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 MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1236 (DATA COMMUNICATION SYSTEM)DESCRIPTION AND OPERATIONBODY CONTROL SYSTEM DESCRIPTION AND OPERATIONBODY CONTROL MODULE
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Body Control Module
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Body Control Module
WARNING: This page is about a different car, the 2008 Chevrolet Malibu Classic. However, it is still accessible from the selected car via links, so may be relevant.
The various body control module (BCM) input and output circuits are described in the corresponding functional areas indicated on the BCM electrical schematics. The BCM functions include the following:
- A/C compressor request. Refer to Air Temperature Description and Operation .
- A/C cooling fan. Refer to Air Delivery Description and Operation .
- Battery rundown protection (inadvertent power). Refer to Interior Lighting Systems Description and Operation .
- Bulb check. Refer to Instrument Cluster Description and Operation .
- Chimes. Refer to Indicator/Warning Message Description and Operation
.
- Check gages
- Door ajar warning
- Headlamps ON
- Key-in-ignition
- Oil reset
- Park brake warning
- Seat belt not fastened
- Turn signal ON
- Door lock interface. Refer to Power Door Locks Description and Operation .
- Electronic power steering (EPS). Refer to Power Steering System Description and Operation (Hydraulic Power Steering) or Power Steering System Description and Operation (Electronic Power Steering) .
- Engine coolant level sensing. Refer to Cooling System Description and Operation .
- Exterior and interior lighting control. Refer to Exterior Lighting Systems Description and Operation
.
- Automatic lighting control
- Daytime running lamps (DRL)
- Fog lamps
- Park brake lights
- Turn hazard lamps
- Gage control. Refer to Instrument Cluster Description and Operation .
- Horn interface. Refer to Horns System Description and Operation .
- Instrument cluster indicator control. Refer to Instrument Cluster Description and Operation .
- Interior lighting. Refer to Interior Lighting Systems Description and Operation .
- Key-in-ignition sensing. Refer to Indicator/Warning Message Description and Operation .
- Parking brake state sensing. Refer to Brake Warning System Description and Operation .
- Retained accessory power (RAP). Refer to Retained Accessory Power (RAP) Description and Operation .
- Rear compartment interface. Refer to Power Door Locks Description and Operation .
- Rear defogger. Refer to Rear Window Defogger Description and Operation .
- Remote function control. Refer to Keyless Entry System Description and Operation .
- Seat belt use sensing. Refer to Seat Belt System Description and Operation .
- Content theft deterrent. Refer to Content Theft Deterrent (CTD) Description and Operation .
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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.