Chevrolet Chevy Express G3500 (1996-2012) blk Wiring diagrams

88 CM FROM RIGHT DOME FLUORESCENT WORK LAMP CONNECTOR BREAKOUT) ACCESS PANEL LEFT SIDE FRONT RELAY CONTROL ACCESS PANEL LEFT SIDE REAR RELAY CONTROL ACCESS PANEL RIGHT SIDE REAR RELAY CONTROL BETWEEN LEFT SIDE FRONT ACCESS PANEL ACTUATORS) BETWEEN LEFT SIDE REAR ACCESS PANEL ACTUATORS) BLK WIRE BODY CONTROL MODULE (BEHIND LOWER RIGHT SIDE OF DASH) HOT AT ALL TIMES LEFT FRONT ACCESS PANEL RELAY 5 LEFT FRONT SIDE FRONT ACCESS PANEL ACTUATOR (BEHIND LEFT FRONT ACCESS PANEL) LEFT FRONT SIDE REAR ACCESS PANEL ACTUATOR (BEHIND LEFT FRONT ACCESS PANEL) LEFT REAR ACCESS PANEL RELAY 1 LEFT REAR SIDE FRONT ACCESS PANEL ACTUATOR LEFT REAR SIDE REAR ACCESS PANEL ACTUATOR (BEHIND LEFT REAR ACCESS PANEL) LT BLU WIRE LT GRN WIRE ORG/ WIRE PANEL ACTUATOR FUSE 3 PNK WIRE REAR FUSE BLOCK (ON LEFT "B" PILLAR) RIGHT ACCESS PANEL RELAY 6 RIGHT SIDE FRONT ACCESS PANEL ACTUATOR (BEHIND RIGHT FRONT ACCESS PANEL) RIGHT SIDE REAR ACCESS PANEL ACTUATOR (BEHIND RIGHT REAR ACCESS PANEL) TAN WIRE TAN/BLK WIRE

AMB AIR TEMP SENS SIG LOW REF AMB LGHT SENSOR REAR LGHT SENSOR AMBIENT AIR TEMPERATURE SENSOR (BEHIND FRONT GRILLE, ON RADIATOR SUPPORT) BACKUP LAMP PWR BLK WIRE BODY CONTROL MODULE (BEHIND LOWER RIGHT SIDE OF DASH) ELECTRO- CHROMIC EXTERIOR LIGHTS SYSTEM (W/ PASSENGER/ CARGO) GRN WIRE GROUND HOT IN RUN AND START IGN 1 VLT INSIDE REARVIEW MIRROR ISRVM FUSE 26 LOGIC BACKUP LAMP PWR LT GRN WIRE PNK WIRE SELECTOR SW TAN WIRE UNDERHOOD FUSE BLOCK (ON LEFT SIDE OF ENGINE COMPT) WHT WIRE

BLK WIRE BODY FUSE BLOCK (BELOW LEFT FRONT SEAT) CLASS 2 CLASS 2 (PCM) DATA COMPUTER DATA LINES SYSTEM CRUISE IND DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE GRN WIRE GROUND GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES HOT IN RUN, START IGN IGN E FUSE 22 INSTRUMENT PANEL CLUSTER LT BLU WIRE NCA WIRE ON CRUISE CONTROL ON/OFF SWITCH OFF ON OFF ORG/BLK WIRE PCM IGN 1 FUSE 38 PNK WIRE POWERTRAIN CONTROL MODULE (PCM) (IN ENGINE COMPT, ON LEFT INNER FENDER) PPL PPL VSS LOW RED/WHT WIRE RESUME/ ACCEL RESUME/ACCEL SET/ COAST STOP LP FUSE 7 STOP/ CHMSL FUSE 8 STOPLAMP SWITCH (ABOVE BRAKE PEDAL) THROTTLE ACTUATOR CONTROL (TAC) MODULE (AT LEFT REAR OF ENGINE COMPARTMENT) TURN SIGNAL/ MULTIFUNCTION SWITCH UART SERIAL DATA UART SERIAL DATA UART SERIAL DATA UART SERIAL DATA SERIAL DATA 14 58 UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) VEHICLE SPEED SENSOR (VSS) (ON RIGHT SIDE OF TRANSMISSION) VSS HIGH WHT WIRE YEL WIRE

