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.
Body Control System Description and Operation: Notes
The body control system consists of a BCM and it's associated controls. Battery positive voltage is provided to the BCM from BFC/BATT fuse in the left hand Instrument panel fuse block. The module ground is wired to ground G202. The BCM utilizes inputs Ignition 0, Ignition 1 and Ignition 3 to differentiate the power mode that the ignition switch has bean placed in. The BCM is wired to the Class 2 serial data communication bus as well as discreet input and output terminals to control the functions of the vehicles body. The various BCM input and output circuits are described in the corresponding functional areas indicated on the BCM electrical schematics. The Body Control Module functions include the following.
- Serial Data Communications
- Class 2 Serial Data Communications
- Serial Peripheral Interface (SPI)
- A/C compressor request
- Remote Function Control
- A/C cooling Fan
- Exterior and interior lighting control
- Daytime running lights (DRL)
- Automatic lighting control
- Fog lamps
- Interior lighting
- Battery rundown protection (Inadvertent Power)
- Chimes
- Key In Ignition
- Head Lamps On
- Seat Belt Not Fastened
- Turn Signal On
- Park Brake Warning
- Door Ajar Warning
- Check gages
- Gage control
- Instrument cluster indicator control
- Theft deterrent
- Engine coolant level sensing
- Washer solvent level sensing
- Key-in-ignition sensing
- Seat belt use sensing
- Brake fluid level sensing
- Parking brake state sensing
- Rear compartment interface
- Horn interface
- Door lock interface
- Bulb Check
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.