Audi A3  Setting off  Doors and windows  Central locking system
If the central locking system should fail to operate, the driver's door can still be locked and unlocked by turning the key in the lock.
To unlock the driver's door, turn the key to the unlock position -A-.
To lock the driver's door, move the selector lever to position P (automatic gearbox) and turn the key to the lock position -B- once WARNING!.
In order to switch off the anti-theft alarm*, you must switch on the ignition within 15 seconds after opening the driver's door. Otherwise the alarm will be triggered.
The system will unlock either the whole vehicle or one door only, depending on the settings you have chosen on the driver information system* (MMI*) Link.
On vehicles with an anti-theft alarm system*, 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 Link. Locked doors could delay assistance in an emergency, potentially putting lives at risk.
Applies to vehicles with start/stop system and START ENGINE STOP* button: The ignition remains on when the start/stop system stops the engine. Before leaving the vehicle, ensure that the ignition is switched off Link. Otherwise it will not be possible to lock the vehicle.
For further functions of the remote control key/convenience key, please refer to Link.

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