BLK WIRE BLU WIRE BODY FUSE BLOCK (BELOW LEFT FRONT SEAT) CARGO/ PASSENGER CLASS 2 CRUISE IND CLASS 2 (PCM) DATA COMPUTER DATA LINES SYSTEM CRUISE CONTROL MODULE (NEAR BRAKE FLUID RESERVOIR) CUTAWAY DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE GRN WIRE GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES HOT IN RUN, START IGN IGN E FUSE 22 INSTRUMENT PANEL CLUSTER LT BLU WIRE LT BLU/BLK WIRE NCA WIRE ON CRUISE CONTROL ON/OFF SWITCH OFF ON OFF PCM IGN 1 FUSE 38 PNK 17 (OR 1320) WIRE PNK WIRE POWERTRAIN CONTROL MODULE (PCM) (IN ENGINE COMPT, ON LEFT INNER FENDER) PPL PPL VSS LOW RED/WHT WIRE RESUME/ ACCEL RESUME/ACCEL SERIAL DATA SET/ COAST SPEED SIGNAL AUTO CRUISE INHIBIT SIG VSS HIGH 13 37 STOP LP FUSE 7 STOP/ CHMSL FUSE 8 STOPLAMP SWITCH (ABOVE BRAKE PEDAL) TURN SIGNAL/ MULTIFUNCTION SWITCH UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT) VEHICLE SPEED SENSOR (VSS) (ON RIGHT SIDE OF TRANSMISSION) WHT (OR LT BLU) WIRE WHT WIRE YEL WIRE

BLK WIRE BLOWER MOTOR (ON RIGHT REAR OF ENGINE COMPT, ON EVAPORATOR CASE) BLOWER MOTOR RELAY BODY FUSE BLOCK (UNDER LEFT FRONT SEAT) BRN WIRE BRN/WHT WIRE DEFOGGER SWITCH DEFOGGER CONTROL IND DEFOGGER SYSTEM DK BLU WIRE DK GRN/WHT WIRE FRONT AUXILIARY HVAC CONTROL ASSEMBLY FRT BLWR FUSE 74 GRY WIRE HOT AT ALL TIMES HOT W/ RUN/ HVAC 1 FUSE 14 HVAC 2 FUSE 13 HVAC CNTRL FUSE 25 HVAC CONTROL ASSEMBLY LOGIC LT BLU WIRE LT GRN WIRE MED OFF ORG/ WIRE REAR BLWR FUSE 29 RED WIRE RED/BLK WIRE RED/WHT WIRE TAN WIRE UNDERHOOD FUSE BLOCK (ON LEFT SIDE OF ENGINE COMPT) VACUUM PUMP (6.6L) (RIGHT FRONT OF ENGINE COMPT, UNDER BATTERY) W/ ELECTRIC REAR WINDOW DEFOGGER, POWER MIRRORS WHT WIRE YEL WIRE

A/C LOW PRESSURE SWITCH (ON SIDE OF ACCUMULATOR) AUXILIARY AIR TEMPERATURE ACTUATOR AUXILIARY BLOWER MOTOR (ON AUXILIARY HVAC) AUXILIARY BLOWER MOTOR MEDIUM SPEED RELAY AUXILIARY BLOWER MOTOR RESISTOR (ON AUXILIARY HEATER MOTOR) AUXILIARY HVAC MODULE) AUXILIARY MODE ACTUATOR BATT GND BLK WIRE BLK/WHT WIRE BREAKOUT) BRN WIRE COMPUTER DATA LINES SYSTEM COOLANT HEATER BLOWER MOTOR COOLANT HEATER COMBUSTION SENSOR COOLANT HEATER CONTROL MODULE COOLANT HEATER GLOW PLUG COOLANT HEATER OVERHEAT TEMPERATURE SENSOR COOLANT HEATER AIR TEMPERATURE SENSOR COOLANT HEATER TEMPERATURE SENSOR DK BLU WIRE DK BLU/LT GRN WIRE DK GRN WIRE DRIVER INFORMATION CENTER (DIC) DISPLAY ENGINE COOLANT LEVEL SWITCH ENGINE COOLANT TEMPERATURE GAUGE FOH MDL FUSE 35 FROM AUXILIARY BLOWER MOTOR BREAKOUT) FROM AUXILIARY BLOWER MOTOR CONNECTOR BREAKOUT) FUEL PUMP GND SERIAL - SERIAL + SERIAL - SERIAL + GRN/RED WIRE GRY WIRE HOT AT ALL TIMES INSTRUMENT PANEL CLUSTER (IPC) LOGIC LOGIC COOLANT LEVEL SW SIG LOW REF LOW SPD GMLAN SERIAL DATA LT BLU WIRE LT GRN WIRE ORG/ WIRE PROVISIONAL RED/WHT WIRE SERIAL DATA TAN WIRE TAN/BLK WIRE UNDERHOOD FUSE BLOCK (ON LEFT SIDE OF ENGINE COMPT) VOLT WHT WIRE YEL WIRE

