98 Prelude Head Unit Problems

My buddy and I were re-doing a friends audio system and tripped something on his alpine HU.  We reset the computer and then the guy's who's car it is rewired the remote turn on lead and all was well.  Then he opened the driver's dorr and the radio swictched off.  He closed it back and the radio turned on again.  The same thing happened with the passengers side door.  We tried for hours to figure out what was causing that.  This is my first post on here and I have read over the forums and have found them very helpful.  Any help on this subject will be GREATLY appreciated.  Thanks a lot.