Chevrolet·Express·2008 Chevrolet Express·Wiring
Wiring diagram

2008 Chevrolet Express — power distribution

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Power distribution

A 40A 50A 10A 40A 10A 10A 10A 10A 10A 15A 10A 20A 20A 10A 10A 15A 30A 30A G F 30 86 87 85 10A 50A GENERATOR AUXILIARY BATTERY BATTERY STARTER MOTOR GLOW PLUG CONTROL MODULE (GPCM) INTAKE AIR HEATER (IAH) AUXILIARY GENERATOR UNDERHOOD FUSE BLOCK ELECTRONIC BRAKE CONTROL MODULE (EBCM) BODY CONTROL MODULE (BCM) BLOWER MOTOR RESISTOR ASSEMBLY ENGINE CONTROL MODULE (ECM) DATA LINK CONNECTOR (DLC) TRAILER CONNECTOR INSTRUMENT PANEL CLUSTER (IPC) COOLANT HEATER TRANSMISSION CONTROL MODULE (TCM) BODY FUSE BLOCK ELECTRONIC COMPASS MODULE UPFITTER PROVISIONAL X2 17 16 3 2 X2 38 1 13 18 1 X1 X1 44 3 X2 47 X5 S 43 27 9 15 21 X1 77 A X3 3 2 X2 2 X4 3 1 2 20 4 11 C A A C 7 19 X3 47 X1 32 20 6 X3 X2 25 1 X2 A E A C 22 X1 X1 60 62 X2 X222 X321 B B 1 25 X2 RED/WHT RED/WHT RED/BLK RED RED RED RED RED RED RED RED RED RED RED RED RED RED/WHT RED/WHT RED/WHT RED/WHT RED/WHT RED/BLK RED/WHT RED/WHT RED/WHT RED/WHT RED/WHT RED/WHT BLK BLK BLK RED/WHT RED/WHT RED/WHT NCA RED/WHT RED/BLK RED/WHT BRN BRN BLK BRN BRN BRN BLK BRN BLK (W/ DUAL GENERATOR & AMBULANCE UPFITTER) W/ ACTIVE BRAKE CONTROL W/O ACTIVE BRAKE CONTROL (TRAILER BLUNT CUT) W/ TRUCK TRAILER W/ CIGAR LIGHTER W/O CIGAR LIGHTER (W/ AUXILIARY HEATER) (W/ ODOMETER SECURITY WIRING PROVISION (SEO)) (CUTAWAY, AMBULANCE & RV UPFITTERS) W/ RV UPFITTER W/ CUTAWAY UPFITTER W/ RV UPFITTER (UPFITTER BLUNT CUT) (IF EQUIPPED) G304 G302 UNDERHOOD JUNCTION BLOCK FUSIBLE LINK 3 FUSIBLE LINK 2 FUSIBLE LINK 5 FUSIBLE LINK 4 FUSIBLE LINK 1 ABS MDL FUSE 60 BCM 2 FUSE 37 BCM 1 FUSE 20 BCM 3 FUSE 26 BCM 6 FUSE 23 ABS MTR FUSE 61 FRT BLWR FUSE 66 BCM 5 FUSE 27 BCM 4 FUSE 22 BCM 7 FUSE 25 ECM BATT FUSE 54 LTR/DLC FUSE 38 AUX PWR OUTLET FUSE 33 SEO FUSE 21 FOH MDL FUSE 14 TRLR WRG FUSE 35 TCM BATT FUSE 44 TRLR WRG FUSE 62 CIGAR LIGHTER CENTER CONSOLE 1 ACCESSORY POWER OUTLET CENTER CONSOLE 2 ACCESSORY POWER OUTLET CMPS FUSE 2 UPFTR AUX 2 RELAY 42 UPFTR AUX 2 FUSE 35 J249 J247 (ON LEFT SIDE OF ENGINE COMPT) (UNDER LEFT FRONT SEAT) (BEHIND RIGHT KICK PANEL) (BEHIND LEFT KICK PANEL) TO HIGH BEAM PCB RELAY (DIAGRAM 2 OF 4) FROM RUN RELAY 39 (DIAGRAM 4 OF 4) FROM HVAC 2 FUSE 1 (DIAGRAM 4 OF 4)
