Instruction book AUDI A4
 Audi A4   Controls   Doors and windows  Central locking system
Applies to Audi A4s: with anti-theft alarm system
If the anti-theft alarm system senses interference with the Audi A4 it triggers an audible and visible alarm. The anti-theft alarm system is activated when you lock the Audi A4 in the usual way and is switched off again when you unlock the Audi A4.
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 A4 is locked.
If you unlock the Audi A4 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.
Interior monitor and tow-away protection
When the Audi A4 is locked, the alarm will be triggered if movements are detected in the interior (e.g. by animals) or if the Audi A4'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.
If you now lock the Audi A4, the interior monitor and tow-away protection will remain deactivated until the Audi A4 is unlocked again.
Safelock1)
The doors can no longer be opened from the inside. This makes it more difficult to break into the Audi A4 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:
Touch the sensor on the door handle a second time within 2 seconds (applies to Audi A4s with convenience key). Or:
Turn the emergency 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.
WARNING!
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 A4 is no longer completely protected against theft.
Note
The interior monitor and tow-away protection functions will only function as intended if the windows and the sun roof* are closed.
1) This function is not available on all export versions/equipment versions.

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