The head unit in my '06 MCS has stopped recognizing my auxiliary input recently. When I initially turn on the car, it works for only a few seconds and then cuts to the CD or radio. If I switch to either of those and wait for a couple minutes, AUX reappears but only works momentarily. I disconnected and reconnected the cable that attaches to the back of the hu, but the problem still persists. Has anyone else experienced this?

 

Do a search on Ground Loop Isolator

Or look at this thread.

 

Are you sure it's plugged in all the way? I had the same issue on my R50 when I first installed the Aux In, and even though I thought it was plugged in all the way it was actually a little loose.

 

Thanks for the quick responses. I realized that I have been charging my iPhone and listening to music at the same time, and if I unplug the charger, AUX works. Ground loop isolator it is.