Car Access System (CAS)

As Central Locking Master (ZV master), the CAS controls all the higher-level functions of the Central Locking system.

It centrally monitors the battery voltage of the ZV (lock actuators) assemblies.

The ZV assemblies function within a voltage range of 9 V to 16 V.

Fig 1: Identifying Car Access System (CAS)

Courtesy of BMW OF NORTH AMERICA, INC.

Activation of the ZV assemblies is controlled as follows:

• For safety reasons, the "crash unlocking" function is activated independently of the battery voltage.
• If the CAS determines a value less than 9 V or greater than 16 V, there is no forwarding or implementation of operator prompts by the CAS.
• The motors in the doors are blanked out based on the evaluation of the local voltage at the door modules (motors for Soft Close Automatic and motors for electric opening).

The CAS contains the master functions of the power window system. It is also responsible for signalling the convenience open/closed requests.