Central Locking System: Introduction

The Car Access System (CAS) monitors all the processes in the central locking system. The CAS control unit is the master control unit for the central locking.

Up to 09/2005, the central locking system on the front doors is actuated by the door modules (driver's door module and front passenger door module).

• From 09/2005 

The door modules are discontinued. The central locking system on the front doors is actuated by the body gateway module (KGM).

The following central locking drives are actuated by the body basic module (KBM).

• Rear doors (E60, E61 only)
• Rear lid
• Fuel filler flap
• Rear window (E61 only)

The CAS control unit uses the requests from various operating points (e.g. lock cylinder, remote control) to decide what needs to be done:

• Locking/deadlocking the central locking system
• Unlocking the central locking system