Odd grounding(?) Issue

[gto400no1]

Hey guys, been working on this thing all day with no luck. Tried searching but really I just plain don't know where to start. Heres the deal, I have a 97 Maxima with the stock bose speakers and had subs hooked up via a PAC AOEM-NIS2. Decided to put an extra headunit I had into the car. Removed the stock headunit as well as the PAC box. I install a new PAC box that is designed to let you put an aftermarket unit in without replacing the speakers (PAC ROEM-NIS2). Suddenly I have noises like I've never heard before (and I've installed plenty of car stereos over the years). When the car is running I can hear the engine through the subs and just the subs. Regular speakers are clean and crisp with no back noise. Even worse, when I move around wires in the dash or move the physical headunit I get a thud through the subs. Also when I switch audio modes (fm, cd, aux), I get three thuds each quieter than the one prior. No audio wires are crossing power wires. Like I said I had subs in the car prior just hooked up to stock with no issues. I grounded the headunit to the chasis not the actual wire harness (though tried it with it going to the wire harness with no difference). This problem seems to major to be solved by a ground loop isolator, correct?

I'll also note that the antenna is not connected at the time as I need to get an adapter, not sure if any odd chance that would matter (I doubt it).

What you guys think?

Headunit is a DEH-P5900IB by the way.

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[DukeNut 10+ year member]

pico fuse on the pioneer? i don't understand why there is no noise in the door speakers though. try to ground the rcas to the hu. search for pico fuse issus on pioneers.

 

[gto400no1]

I'll check the pico fuse. Thing is it's not a typical engine noise. It's not a whine, it's a groan. In fact it sounds like an exhaust leak (until I shut the amp off of course). Pico fuse only has to do with the RCAs correct? Because the speakers are not run off RCA.

I'll dive into that pico fuse more, also want to check the bass remote on the amp, read somewhere they could cause issues too.

 

[Cassinova 10+ year member]

could be a bad unit try getting it replaced. shiit happens.

 

[gto400no1]

I have the headunit open and I'm looking for the Pico Fuse. I can't locate it. Anybody know where it is located on this unit (DEH-P5900IB)?