Here's a thread stating the same kind of thing.

https://www.crossfireforum.org/forum...ad.php?t=18234

I hooked up my AM head unit just fine. Not sure if there's a difference. I'm about to re-wire my whole car anyway as I got new speakers and an amp but just do it yourself and if there's problems then take it somewhere.

Could it be something with the LCD/DVD. I know some people have these kind of head units in their car no problem.