Pioneer Avic-D3 - Need help, unit was installed 2 weeks ago and worked fine, installed new battery 3 days ago, worked fine, last night a slight hiss from the head unit started, help...

From the deck or from the speakers?

Pioneer Avic-D3 - Need help, unit was installed 2 weeks ago and worked fine, installed new battery 3 days ago, worked fine, last night a slight hiss from the head unit started, help...

It comes from the unit only, very slight, but irritating, thanks for your reply...

There's a fan in the unit that keeps all the electronics cool. Nothing you can do about it, aside from opening it up and disconnecting the fan, which would cause the unit to overheat.

You are the man, I went and listened closly to it and you are exactly right, right when I shut off the car, the sounds continues for a moment as if a (fan) is slowing down, I thought it was the nav CD, sounded simular to a CD slowing down. Would it make sense to go and reduce the zoom so that the nav CD does not have to run continually? Or when it runs, it runs, the fan that it is....So grateful!!

Even when you're not using the nav and it's net being displayed, it's still operational... So it does help to zoom the map far out if you're not going to be using the nav. It reads from the disk a lot less often that way.

Hi mate im having the same problem except with the F900BT. Check my post in the F series troubleshooting to see if its the same thing your experiencing and let me know

Actually mines a speaker hiss caused by the unit. So its a different problem