Repairing the central locking system

WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2008 Audi S4, 2008 Audi RS 4, 2008 Audi A4, 2007 Audi S4, and 2007 Audi RS 4. However, it is still accessible from the selected car via links, so may be relevant.

Central locking system in the A4 operates electrically instead of pneumatically as before.
Actuators in doors are integrated in the door lock and have 2 motors.
Actuators cannot be replaced separately.
The first motor locks the door and the second motor locks the interior door mechanism (Safe function).

Now, doors also can no longer be opened from the interior.
Actuators of fuel filler flap and rear lid have one motor each and cannot be replaced individually.
After an accident in which the airbag deploys, the central locking system control module opens any doors which were locked.
Central locking system control module is located in front of drivers seat, at left, under floor mat.