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Glass breakage sensor

Glass breakage sensor


Glass breakage sensor

The sensor is sensitive to sound (microphone) and senses if any of the windows is broken. It is integrated in the interior lighting lamp in the roof (cabriolet: beside the rear-view mirror) and connected to the control module via pin 7 (signal) and pin 5 (ground). The separate ground input for the sensor has a filtering effect in order to avoid potential differences between the control module main ground and the sensor ground input.

When the theft alarm is armed and a window is broken, the sensor sends and analogue signal to the control module to set off the alarm. There is also a button beside the sensor for manual disconnection of the glass breakage sensor. When the disconnection button is pressed, disconnection happens through the control module sensing a change in the signal level.

Connection



The sensor is connected when the rest of the theft alarm is armed.

Manual disconnection

The sensor can be disconnected using the disconnection button as follows:


• If the button is pressed when the theft alarm is not armed and the ignition is off, the sensor will not then be connected when the theft alarm is armed. When the button is pressed, the LED flashes once every second for 10 seconds. If the theft alarm is armed before this, the LED goes to being lit continuously (normal 10 second delay).

• The sensor can be reconnected before the alarm is armed by turning the ignition to the "ON" position (+15).

• Otherwise, it is necessary to disarm the alarm and then arm it again so that the sensor will be connected with the rest of the alarm.


Automatic disconnection

The sensor is automatically disconnected in the following cases:


• If the theft alarm is disarmed.

• If only the tailgate is disarmed/unlocked.

• If a door or the tailgate is open as the alarm is armed.

• If the voltage drops to < +8.5 V.


Cabriolet




If the soft top is down, the glass breakage sensor should be disconnected manually with the disconnection button in order to avoid false alarms.