In automotive systems, Body Control (managed by the Body Control Module, or BCM) refers to the electronic control of non-powertrain functions. Body control includes essentially, all the systems that enhance comfort, convenience, and safety in a vehicle’s body. It coordinates and manages various electrical subsystems in a vehicle’s body like lighting, windows, wipers, locks, mirrors, and HVAC. These interactions typically occur over CAN, LIN, or FlexRay communication buses, enabling coordination between ECUs (e.g., Engine Control Unit, Instrument Cluster, Airbag ECU).
Typical Functions Managed by Body Control:
| Function Category | Examples |
|---|---|
| Lighting Control | Headlights, taillights, interior lights, dimming, automatic light control |
| Security & Access | Central locking, keyless entry, alarm system, immobilizer |
| Comfort Systems | Power windows, mirrors, seat adjustment, sunroof, cabin lighting |
| Wiper & Washer Control | Front/rear wipers, rain-sensing control, washer pumps |
| HVAC Interface | Fan control, temperature control (shared with climate ECU) |
| Communication | CAN/LIN bus gateway between sensors, switches, and other ECUs |
| Battery & Load Management | Power saving modes, sleep/wake cycles, current distribution |
Here is block diagram of a Body Control System architecture (showing sensors, actuators, and communication buses)
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