General information: Notes

CAUTION: Before beginning repairs on the electrical system:

Obtain the anti-theft radio security code.
Switch off all electrical consumers.
Switch ignition off and remove ignition key.
Disconnect negative (-) battery terminal.
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. See EMERGENCY (BACK-UP) BATTERY, SWITCH ON/OFF, RESET TIME REGISTER .
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. See EMERGENCY (BACK-UP) BATTERY, SWITCH ON/OFF, RESET TIME REGISTER .

Before troubleshooting or servicing, technicians must be familiar with the functions and operation specifics of the applicable standard or optional radio and telephone system as they pertain to the multi-function steering wheel. Always read the vehicle/radio owner's manual and review the radio, tape player, CD player/changer and telephone system functions as the pertain to the multi-function steering wheel.