Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2012EXPRESS 2500 V8-4.8LREPAIR AND DIAGNOSISPOWER AND GROUND DISTRIBUTIONDIAGRAMSELECTRICAL DIAGRAMSPOWER DISTRIBUTION SCHEMATICS
2012 Chevrolet Express 2500 V8-4.8L
Power Distribution Schematics
2012 Chevrolet Express 2500 V8-4.8LSECTION Power Distribution Schematics
Power Distribution Schematics
B+ Bus- Underhood Fuse Block (1 of 2)
Master Electrical Component List
Control Module References
B+ Bus - Underhood Fuse Block (2 of 2)
Electrical Center Identification Views
B+ Bus - Body Fuse Block
UPFTR CTSY LAMP(S) Fuse and LPCM Fuse (KO7)
B+ Bus- Underhood Fuse Block (2 of 2)
Master Electrical Component List
Control Module References
B+ Bus - Body Fuse Block
B+ Bus - Underhood Fuse Block (1 of 2)
Electrical Center Identification Views
B+ Bus- Body Fuse Block
Master Electrical Component List
Control Module References
AUX PWR OUTLET, BCM-1, BCM-2, BCM-3, BCM-4, BCM-5, BCM-6, BCM-7, FOH MDL, FRT BLWR, LTR/DLC, and TRLR WRG Fuses
B+ Bus - Underhood Fuse Block (2 of 2)
B+ Bus - Underhood Fuse Block (1 of 2)
Electrical Center Identification Views
AUX PWR OUTLET, BCM-1, BCM-2, BCM-3, BCM-4, BCM-5, BCM-6, BCM-7, FOH MDL, FRT BLWR, LTR/DLC, and TRLR WRG Fuses
Master Electrical Component List
Control Module References
A/C CMPRSR, ABS MDL, ABS MTR, DIESEL FUEL PUMP, GAS FUEL PUMP, HORN, and WASH Fuses
B+ Bus - Body Fuse Block
A/C CMPRSR, ABS MDL, ABS MTR, DIESEL FUEL PUMP, GAS FUEL PUMP, HORN, and WASH Fuses
Master Electrical Component List
Control Module References
AUX STOP LAMP(S), LT HI BEAM, LT STOP/TRN TRLR, RT HI BEAM, RT STOP/TRN TRLR, and STRTR SOL Fuses
AUX PWR OUTLET, BCM-1, BCM-2, BCM-3, BCM-4, BCM-5, BCM-6, BCM-7, FOH MDL, FRT BLWR, LTR/DLC, and TRLR WRG Fuses
Electrical Center Identification Views
AUX STOP LAMP(S), LT HI BEAM, LT STOP/TRN TRLR, RT HI BEAM, RT STOP/TRN TRLR, and STRTR SOL Fuses
Master Electrical Component List
Control Module References
DRL 1, (UPLVL+V22), DRL 2 (LOLVL-V22), LT LO BEAM, RT LO BEAM, SEO, and TCM BATT Fuses
A/C CMPRSR, ABS MDL, ABS MTR, DIESEL FUEL PUMP, GAS FUEL PUMP, HORN, and WASH Fuses
Electrical Center Identification Views
DRL 1 (UPLVL+V22), DRL2 (LOLVL-V22), LT LO BEAM, RT LO BEAM, SEO, and TCM BATT Fuses
Master Electrical Component List
Control Module References
CNSTR VENT SOL, ECM BATT, FCSM BATT, and WPR Fuses
AUX STOP LAMP(S), LT HI BEAM, LT STOP/TRN TRLR, RT HI BEAM, RT STOP/TRN TRLR, and STRTR SOL Fuses
Electrical Center Identification Views
CNSTR VENT SOL, ECM BATT, FCSM BATT, and WPR Fuses
Master Electrical Component List
Control Module References
AIRBAG, BRK SW, ECM IGN/GLOW PLUG MDL IGN, FCSM IGN, IPC, STR/WHL/SNSR, TCM IGN, and TRANS Fuses
DRL 1, (UPLVL+V22), DRL 2 (LOLVL-V22), LT LO BEAM, RT LO BEAM, SEO, and TCM BATT Fuses
Electrical Center Identification Views
AIRBAG, BRK SW, ECM IGN/GLOW PLUG MDL IGN, FCSM IGN, IPC, STR/WHL/SNSR, TCM IGN, and TRANS Fuses
Master Electrical Component List
Control Module References
ECM PWR/TRN, MAF/CNSTR VENT, O2 SNSR 1 (PRE)/CLS, and O2 SNSR 2 (POST) Fuses
CNSTR VENT SOL, ECM BATT, FCSM BATT, and WPR Fuses
Electrical Center Identification Views
Master Electrical Schematic Icons
ECM PWR/TRN, MAF/CNSTR VENT, O2 SNSR 1 (PRE)/CLS, and O2 SNSR 2 (POST) Fuses
Master Electrical Component List
Control Module References
ECM PWR/TRN, EVEN IGN/IJN, FUEL HTR, and V6 FUEL INJ Fuses
