Removal
Disconnect the battery ground.
Attention: When the terminals are removed from the battery, the memory in the radio receiver and electronic control units is erased. Receivers installed in series on AUDI cars are equipped with a security coding system. It does not allow the receiver to be switched on after a power failure. The power may be interrupted, for example, when the cables are removed from the battery or when the corresponding fuse burns out. If the receiver is coded, you must know the code before removing the cables from the battery. If the code is unknown, the receiver can only be put into operation again by a VAG service station.
The individual code of the receiver is given in the operating instructions of the receiver. It should not be kept in the car.
Insert two handles-pullers "A" into the holes on the front panel on the left and right. If there is no hole, remove the control heads and the cover. Insert the pullers.
Pull out the receiver without distorting it.
Mark (left/right) and disconnect the speaker connectors. Remove the antenna. Disconnect the plug connection (+) of the battery and ground. For digital instruments, disconnect the power plug (terminal 30).
Remove the pullers. To do this, press the clip-holder with a small screwdriver.
Installation
Connect the electrical wires and antenna to the rear of the receiver, see Removal section.
Insert the receiver into the instrument panel until the springs snap into place.
Connect ground to the battery.
Turn on the receiver and check its operation. If the receiver is encrypted, set the secret code first.
Note: If the radio receiver is installed additionally, it should be matched with the antenna. To do this, tune in to a weak signal in the medium-wave range and adjust the receiver with the adjusting screw with a small screwdriver to the maximum signal.
Instructions for self-installation of the radio receiver
The factory fitted connector fits all VAG fitted radios with a separate connection for the gauge illumination.
For other receivers there are VAG adapters.
Caution: If the adapter cable is not used, pay attention to the fact that there are no uninsulated wires. A possible short circuit will cause the cable to burn out.
Please ensure that the correct anti-interference kit for this type of vehicle is used, otherwise the vehicle may be invalidated.
[Information obtained from this resource: AudiManual]