A 30 85 B 25A 10A 87 86 15A 30A 10A 10A 15A 125A C 87 30 30 85 E 45A 10A A/C CMPRSR RELAY 74 HORN PCB RELAY WASHER PCB RELAY TRAILER RH STOP/TURN PCB RELAY STOP LAMPS PCB RELAY LO BEAM PCB RELAY DRL PCB RELAY TRAILER LH STOP/TURN PCB RELAY HIGH BEAM PCB RELAY CRNK RELAY 73 HI WPR RELAY 70 FUEL PUMP RELAY 72 WPR RELAY 7 FAN CLUTCH RELAY 75 UNDERHOOD FUSE BLOCK GLOW PLUG CONTROL MODULE (GPCM) MASS AIR FLOW (MAF)/ INTAKE AIR TEMPERATURE (IAT) SENSOR FUEL HEATER ENGINE CONTROL MODULE (ECM) REAR FUSE BLOCK LEFT FRONT ACCESS PANEL RELAY 5 LEFT REAR ACCESS PANEL RELAY 1 RIGHT ACCESS PANEL RELAY 6 FLUORESCENT WORK LAMP RELAY 2 26 X1 8 16 1 3 X1 76 X2 19 3 5 X2 7 13 X6 S 2 X2 52 B 15 11 10 6 5 1 A1 C1 PNK PNK PNK PNK PNK PNK PNK PNK PNK PNK PNK PNK PNK RED/BLK PNK RED RED RED/BLK ORG ORG ORG ORG ORG ORG ORG ORG ORG ORG (CUTAWAY) (MANUAL A/C) (W/ TRUCK TRAILER) (W/ TRUCK TRAILER) W/ CARGO LAMP WPR FUSE 39 PWR/TRN RELAY 76 MEGA FUSE 77 FAN CLUTCH FUSE 58 ECM PWR/TRN FUSE 65 GLOW PLUG MDL FUSE 53 MAF/CNSTR VENT FUSE 49 ECM PWR/TRN FUSE 50 FUEL HTR FUSE 4 DOME FLUORESCENT WORK LAMPS FUSE 2 PANEL ACTUATOR FUSE 3 J104 J302 J303 J312 (ON LEFT SIDE OF ENGINE COMPT) (IN PRP/UF2 HARNESS, 15 CM FROM REAR FUSE BLOCK) (ON LEFT "B" PILLAR) (IN PRP/UF2 HARNESS, 7 CM FROM BREAKOUT FOR REAR FUSE BLOCK) (IN PRP/UF2 HARNESS, 8 CM FROM REAR FUSE BLOCK) FROM TRLR WRG FUSE (DIAGRAM 1 OF 4) TO RUN/CRNK RELAY 69 (DIAGRAM 3 OF 4) TO BODY FUSE BLOCK (DIAGRAM 4 OF 4) FROM BODY FUSE BLOCK (DIAGRAM 4 OF 4)
START RUN ACC OFF START OFF ACC RUN D START RUN ACC START RUN OFF OFF ACC 30 B 86 85 87 10A 15A 10A 15A 10A 15A COOLANT HEATER ELECTRONIC BRAKE CONTROL MODULE (EBCM) BODY CONTROL MODULE (BCM) THEFT DETERENT MODULE (TDM) UNDERHOOD FUSE BLOCK INFLATABLE RESTRAINT I/P MODULE DISABLE SWITCH INFLATABLE RESTRAINT I/P MODULE INDICATOR INFLATABLE RESTRAINT SENSING & DIAGNOSTIC MODULE (SDM) INSTRUMENT PANEL CLUSTER (IPC) TRANSMISSION CONTROL MODULE (TCM) AUTOMATIC TRANSMISSION STOP LAMP SWITCH ENGINE CONTROL MODULE (ECM) GLOW PLUG CONTROL MODULE (GPCM) TRANSMISSION CONTROL MODULE (TCM) ENGINE CONTROL MODULE (EDM) J 19 4 X3 19 6 5 X1 4 2 2 3 