SIDE OF DASH) UPPER RIGHT AIR TEMPERATURE SENSOR (UNDER UPPER RIGHT SIDE OF DASH) WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE

ACCESSORY WAKEUP SERIAL DATA ANTI-LOCK BRAKES, EXTERIOR LIGHTS SYSTEMS ANTI-THEFT SYSTEM BATTERY BCM FUSE 15 BLK/WHT WIRE BODY CONTROL MODULE (BCM) (LOWER LEFT SIDE OF DASH) COMPUTER DATA LINES SYSTEM CRUISE CONTROL, SEATS SYSTEMS CRUISE CTRL IND DIM SIG CTSY FUSE 5 DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE DRL RELAY CTRL EXHAUST BRK SW SIG FOG LAMP RELAY CTRL FRONT FOG LAMP SW SIG/ENABLE GAS DIESEL GROUND GRY WIRE HEADLAMP HI BEAM RELAY CTRL HEADLIGHTS SYSTEM HI SPD GMLAN SERIAL DATA BUS + HOOD AJAR SW SIG HOT AT ALL TIMES I/P FUSE BLOCK (LEFT SIDE OF DASH, I/P LAMP DIMMER SW SIG INDICATOR DIM CTRL INSTRUMENT CLUSTER SYSTEM INTERIOR LIGHTS, EXTERIOR LIGHTS SYSTEMS IPC FUSE 46 FUSE 43 IS LPS FUSE 17 LED BACKLIGHT DIM CTRL LINER INTERCONNECT BUS LO SPD SERIAL DATA LOW REF LT BLU WIRE LT GRN WIRE LT GRN/BLK WIRE LT GRN/WHT WIRE LT STOP TRN FUSE 6 LT TRLR TURN SIG LAMP ORG/ WIRE ORG/WHT WIRE PNK/BLK WIRE POWER DISTRIBUTION SYSTEM PPL/WHT WIRE RED WIRE RED/WHT WIRE RF TURN SIG LAMP SUPPLY RT STOP TRN FUSE 8 RT TRLR TURN SIG LAMP RUN/CRANK RELAY CTRL SECURITY IND CTRL SERIAL DATA COMM ENABLE STOP LAMPS FUSE 12 STP LP SW SIG TAN WIRE TAN/BLK WIRE TAN/WHT WIRE UNDERHOOD FUSE BLOCK WASHER RELAY CTRL WHT WIRE WIPER MOTOR PARK SW SIG WIPER/WASHER SYSTEM YEL WIRE

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

7 3 SUPPLY VOLT LOW REF BATTERY BLK WIRE COMPUTER DATA LINES SYSTEM DDM FUSE DK GRN WIRE DRIVER DOOR SWITCH (DDS) FUSE BLOCK (I/P) (LEFT SIDE OF DASH) GROUND HOT AT ALL TIMES HVAC CONTROL MODULE JUNCTION BLOCK (RIGHT I/P) (IN RIGHT END OF DASH) LOW REF OUTSIDE REARVIEW MIRROR- DRIVER OUTSIDE REARVIEW MIRROR- PASSENGER PASSENGER DOOR SWITCH (PDS) PDM FUSE POWER DISTRIBUTION SYSTEM R DEF REAR DEFOG SWITCH RED WIRE RED/WHT WIRE SERIAL DATA SUPPLY VOLT WHT WIRE

