A4, A6, A8, S4 & TT
- Obtain radio anti-theft code from vehicle owner and write down preset radio frequencies. To disable air bag system, ensure ignition is off and remove key. Disconnect and shield negative battery cable.
- To activate system, turn ignition switch to ON position. Ensure no one is inside vehicle and connect negative battery cable. Perform a system operational check to ensure proper system operation. See SYSTEM OPERATION CHECK . Input radio anti-theft security code and reset radio frequencies.