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- Fig. 1 End face of (open) driver's door: Button for interior monitor/tow-away protection
Applies to Audi A3s: with anti-theft alarm system
If the anti-theft alarm system senses interference with the Audi A3 it triggers an audible and visible alarm. The anti-theft alarm system is activated when you lock the Audi A3 in the usual way and is switched off again when you unlock the Audi A3.
The anti-theft alarm system comprises the following components:
Anti-theft alarm
The alarm is triggered if the bonnet, the boot lid or any of the doors are forced open. The alarm system is armed whenever the Audi A3 is locked.
If you unlock the Audi A3 by turning the key in the driver's door lock, you should switch on the ignition within 15 seconds to prevent the alarm from being triggered. On some export versions, the alarm is triggered immediately when you open a door.
To deactivate the alarm, switch on the ignition or press the 
button on the remote control key.
button on the remote control key.Interior monitor and tow-away protection
When the Audi A3 is locked, the alarm will be triggered if movements are detected in the interior (e.g. by animals) or if the Audi A3's inclination is changed (e.g. during transport). You can prevent the alarm from being triggered accidentally by switching off the interior monitor and/or tow-away protection. To do so, proceed as follows:
Press the 
button Fig. 1. The LED in the button will light up.
button Fig. 1. The LED in the button will light up.If you now lock the Audi A3, the interior monitor and tow-away protection will remain deactivated until the Audi A3 is unlocked again.
Safelock
The doors can no longer be opened from the inside. This makes it more difficult to break into the Audi A3 WARNING!. The message Be aware of door safelock. See owner's manual appears on the instrument cluster display when you switch off the ignition as a reminder that the safelock mechanism* will be activated. You can switch off the safelock mechanism* by using one of the following options:
Press the 
button on the remote control key a second time within 2 seconds. Or:
button on the remote control key a second time within 2 seconds. Or:Touch the sensor on the door handle a second time within 2 seconds (applies to Audi A3s with convenience key). Or:
Turn the key in the door lock to the lock position a second time within 2 seconds.
The alarm is triggered if you switch off the safelock mechanism* and a door handle is then operated. To deactivate the alarm, switch on the ignition or press the button on the remote control key.
button on the remote control key.Do not leave anyone (especially children) in the car if it is locked from the outside and the safelock mechanism* is activated: the doors and windows cannot then be opened from the inside. Locked doors could delay assistance in an emergency, potentially putting lives at risk.
Caution!
If you switch off the safelock mechanism*, the interior monitor and tow-away protection are automatically disabled, and vice versa. This means that your Audi A3 is no longer completely protected against theft.
Note
The interior monitor and tow-away protection will only function as intended if the windows and the sun roof* are closed.