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.
BDC Body Domain Controller: Notes
The Body Domain Controller controls the interior lighting and the exterior lights. In the event of an accident with the corresponding severity, the interior lighting and hazard warning lights switch on automatically.
The Body Domain Controller provides input signals for terminal voltages (such as Terminal 15 wake-up wire ON). The Body The main Controller supplies voltage to the Crash Safety Module (ACSM) (starting at Terminal 30B ON).
The Body Domain Controller represents a new generation superseding existing control units and their functions. For example, the Body Domain Controller safeguards functions from the following former control units:
- FRM: Footwell module
- CAS: Car Access System
- JBE: Junction Box Electronics
- ZGM: Central gateway module
The central gateway module is integrated into the Body Domain Controller (BDC). The central gateway module is seen as a control unit within the control unit, as the central gateway module (ZGM) acts as a self-sufficient control unit within the Body Domain Controller.
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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.