Pioneer AVIC-Z1 Install

[HummerNewbie]

Originally Posted by f5fstop

Only problem I have noticed is there is alternator whine when using the Onstar phone. I plan on installing a coil in the power circuit (kodiacz recommendation), if I can find one around here. I might even run a large gage ground from the point I used, directly to the battery. If you don't use the Onstar phone, you may never notice it.

I get the same alternator whine but have not taken the time to get rid of it since I have hardly used the phone since the install. I also think that maybe the adapters have something to do with the units not powering up sometimes. This past weekend when heading to Tellico I had it shut down once about 30 seconds or so after powering up. Shut the truck off, restarted and it powered back up just fine.