Transmission Control Module (TCM)

Fig 1: Identifying Control Module/Gear-Shift Position Sensor

Courtesy of VOLVO CARS CORPORATION

The transmission control module (TCM) (4/28) 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 brake control module (BCM) 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.