Help with Cd Player

[Future240]

So I recently got a Pioneer Deh-6000UB, shits great, cept one thing. If I turn on my subwoofer control (2 memphis 15"s, xlpod amp) my back speakers won't play. With it off, cant control sub, backs are fine. Suggestions?

[LeftNutOfGowd]

Return it...

[Gnnr]

Are the back speakers wired directly to the head unit? The subwoofer control?

[Future240]

^They should be wired directly to the headunit, and the sub control is built into the head unit.

Theory: I used the wiring harness from my previous pioneer cd player. The previous one was installed by someone who shouldn't ever touch another vehicle. The latter installed by an engineering major. Could the way the cd player is wired into the car make the cd player treat the back speakers as if they were subs. Which would make nothing but bass come out of the rear speakers, but since the subs are so overpowering it sounds like nothing?

[Gnnr]

So you bypassed the stock amp? Well, if they wired it wrong it could be the problem. I don't understand how you used the wiring from the last cd player? It should be like this:

OEM Wiring -> Wiring Harness -> Headunit Wiring

[Future240]

And yes the stock amp was bypassed when the first cd player was put it. I should probably note that i am talking about a 1988 Nissan Maxima, not a S-chassis

It is like that, I used the same harness because they were both pioneer cd players that used the same harness.

[Gnnr]

OEM Wiring -> Wiring Harness -> Headunit Wiring -> Headunit

The one in red and blue should have stayed the same. The Wiring Harness (in blue) is supposed to work with all aftermarket headunits. Now the Headunit Wiring is unique to the headunit it came with.

If this is the way you had it wired, then I would say that its the headunit.

[Future240]

Hm...........perhaps that means the problem is with the red to blue, cuz like I said that part was done by an amateur, I need to find a FSM and see whats goin on, thanks for the help Gnnr.