Brake Control Module (BCM)

Fig 1: Identifying Brake Control Module (BCM)

Courtesy of VOLVO CARS CORPORATION

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 or the corresponding signal from the transmission control module (TCM) to determine whether the vehicle is moving. The central electronic module (CEM) uses these signals together with the signals from the brake control module (BCM) and transmission control module (TCM) to determine whether the steering wheel 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.