So my head unit decided to act up. I was driving down the road and the speakers just shut off. The subs did not. So I figured maybe a loose wire or wire touching/backwards. Traced all lines no loose wires and one backwards. So I reverse the wire and it worked. Then driving down the road again it stopped again. rechecked wires nothing wrong. turn on radio to check and it worked. It will work for about 30 mins or so then only work when I hit a bump or take a speaker out and reinstall. Checked for pinched wires and none. This is an after market unit.

What do you think? Replace head unit?

 

Im having the same problem but mine wont come back on. I knew i should of read this before i posted.

 

Check your harness make sure no wires are loose. Then pull one speaker at a time to check load. That usually works for me. I do not know why mine is not supporting the 4 speakers I have on it. I will be upgrading sooner than expected to a single din touch screen DVD player unit.

 

I think it is a Pioneer thing.