I didnt know HU's could go into protect. did you pull it and check the fuses? maybe just the fuse blown?I was putting in some speakers and a new batt, was all done and was connecting the batt to neg/pos when my wrench touched the alt...Spark.... now my head unit powers up but in protect.
Help?
Its a Kenwood KDC-X692
or this.. idk your h/u and too lazy to google..take the face off there should be a little pinhole with a button in it.