Body Control Module: Description and Operation
Body Control ModuleThe BCM controls various vehicle electrical systems or features from one central module, instead of using individual modules for each system or feature. The BCM is located beneath the instrument panel cluster to the right of the steering column and is mounted in a flat, horizontal position. The BCM fitted to various levels of vehicles is physically the same, but with different functions in the BCM software.
Important: Disconnect and remove all vehicle modules, after disconnecting the battery, before performing any welding anywhere on the vehicle. Failing to do this can cause permanent damage to the modules.
If the BCM is to be replaced, ensure that the correct BCM is used. The last three digits of the BCM part number identify the BCM.
BCM Features
* Central door locking with auto lock in drive
* Rear compartment release with speed interlock
* Power window system with driver and passenger express down
* Approach illumination at night
* Dome lamp delay control entry delay, central locking and ignition off courtesy illumination
* Intermittent wiper control with road speed dependent variable dwell
* Instrument dimming control
* Automatic lights off with adjustable delay
* Automatic lights on with twilight sentinel
* Theft deterrent system vehicle immobilization and entry alarm
* Engine cooling low speed fan control
* Battery saver
- Reduce standing current
- Courtesy and compartment illumination
- Timed cut-out
- Pre-delivery 3 minute cut-out
* Remote control via coded key
- Remote central locking with two-stage unlock
- Remote rear compartment release
* Airbag deployment vehicle shutdown
* Heated rear window
* Air conditioning interface system (NC switch)
* Accessory power control (delay accessories bus)
* Serial data interface