10 20 8 LF DR SW DR DOOR RF DR SW 15 14 LR DR SW RR DR SW 1639 5060 COMPUTER DATA LINES SYSTEM ABS IND. AIR BAG IND AUX HVAC-IGN FUSE 48 FUSE 45 B+ DIC SW SIG BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (BCM) (LOWER LEFT SIDE OF DASH) BRAKE FLUID LEVEL SWITCH (ON BRAKE MASTER CYLINDER RESERVOIR) BRAKE IND BRK SW CTRL BRN WIRE BRN/WHT WIRE CHARGE IND COOLANT TEMPERATURE GAUGE CRUISE IND DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE DRIVER INFORMATION CENTER (DIC) ELECTRONIC COMPASS MODULE ENGINE CONTROLS SYSTEM EXCEPT 6.6L 6.6L FOG LAMP IND FUEL GAUGE GRY/BLK WIRE HIGH BEAM IND HOT AT ALL TIMES I/P MULTI-FUNCTION SWITCH IGN IGN 1 GMLAN SERIAL IGN VOLT INSTRUMENT PANEL CLUSTER (IPC) INTERCONNECT NETWORK BUS IPC FUSE 46 FUSE 43 LEFT I/P JUNCTION BLOCK LEFT I/P JUNCTION BLOCK (LOWER LEFT SIDE OF DASH) LEFT TURN IND LINEAR LOGIC LOW OIL IND LOW REF LT BLU WIRE LT BLU/BLK WIRE LT GRN WIRE LT GRN/BLK WIRE MALFUNCTION IND (MIL) MIL CNTRL PASS SEAT BELT NETWORK BUS ODOMETER OIL GAUGE PARK BRAKE SWITCH (ON PARK BRAKE PEDAL ASSEMBLY) PASS SEAT BELT IND PNK WIRE POWER DISTRIBUTION SYSTEM PPL RED/WHT WIRE RIGHT TURN IND RUN/ CRNK RELAY RUN/CRK SEAT BELT IND SECURITY IND SPEEDOMETER SUPPLEMENTAL RESTRAINTS SYSTEM SW SIG TACHOMETER TAN WIRE TAN/WHT WIRE TIRE PRESSURE IND TOW/HAUL IND TRACTION CONTROL IND TRANSMISSION TEMPERATURE GAUGE UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) VOLTS GAUGE W/ COMFORT, DECOR LEVEL 3 CONVENIENCE PACKAGE WAIT TO START IND (6.6L) WIPER/WASHER SYSTEM YEL WIRE

3 8 DIM CNTRL PRK LP SIG 5 8 PPL 5060 6817 6816 COMPUTER DATA LINES SYSTEM 6086 974 29 8 IND CTRL LOW REF PPL ANTI-LOCK BRAKES SYSTEM AUTOMATIC A/C BLK WIRE BODY CONTROL MODULE (BCM) (LOWER LEFT SIDE OF DASH) BRN WIRE BRN/WHT WIRE COMPUTER DATA LINES SYSTEM DIM IS LPS FUSE FUSE DIM SIG DK GRN WIRE DK GRN/WHT WIRE DRIVER HEATED SEAT SWITCH (W/ SPO HEATED SEATS) DRIVER INFORMATION CENTER (DIC) SWITCH (W/ ACCESSORY STEERING WHEEL CONTROL) EXHAUST BRK SW SIG GRY/BLK WIRE HEAD HEADLAMP, PANEL DIMMER SWITCH HEATED SEATS HOT AT ALL TIMES I/P FUSE BLOCK (LEFT SIDE OF DASH) HVAC CONTROL MODULE (IF EQUIPPED) INFLATABLE RESTRAINT STEERING WHEEL MODULE COIL (BEHIND STEERING WHEEL) INSTRUMENT PANEL CLUSTER (IPC) LEFT STEERING WHEEL CONTROL SWITCH LOGIC LOW REF LT BLU WIRE OFF AUTO PARK ORG/WHT WIRE PASSENGER HEATED SEAT SWITCH (W/ SPO HEATED SEATS) POWER TAKE OFF (PTO) MODULE (OUTSIDE OF RIGHT FRONT CHASSIS FRAME) POWER TAKE OFF (PTO) SWITCH (IF EQUIPPED) PPL/WHT WIRE RADIO RED/WHT WIRE RIGHT STEERING WHEEL CONTROL SWITCH RR PRK ASSIST SECURITY WIRING PROVISIONS SERIAL DATA 10 18 25 BUS LED DIM DIM CTRL SWC BKLT FUSE 3 TAN WIRE TRAILER BRAKE CONTROL SWITCH (IF EQUIPPED) W/ ACCESSORY STEERING CONTROL, W/ ADOMETER W/ ACCESSORY STEERING WHEEL CONTROL W/ ELECTRIC DOOR LOCK CONTROL W/ LUXURY W/O ACCESSORY EDITION, STEERING ODOMETER WHEEL CONTROL SECURITY W/ SPO W/ SPO HEATED SEATS W/ TRAILER BRAKE CONTROL W/O SPO HEATED SEATS YEL WIRE