14 21 1 2 X4 21 X4 X3 54 19 X3 56 50 4 B 32 40 X1 X3 58 X1 58 X3 45 21 X2 19 31 B X1 49 57 E X175 11 53 56 X2 X2 DK BLU DK BLU LT BLU LT BLU LT BLU LT BLU RED/ WHT RED/ WHT LT BLU WHT PNK PNK BRN BRN RED/ WHT BRN YEL LT BLU PNK PNK PNK PNK PNK PNK PNK PNK PNK PNK PNK PNK PNK BLK PNK BLK PNK DK BLU DK BLU PNK DK BLU W/O AUXILIARY HEATER W/ AUXILIARY HEATER W/O RV UPFITTER & MANUAL SUPPRESSION W/ MANUAL SUPPRESSION G102 IGNITION SWITCH KEY-IN SWITCH RUN/CRNK RELAY 69 TRANS FUSE 51 BRK SW FUSE 32 AIR BAG FUSE 34 IP CLSTR FUSE 30 ECM IGN FUSE 48 TCM IGN FUSE 47 J203 J119 J205 J102 J115 (IN STEERING COLUMN HARNESS, 27 CM FROM X200 CONNECTOR) (IN CHASSIS HARNESS, 15 CM FROM COOLANT HEATER BREAKOUT) (IN STEERING COLUMN HARNESS, 30 CM FROM X200 CONNECTOR) (ON LEFT SIDE OF ENGINE COMPT) (LEFT FRONT LOWER SIDE OF THE ENGINE BLOCK) (IN ENGINE HARNESS, 15 CM FROM X101 BREAKOUT) FROM BODY FUSE BLOCK (DIAGRAM 4 OF 4) FROM MEGA FUSE 77 (DIAGRAM 2 OF 4)
30 86 87 85 25A 50A 2A E 10A 30A 2A 10A 10A 15A C 85 10A 30 30A D F G 10A 30 87 86 85 20A 30 BODY FUSE BLOCK ALL DRS LOCK PCB RELAY CGO UNLCK PCB RELAY DRV UNLCK PCB RELAY PASS/CGO UNLCK PCB RELAY UPFTR CTSY LAMPS PCB RELAY BODY CONTROL MODULE (BCM) PASSENGER WINDOW SWITCH DRIVER WINDOW SWITCH UPFITTER PROVISIONAL PRK LAMP RELAY 40 INFLATABLE RESTRAINT FRONT PASSENGER SYSTEM (PPS) PRESENCE SENSOR INFLATABLE RESTRAINT VEHICLE ROLLOVER SENSOR INFLATABLE RESTRAINT SENSING & DIAGNOSTIC MODULE (SDM) OUTSIDE REARVIEW MIRROR SWITCH HVAC CONTROL ASSEMBLY PASSENGER SEAT ADJUSTER SWITCH INSTRUMENT PANEL CLUSTER (IPC) DRIVER SEAT ADJUSTER SWITCH REMOTE CONTROL DOOR LOCK RECEIVER (RCDLR) CHIME MODULE RADIO REAR DEFOG RELAY 44 BCK/UP LAMP PCB RELAY AIR TEMPERATURE ACTUATOR HVAC CONTROL ASSEMBLY VACUUM PUMP BODY CONTROL MODULE (BCM) AUXILIARY BLOWER MOTOR LOW SPEED RELAY AUXILIARY MODE ACTUATOR AUXILIARY BLOWER MOTOR HIGH SPEED RELAY AUXILIARY AIR TEMPERATURE ACTUATOR AUXILIARY BLOWER MOTOR MEDIUM SPEED RELAY REAR AUXILIARY HVAC CONTROL ASSEMBLY HVAC CONTROL ASSEMBLY AUXILIARY HVAC CONTROL MODULE FRONT AUXILIARY HVAC CONTROL ASSEMBLY 13 X1 10 X2 35 X1 22 28 12 X5 11 A C 61 X2 A X222 A X321 47 8 X1 X2 11 X1 5 14 26 31 15 X2 61 X3 S 10 X2 16 22 X2 60 E 1 F F A X3 20 1 1 