I used to have a sony head unit..just put in my Pioneer Avic D3..and now i can hear whining in the backround? Any suggestions...I did do the bypass do to think I need a bigger ground?

 

i've only ever had this problem once. but the only time i had it, i took my head unit out and spread out my power/remote/ground wires from my speaker wires as much as possible and it seemed to take care of it.

 

Ive never had problems with this with my old head unit...does anyone who have the d3 have this problem?? I know it is a popular problem on Avic411 forums but I wanted to see if you guys new any tricks?

 

well i dont have that problem and i also bypassed the amp. And mine has been in for almost two weeks

 

check and see if your rca patch cables (if you are running them to your amp) are touching the frame when it comes out of the headunit.

 

alternator whine is caused by ground looping.....its complicated to describe but the best and most common way to get rid of it is to run your power and grounds from your deck all the way back to the same place that you power and ground all your amps...every ground in a stereo system should be connected to ONE common point in the vehicle to achieve the best possible sound....another thing that people dont check is the actual antenna wire....antenna's attached to after market decks will affect the ground looping because they are grounded at a different point than any other wires.....i suggest unplugging your antenna wire from the deck and see if your "whine" goes away.....if its still there then try to move your constant power and ground wires from the factory harness to the back of the car where the amps are wired......Hope this helps.....Boadie

 

trying re-grounding the ground wire to something else then the harness(ex. cigg plug, or a blot somewhere on the frame around the radio.

 

This is a good point. If you have those RCAs with metal ends, and one of the ends is touching metal, you will get alternator whine. It happened to me and it was a bitch to figure out until one day I slid the deck out of the dash a bit and the whine mysteriously stopped, and I was able to trace it back to the RCAs.

 

yeah i can see that happening bandit..but do you think having such long power and ground wires its good?

thanks for the advice everyone..

 

Do you mean running the power and ground wires all the way back to the amp as suggested earlier in this thread? No, I wouldn't do that. Ground the head unit to bare metal somewhere under/behind the dash. Mine is grounded to a bolt on the side, behind the panel that your right knee touches when you're driving. If there is still noise, you could try running another wire from that point to the point your amplifiers are grounded, as a "source ground."