193 735 1050 DEFOGGER SYSTEM A/C CMPRSR FUSE 17 (EXCEPT 6.6L) FUSE 16 (6.6L) A/C CMPRSR RELAY A/C IND A/C ON AMBIENT AIR TEMPERATURE SENSOR BATT POS VOLT BLK WIRE BLK/WHT WIRE COLNT LVL COMPUTER DATA LINES SYSTEM DFRST VAL FRH AIR BLWR SPD FRESH AIR DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE ENGINE COOLANT LEVEL SWITCH (6.6L) (ON BOTTOM OF SURGE TANK) EVAPORATOR TEMPERATURE SENSOR (ON HVAC ASSEMBLY) FROM PWR/TRN RELAY (DIAGRAM 3 OF 3) GROUND GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES HVAC BATT FUSE 39 (EXCEPT 6.6L) FUSE 36 (6.6L) HVAC BLWR FUSE 70 (EXCEPT 6.6L) FUSE 65 (6.6L) HVAC IGN FUSE 55 (EXCEPT 6.6L) FUSE 52 (6.6L) INTERIOR LIGHTS SYSTEM POWER DISTRIBUTION SYSTEM 6817 300 1851 3340 5060 LED CNTL IGN 3 GROUND B(+) GMLAN L LEFT I/P JUNCTION BLOCK (LOWER LEFT SIDE OF DASH) LO REF RECIRC LOW REF LT GRN WIRE LT GRN/BLK WIRE MODE LOGIC SWITCH HVAC CONTROL MODULE MTR SPD CTRL ORG/ WIRE PNK WIRE PPL PPL/WHT WIRE R AIR TMP SENS SIG MODE CTRL BLOWER MOTOR CONTROL SWITCH REAR DEFOG TEMP SENS GROUND REAR DFG RECIR RECIR CTRL R AIR TMP LOW REF LOW REF RED WIRE RED/BLK WIRE RED/WHT WIRE RER DEF 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 RIGHT I/P JUNCTION BLOCK (IN RIGHT END OF DASH) RUN/ CRNK RELAY TAN WIRE TEMPERATURE CONTROL SWITCH UNDER- HOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE

BLK WIRE BRN WIRE BRN/WHT WIRE CMP SENSOR SIG DK BLU WIRE DK BLU/WHT WIRE ENGINE CONTROL MODULE (ECM) (LEFT FRONT OF ENGINE COMPT, NEAR FAN SHROUD) ENGINE COOLANT TEMPERATURE (ECT) SENSOR (TOP FRONT CENTER OF ENGINE) EXHAUST GAS RECIRCULATION (EGR) TEMPERATURE SENSOR 1 (TOP RIGHT REAR OF ENGINE) FUEL PRESSURE REGULATOR GRN WIRE GRY WIRE GRY YEL/BLK WIRE GRY/BLK WIRE GRY/WHT WIRE IAT SENSOR SIG DPF SENSOR SIG OIL PRESS SIG ECT SENSOR SIG INTAKE AIR TEMPERATURE (IAT) SENSOR 2 (ON TOP CENTER OF ENGINE) LOW REF LOW REF FUEL PRESS VOLT INJ + GROUP 4 INJ 6 INJ 3 LOW REF LOW REF LOW REF TURBO VANE POS FUEL INJ VOLT 3 INJ 5 INJ 4 LT BLU WIRE LT BLU/BLK WIRE LT GRN WIRE MAF SENSOR SIG LOW REF MAP SENSOR SIG TUR VANE POS SIG APP SENSOR 2 SIG NCA WIRE OIL LEVEL SW SIG ORG/ WIRE ORG/BLK WIRE PNK WIRE PNK/BLK WIRE PPL PPL/WHT WIRE RED WIRE STARTING/CHARGING SYSTEM TAN ORG/BLK WIRE TAN WIRE TAN/BLK WIRE TAN/WHT WIRE TRANSMISSIONS SYSTEM YEL WIRE YEL/BLK WIRE

