Car access system (CAS)

The Car Access System (CAS) is the control unit that regulates access to the vehicle (key identification). It checks the prerequisites for release before the junction box electronics (JBE) and the footwell module (FRM) are activated. The Car Access System (CAS) is directly connected to the K-CAN2. The Car Access System (CAS) prepares signals and makes these available to other bus users in the vehicle electrical system.

The Car Access System (CAS) furnishes the brake-light switch with a 5-volt voltage supply. The Car Access System (CAS) processes the status of the brake-light switch and transmits it through K CAN2. The footwell module (FRM) receives the status of the brake-light switch and uses it in controlling activation of the brake light.

Fig 1: Identifying Car Access System (CAS)

Courtesy of BMW OF NORTH AMERICA, INC.