Working On The Airbag System

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2015 Audi S7, 2015 Audi RS 7, 2015 Audi A7 Quattro, 2014 Audi S7, and 2014 Audi RS 7. However, it is still accessible from the selected car via links, so may be relevant.

WARNING:

When working on the airbag system (pyrotechnic components, Airbag Control Module -J234-, wiring), the Ground (GND) cable must be disconnected with the ignition switched on.

Exceptions: On vehicles with a battery in the passenger compartment, the ignition must be switched off.

Then cover the negative terminal.
After disconnecting the battery, a wait time of 10 seconds is required.
The battery must be connected with the ignition switched on.
There must be no one inside the vehicle when connecting the battery.

Make sure in this case to keep oneself away from the airbag deployment and belt tensioner zones.

If the ignition is not switched on after reconnecting the battery (the indicator lamps in the instrument cluster do not illuminate), the ignition (key/button) may only be switched on while sitting in the driver's seat in the rear most position.