3.2. Function overview

The Car Access System provides, among other things, the central control unit for accessing and locking the vehicle Therefore, the Car Access System has full responsibility for central locking.

The Car Access System incorporates the following functions on the F10:

• Comfort Access
• Central locking system
• Power window regulator
• Glass sunroof
• Terminal control
• Electronic immobilizer

Other functions of the Car Access System include:

• Vehicle data storage
• Data transmission for Conditioned Based Service (CBS)
• Checking plausibility of ID transmitter signals

The Car Access System enables or disables the execution of a number of functions. However, other control units may be involved in the execution of the function:

• Junction box electronics
• Footwell module
• Roof function center
• Central locking system
• Power window regulator
• Glass sunroof

For the purposes of communication with other bus users in the vehicle electrical system, the Car Access System is connected via the K-CAN2, the CAS bus and the LIN-Bus.

The Car Access System analyzes the status of the trunk lid contact switch and broadcasts it for use by the alarm system.

The Car Access System also analyzes the status of the following buttons and initiates the central locking function:

• Central locking system button
• Open large trunk button on the A-pillar
• Complete locking of the vehicle with the button in the underside of the open luggage compartment lid.

The Car Access System provides the power supply for the brake light switch and also analyzes its status.