12 13 34 28 27 25 8 65 43 44 59 36 63 66 46 PRESS SENS LOW REF 19 21 69 14 71 CTRL SPD SIG CTRL SPD SIG SPEED SIG 21 22 58 4 24 40 SENS SIG LOW REF 6.6L 4.3L 4.8L, 5.3L, 6.0L A/C CMPRSR FUSE 18 A/C CMPRSR RELAY 40 A/C COMPRESSOR CLUTCH A/C REFRIGERANT PRESSURE SENSOR A/C SERIAL REQUEST DATA SIG BLK WIRE BODY CONTROL MODULE (BCM) (BEHIND LOWER RIGHT SIDE OF DASH) BRN/WHT WIRE CLUTCH RLY CTRL COMPUTER DATA LINES SYSTEM COOLING FAN ASSEMBLY (6.6L) (BEHIND RADIATOR) DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE ENGINE CONTROL MODULE (ECM) ENGINE COOLANT TEMPERATURE (ECT) SENSOR FAN CLTCH (EV) FUSE 63 GMLAN - GMLAN + GMLAN DATA GRY WIRE HOT AT ALL TIMES HOT W/ PWR/TRN RELAY 49 ENERGIZED LOW REF LT BLU WIRE LT GRN WIRE OF ENGINE) ORG/BLK WIRE PNK WIRE REF SIDE OF ENGINE COMPT) TAN WIRE TAN/BLK WIRE UNDERHOOD FUSE BLOCK (ON LEFT W/ AUXILIARY FUEL FIRED HEATER W/O AUXILIARY FUEL FIRED HEATER WHT (OR RED) WIRE WHT/BLK WIRE YEL WIRE

BLK WIRE BLOWER MOTOR (ON RIGHT REAR OF ENGINE COMPT, ON EVAPORATOR CASE) BLOWER MOTOR RELAY BODY FUSE BLOCK (UNDER LEFT FRONT SEAT) BREAKOUT) BRN WIRE BRN/WHT WIRE DEFOGGER SWITCH DEFOGGER IND DEFOGGER SYSTEM DK BLU WIRE DK GRN/WHT WIRE FLOOR MIX BLEND DEF MAX A/C OFF A/C BI-LEV FRONT AUXILIARY HVAC CONTROL ASSEMBLY FRT BLWR FUSE 74 GND IGN GRY WIRE HOT AT ALL TIMES HOT W/ RUN/ HVAC 1 FUSE 14 HVAC 2 FUSE 13 HVAC CNTRL FUSE 25 HVAC CONTROL ASSEMBLY INTERIOR LEFT REAR OF ENGINE) (4.3L: RIGHT REAR OF ENGINE) LIGHTS SYSTEM LOGIC 2 1 LT BLU WIRE LT GRN WIRE MAX A/C OFF A/C BI-LEV VENT MED OFF ORG/ WIRE PNK/BLK WIRE PPL PPL/WHT WIRE REAR REAR AUXILIARY HVAC CONTROL ASSEMBLY REAR BLWR FUSE 29 REAR DUAL SIG CTRL REAR DUAL CTRL RED WIRE RED/BLK WIRE RED/WHT WIRE SPLICE BLOCK TAN WIRE UNDERHOOD FUSE BLOCK (ON LEFT SIDE OF ENGINE COMPT) VACUUM PUMP (6.6L) (RIGHT FRONT OF ENGINE COMPT, UNDER BATTERY) VENT FLOOR DEF MIX BLEND W/ ELECTRIC REAR WINDOW DEFOGGER, POWER MIRRORS W/ RV UPFITTER W/O RV (ATTACHED TO LOWER RIGHT "B" PILLAR PART OF UPFITTER W/O RV UPFITTER W/O RV W/ RV UPFITTER UPFITTER WHT WIRE YEL WIRE

