Before beginning repairs on the electrical system: Obtain the anti-theft radio security code. Switch the ignition off. Disconnect the battery Ground (GND) strap. On vehicles equipped with Audi Telematics by OnStar , switch-off the emergency (back-up) battery for the Telematic/Telephone Control Module prior to disconnecting vehicle battery Repair Manual, Communication, Repair Group 01 .
After reconnecting vehicle battery, re-code and check operation of anti-theft radio. Also check operation of clock and power windows according to Repair Manual and/or Owner’s Manual. After reconnecting vehicle battery on vehicles equipped with Audi Telematics by OnStar , switch-on the emergency (back-up) battery for the Telematic/Telephone Control Module Repair Manual, Communication, Repair Group 01.
Component locations, overview
WARNING! Observe all safety precautions before starting work on any part of airbag system Page 69-58 1 – Airbag unit – driver’s side Removing and installing up to 08/97 Page 69-86 Removing and installing as of 08/97 Page 69-92 2 – Airbag unit driver’s side (sport steering wheel)

Source

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