I have the Harmon system with the CD changer in my car and also the factory Motorola phone. My head unit sometimes does not turn on and other times it does but all the controls are frozen. I pulled out the phone and the phone “box” from the trunk but still these symptoms continue. I have swapped out the head unit with another and still have the same problem. Does anyone have any suggestions? I do have another Harmon amp on the way to try.
1974 E type OTS