1 2 PNK WIRE 22 23 24 25 PPL AXLE SW SIG BLK WIRE BRN WIRE BRN/WHT WIRE CAMSHAFT POSITION (CMP) SENSOR (FRONT OF ENGINE, ABOVE CRANK PULLEY) CKP SENSOR SIG CRANKSHAFT POSITION (CKP) SENSOR (FRONT OF ENGINE, RIGHT OF CRANK PULLEY) DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE EGT SENSOR SIG ENGINE CONTROL MODULE (ECM) (LEFT FRONT OF ENGINE COMPT, NEAR FAN SHROUD) FRP SENSOR SIG GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES HOT AT ALL TIMES UNDERHOOD FUSE HOLDER (RIGHT SIDE OF FIREWALL) IGN 1 VOLT INJ 1 INJ 2 INTAKE AIR VALVE LOW REF LT BLU WIRE LT BLU/BLK WIRE LT BLU/WHT WIRE LT GRN/BLK WIRE MEGA FUSE NCA WIRE ORG/ WIRE ORG/BLK WIRE PNK 8 9 10 WIRE PNK PNK WIRE PNK WIRE PNK/BLK WIRE POWER DISTRIBUTION SYSTEM PPL PPL/WHT WIRE PTO ENG OFF SIG RED WIRE RED/BLK WIRE RED/WHT WIRE SENS 2 SPLY VOL SIG TAN WIRE TAN/WHT WIRE TCC BRAKE SIG TP SENSOR SIG TRANSMISSIONS SYSTEM WATER IN FUEL WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE

23 1786 STARTING/CHARGING SYSTEM TRANSMISSIONS SYSTEM 2501 6399 COMPUTER DATA LINES SYSTEM TRANSMISSIONS SYSTEM 5985 2500 COMPUTER DATA LINES SYSTEM ACC WAKE SER DATA DATA BUS + AIR CONDITIONING SYSTEM ANTI-LOCK BRAKES SYSTEM BLK/WHT WIRE BLU WIRE BRN WIRE BRN/WHT WIRE DATA BUS - VSS SIG DK BLU WIRE DK COMPUTER DATA LINES SYSTEM DK GRN/WHT WIRE DRIVER INFORMATION CENTER (DIC) DISPLAY EGR MOTOR HIGH LOW REF A/C REFRIG SIG FUEL LEVEL SENSOR SIG ENGINE CONTROL MODULE (ECM) (LEFT FRONT OF ENGINE COMPT, NEAR FAN SHROUD) ENGINE OIL PRESSURE GAUGE ENGINE OIL PRESSURE IND EXHAUST GAS RECIRCULATION (EGR) TEMPERATURE SENSOR 2 (TOP RIGHT FRONT OF ENGINE) FUEL GAUGE FUEL PUMP LOW REF FUEL RAIL PRESSURE (FRP) SENSOR (TOP LEFT REAR OF ENGINE) FUEL RAIL TEMPERATURE (FRT) SENSOR (TOP LEFT REAR OF ENGINE) GENERATOR SIG PARK/NEUTRAL SIG GRN WIRE GRY WIRE IND INSTRUMENT PANEL CLUSTER (IPC) LOGIC LOW REF LOW REF MIL CONTROL A/C COMPRESS LT BLU WIRE LT BLU/WHT WIRE LT GRN/BLK WIRE MALFUNCTION INDICATOR LAMP NCA WIRE ORG/BLK WIRE PNK PNK PNK 1 2 3 WIRE PNK WIRE POWERTRAIN RLY CTRL MOTOR CTRL 1 IGN 1 VOLT PPL PRIMARY FUEL LEVEL SENSOR (IN FRONT FUEL TANK) RED WIRE STARTING/ CHARGING SYSTEM TACHOMETER TAN WIRE TAN/BLK WIRE VEHICLE SPEED SIG WAIT TO WAIT TO START WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE