Brake Control Module (BCM)
The brake control module (BCM) (4/16) transmits signals on the controller area network (CAN) about the vehicle speed. The central electronic module (CEM) uses this signal to determine whether the vehicle is moving. The central electronic module (CEM) uses these signals from the brake control module (BCM) to determine whether the steering column lock can be locked or not.
When deactivating the immobilizer system, the communication between the engine control module (ECM) and brake control module (BCM) is checked. During this check, the engine control module (ECM) reads off the serial number from the brake control module (BCM) and compares this with a number it has programmed. The engine will not start if the numbers do not correspond.
For further information, see Design and Function information for the BRAKE CONTROL MODULE (BCM) .