2501 2500 2501 2500 COMPUTER DATA LINES SYSTEM A/C LOW PRESSURE SWITCH (ON SIDE OF ACCUMULATOR) AUXILIARY AIR TEMPERATURE ACTUATOR AUXILIARY BLOWER MOTOR (ON AUXILIARY HVAC) AUXILIARY BLOWER MOTOR MEDIUM SPEED RELAY AUXILIARY BLOWER MOTOR RESISTOR ASSEMBLY (ON AUXILIARY AUXILIARY HVAC MODULE) AUXILIARY MODE ACTUATOR BATT GND BLK WIRE BLK/WHT WIRE BLOWER MOTOR BREAKOUT) BREAKOUT) BRN WIRE COMPUTER DATA LINES SYSTEM COOLANT HEATER BLOWER MOTOR COOLANT HEATER COMBUSTION SENSOR COOLANT HEATER CONTROL MODULE COOLANT HEATER GLOW PLUG COOLANT HEATER OVERHEAT TEMPERATURE SENSOR COOLANT HEATER AIR TEMPERATURE SENSOR COOLANT HEATER TEMPERATURE SENSOR DK BLU WIRE DK BLU/LT GRN WIRE DK GRN WIRE DRIVER INFORMATION CENTER (DIC) DISPLAY ENGINE COOLANT LEVEL SWITCH ENGINE COOLANT TEMPERATURE GAUGE FOH MDL FUSE 35 FROM AUXILIARY BLOWER MOTOR CONNECTOR BREAKOUT) FUEL PUMP GND SERIAL - SERIAL + SERIAL - SERIAL + GRN/RED WIRE GRY WIRE HEATER MOTOR HOT AT ALL TIMES INSTRUMENT PANEL CLUSTER (IPC) LOGIC LOGIC COOLANT LEVEL SW SIG LOW REF LOW SPD GMLAN SERIAL DATA LT BLU WIRE LT GRN WIRE ORG/ WIRE PROVISIONAL RED/WHT WIRE SERIAL DATA TAN WIRE TAN/BLK WIRE UNDERHOOD FUSE BLOCK (ON LEFT SIDE OF ENGINE COMPT) VOLT WHT WIRE YEL WIRE

19 21 69 14 71 CTRL SPD SIG CTRL SPD SIG SPEED SIG 24 40 58 4 21 22 SENS SIG LOW REF 59 36 63 66 46 25 8 65 43 44 12 13 34 28 27 PRESS SENS LOW REF 6.6L 4.3L 4.8L, 5.3L, 6.0L A/C CMPRSR FUSE 18 A/C CMPRSR RELAY 40 A/C COMPRESSOR CLUTCH A/C REFRIGERANT PRESSURE SENSOR A/C SERIAL REQUEST DATA SIG BLK WIRE BODY CONTROL MODULE (BCM) (BEHIND LOWER RIGHT SIDE OF DASH) BRN/WHT WIRE CLUTCH RLY CTRL COMPUTER DATA LINES SYSTEM COOLING FAN ASSEMBLY (6.6L) (BEHIND RADIATOR) DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE ENGINE CONTROL MODULE (ECM) ENGINE COOLANT TEMPERATURE (ECT) SENSOR FAN CLTCH (EV) FUSE 63 GMLAN - GMLAN + GMLAN DATA GRY WIRE HOT AT ALL TIMES HOT W/ PWR/TRN RELAY 49 ENERGIZED LOW REF LT BLU WIRE LT GRN WIRE OF ENGINE) ORG/BLK WIRE PNK WIRE REF SIDE OF ENGINE COMPT) TAN WIRE TAN/BLK WIRE UNDERHOOD FUSE BLOCK (ON LEFT W/ AUXILIARY FUEL FIRED HEATER W/O AUXILIARY FUEL FIRED HEATER W/O AUXILIARY FUEL FIRED HEATER W/ AUXILIARY FUEL FIRED HEATER WHT/BLK WIRE YEL WIRE