ASK/Audio System Controller

Start microphone test by pressing Display. 

As soon as the beeping tone stops, deactivate the diagnosis request by pressing Display  again.

If the test returns not connected  as its result, start the test once again and make "noises" towards the vehicle microphone during the beeping tone.

The same applies if a Top HiFi amplifier is fitted in the vehicle, as in this case no beeping tone can be generated.

If this is not successful either, check the coding and correct if necessary.

If the coding is correct and the result is still not connected,  check the connection of the vehicle microphone to the CCC according to the connection scheme and replace the vehicle microphone if necessary.