Glass Breakage Sensor

The sensor is sensitive to noise (microphone) and senses if a car window is broken. It is built into the interior lighting lamp in the roof and is connected to the control module via pin 7 (signal) and pin 5 (ground). The separate ground input for the sensor has a filtering effect to avoid potential differences between the control module's main ground and the sensor's ground input.

When the theft alarm is armed and a window is broken, the sensor sends an analog signal to the control module in order to set off the alarm. There is also a button on the sensor to manually disconnect the glass breakage sensor. When the disconnection button is pressed, disconnection is achieved by 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 seconds 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 between +7.6 and +8.5 V.