More about a car radio [View all]

I posted a question about an "Audio Head" broken that prevents me from getting Sirius

https://democraticunderground.com/12053642

But I wonder whether it is more. I can select a station (FM now) among a pre selected list by using the up or down arrow mounted on the steering wheel. Recently however this function does not always work and at the same time neither is the tuning button.

Turning the radio off and returning to the main navigation screen does fix this. I don't know whether the screen changing is necessary; it is just what I did this morning.

Thus I wonder whether the "Audio Head" is responsible also for changing stations.

Too complicated..