AIRBAG, BRK SW, ECM IGN/GLOW PLUG MDL IGN, FCSM IGN, IPC, STR/WHL/SNSR, TCM IGN, and TRANS Fuses
Electrical Center Identification Views
ECM PWR/TRN, EVEN IGN/IJN, FUEL HTR, and V6 FUEL INJ Fuses
Master Electrical Component List
Control Module References
FAN CLTCH (EV) and ODD IGN/INJ Fuses
ECM PWR/TRN, MAF/CNSTR VENT, O2 SNSR 1 (PRE)/CLS, and O2 SNSR 2 (POST) Fuses
FAN CLTCH (EV) and ODD IGN/INJ Fuses
Master Electrical Component List
Control Module References
HVAC CNTRL, I/P CLUSTER, ONSTAR, OSRVM SW, RDO/CHIME, REAR BLWR, and RFA/TPM Fuses and PWR SEATS Circuit Breaker
ECM PWR/TRN, EVEN IGN/IJN, FUEL HTR, and V6 FUEL INJ Fuses
Electrical Center Identification Views
HVAC CNTRL, I/P CLUSTER, ONSTAR, OSRVM SW, RDO/CHIME, REAR BLWR, and RFA/TPM Fuses and PWR SEATS Circuit Breaker
Master Electrical Component List
Control Module References
Ignition Switch and IGN SW (DLIS)/PK3 Fuse
FAN CLTCH (EV) and ODD IGN/INJ Fuses
Ignition Switch and IGN SW (DLIS)/PK3 Fuse
Master Electrical Component List
Control Module References
AIRBAG/AOS, OSRVM HTR, and REAR DEFOG Fuses and PWR WINDOW(S) Circuit Breaker
HVAC CNTRL, I/P CLUSTER, ONSTAR, OSRVM SW, RDO/CHIME, REAR BLWR, and RFA/TPM Fuses and PWR SEATS Circuit Breaker
Electrical Center Identification Views
AIRBAG/AOS, OSRVM HTR, and REAR DEFOG Fuses and PWR WINDOW(S) Circuit Breaker
Master Electrical Component List
Control Module References
CARGO DR UNLCK, DVR DR UNLCK, FRT PASS DR UNLCK and REAR PASS DR UNLCK Fuses
Ignition Switch and IGN SW (DLIS)/PK3 Fuse
Electrical Center Identification Views
Master Electrical Schematic Icons
CARGO DR UNLCK, DVR DR UNLCK, FRT PASS DR UNLCK and REAR PASS DR UNLCK Fuses
Master Electrical Component List
Control Module References
FRT DR LCK, REAR DR LCK and UPFITTER AUX1 Fuses
AIRBAG/AOS, OSRVM HTR, and REAR DEFOG Fuses and PWR WINDOW(S) Circuit Breaker
Electrical Center Identification Views
FRT DR LCK, REAR DR LCK and UPFITTER AUX1 Fuses
Master Electrical Component List
Control Module References
HVAC1 and HVAC2 Fuses
CARGO DR UNLCK, DVR DR UNLCK, FRT PASS DR UNLCK and REAR PASS DR UNLCK Fuses
Electrical Center Identification Views
HVAC1 and HVAC2 Fuses
Master Electrical Component List
Control Module References
AUX/TRLR BCK/UP, CMPS, READING LAMP(S), TAIL LAMP(S), AND UPFITTER AUX2 Fuses
FRT DR LCK, REAR DR LCK and UPFITTER AUX1 Fuses
Electrical Center Identification Views
AUX/TRLR BCK/UP, CMPS, READING LAMP(S), TAIL LAMP(S), and UPFITTER AUX2 Fuses
Master Electrical Component List
Control Module References
AUX PRK LAMP(S), FRT PRK LAMP(S), LT REAR PARK LAMP, RT REAR PRK LAMP, TRLR PRK LAMP(S), and UPFTR PRK LAMP(S) Fuses
HVAC1 and HVAC2 Fuses
Electrical Center Identification Views
AUX PRK LAMP(S), FRT PRK LAMP(S), LT REAR PARK LAMP, RT REAR PRK LAMP, TRLR PRK LAMP(S), and UPFTR PRK LAMP(S) Fuses
Master Electrical Component List
Control Module References
UPFTR CTSY LAMP(S) Fuse and LPCM Fuse (KO7)
AUX/TRLR BCK/UP, CMPS, READING LAMP(S), TAIL LAMP(S), AND UPFITTER AUX2 Fuses
Electrical Center Identification Views
Master Electrical Schematic Icons
UPFTR CTSY LAMP(S) Fuse and LPCM Fuse (KO7)
Master Electrical Component List
Control Module References
AUX PRK LAMP(S), FRT PRK LAMP(S), LT REAR PARK LAMP, RT REAR PRK LAMP, TRLR PRK LAMP(S), and UPFTR PRK LAMP(S) Fuses
Electrical Center Identification Views
B+ Bus - Underhood Fuse Block (1 of 2)
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.