Switches In The Lock Units
A contact breaker is mounted in the lock units on the side doors and trunk lid/tailgate to indicate if any of them are open or closed. On vehicles with an alarm there is a single switch on the hood. The switches are closed when the door or tailgate/trunk lid is shut.
When the alarm is activated, the central electronic module (CEM) checks every 3 times / second that the switches are closed. If the central electronic module (CEM) detects that a switch is open the alarm is triggered.
If the central electronic module (CEM) detects that a switch is not closed when a lock command for locking the central locking system and alarm activation is received, the vehicle tilt sensor and movement sensor will not be activated. When the last door or hatch is closed, all alarm functions are activated, including movement sensor/vehicle tilt sensor after the initial time delay of 11 seconds.