Communication With Alarm System Control Module

Communication With Alarm System Control Module

The two control modules "seat memory" and "alarm system" communicate via a signal lead. This enables adjustment of the mirror and seat positions via the hand-held transmitter. If required positions of the rearview mirror and driver's seat are assigned to a hand-held transmitter, the rearview mirror and driver's seat move to these positions as soon as the vehicle is unlocked with the hand-held transmitter.

The PST 2 can be used to test the communication line between the two control modules for an open circuit. Proceed as follows:
1. Connect PST 2 and switch on ignition.
2. Select "Seat memory" control module
3. Select "Alarm system interface level" in the menu item "Input signals"
4. Press the locked/unlocked button of the hand-held transmitter

The switch position on the PST 2 is closed briefly.


NOTE: The adjustment function via the hand-held transmitter is correct only if the radio code and the transponder code of a hand-held transmitter are each stored at the same position in the alarm system control module.