26 51 30 X1 30 10 C1 C1 C1 C2 C2 C2 10 10 G J G 31 1 A 34 46 47 22 59 E X2 B 13 X5 B X3 X1 BLK YEL BLK DK GRN DK GRN RED/WHT RED/WHT RED/WHT RED/BLK RED/WHT RED/WHT RED/WHT RED/WHT RED/ WHT RED/BLK RED/BLK RED/BLK RED/WHT RED/WHT RED/WHT RED/BLK RED/BLK WHT WHT BRN BRN BRN RED/WHT BRN BRN BRN RED/WHT RED/WHT BRN BRN BRN BRN BRN BRN BRN BRN BRN RED/WHT BRN BRN BRN BRN BLK BRN BLK ORG RED/ RED/ (W/ CUTAWAY, AMBULANCE & RV UPFITTERS) (W/ AMBULANCE & RV UPFITTERS) W/ ELECTRIC SIDE DOOR LOCK CONTROL (NOT USED) (NOT USED) W/ COMMERCIAL TRADESMAN W/ RV UPFITTER W/ CUTAWAY (UPFITTER BLUNT CUT) (IF EQUIPPED) (IF EQUIPPED) W/ RADIO W/O RADIO (W/ ELECTRIC REAR WINDOW DEFOGGER & POWER WINDOWS) (W/O ODOMETER SECURITY WIRING PROVISION (SEO)) (W/ PASSENGER POWER SEAT ADJUSTER) (W/ DRIVER POWER SEAT ADJUSTER) (IF EQUIPPED) (W/ LEFT & RIGHT ROOF SIDE) (W/ LOW TIRE PRESSURE & REMOTE KEYLESS ENTRY) (LIGHT DUTY W/O RV UPFIITTER) (W/ POWER MIRROR & REAR WINDOW DEFOGGER) W/ REAR A/C W/ MANUAL A/C, POWER MIRRORS & REAR WINDOW DEFOGGER W/ REAR A/C & AUXILIARY HEATER W/ REAR A/C, AUXILIARY HEATER, PLUMBING & WIRING PROVISION W/ RV UPFITTER & 3406 W/O RV UPFITTER (W/ REAR WINDOW DEFOGGER, POWER MIRRORS & MANUAL A/C) G302 G302 RAP RELAY 43 UPFTR AUX 1 FUSE 36 PWR WDO CIRCUIT BREAKER 45 EMPTY FUSE 19 EMPTY FUSE 20 PWR SEATS CIRCUIT BREAKER 46 IGN SW PK3 MDL FUSE 3 HVAC CNTRL FUSE 12 AIR BAG AOS FUSE 32 RFA/TRM FUSE 11 OSRVM SW FUSE 18 RDO/CHIME FUSE 8 I/P CLSTR FUSE 7 RUN RELAY 39 REAR BLWR FUSE 37 HVAC 2 FUSE 1 HVAC 1 FUSE 5 J247 J247 J405 J307 J412 (UNDER LEFT FRONT SEAT) (BEHIND LEFT KICK PANEL) (IN REAR HVAC HARNESS, 13 CM FROM AUXILIARY BLOWER MOTOR CONNECTOR BREAKOUT) (EXCEPT REAR AUXILIARY & RV UPFITTER: IN FRONT HEADLINER HARNESS, 15 CM FROM X205 BREAKOUT TOWARDS LEFT VANITY MIRROR LAMP CONNECTOR) (W/ REAR AUXILIARY & RV UPFITTER: IN UPFITTER HVAC CONTROL HARNESS, 88 CM FROM X303 BREAKOUT) (EXCEPT RV UPFITTER: IN FRONT HEADLINER HARNESS, 52 CM FROM X304 BREAKOUT) (IN REAR HVAC HARNESS, 20 CM FROM AUXILIARY BLOWER MOTOR CONNECTOR BREAKOUT) (BEHIND LEFT KICK PANEL) TO REAR FUSE BLOCK (DIAGRAM 2 OF 4) FROM UNDERHOOD FUSE BLOCK (DIAGRAM 2 OF 4) TO J203 (DIAGRAM 3 OF 4) TO UPFITTER AUX 2 RELAY 42 (DIAGRAM 1 OF 4)