I have a 1996 Nissan Pathfinder and a DEH-6900UB and having some weird issues with it.
I have had the unit installed for aprox. 6 months with no issues in my current car. The issues started a few days ago when rolling down my front drivers window i let it go to far and it bumped my Polk MOMO 6 1/2 and I heard a loud "booming sound" with an electrical snap to it as well. Immediatly after a very very loud ground loop and electrical buzz were present (I had no issues before this). The ground loop comes from the 4 door speakers (front and rear) but not my tweeters in the front, which are stock and powered by the head deck not the amp. I did not have time while working the past few days to look at anything but finally got some time off and went to look at it.
After examining the front right speaker for maybe a wire bent over and touching the door sheet metal or something nothing. Moved onto the amp which is a Power Acoustik SL4-1000, checked ground cables, RCA runs, speaker cables, and power cables for any signs of a short and nothing.
I pulled out my head deck and decided to break down its install to scratch and start over. After checking all the wires and everything for shorts I rewired down to the most basic possible install. Power, Ground, and RCA leads, and amp turn ons. (no sat hooked up, USB, tweets, or anything). Powered up and the whine was even more prominent, even to the point it was hurting my ears.
I powered down and then decided hey this is a ground whine, im at a loss, lets see if the unit will power on with just RCA and Power hooked up, no ground even close to the unit.
And to my extreme suprise the unit powered up just fine. Again the unit was not grounded in any way, no wires were touching the rear of the unit other then what was plugged in...and it powered right up. The whine and electrical buzz were extremely loud, much louder then before. But the unit still powered on and I could hear the radio playing.
I powered off and at this point noticed that my amps (mono and multi channel) were still getting power. Now mind you I have everything wired to the head deck as it should be, IE the head deck is wired via ACC wire and Power wire being wired correctly so the unit shuts off with the car, but still draws slight power to keep the clock correct ect with the amp turn on wired to the head deck amp turn on correctly.
Another reminder, the head unit is NOT grounded, the car is completely off and the head deck is turning on the amps.
So ive come to think it is something in my head deck is shorted and somehow grounding it self (it powers on without being grounded).
If anyone has any ideas on where I should go, thinks is should post some more info please I beg of you chime in.
Or if you think I should just pick up the pioneer Avid-d3 Ive been eyeing but really cant afford let me know. (I want to stick with pioneer since i currently have a sat tuner for my pioneer and dont want to change that).
P.S. I apologize for the long post, but I wanted to get as much info in as i could. And explain the problem as well as i could.
