So...I just recently finished installing my Pioneer AVIC-D3. I also installed the Metra GMOS-04 (Bose and OnStar) harness and PESWIPS steering wheel control harness. I know (as far as I know) I soldered all the correct wires together. Now, the only time I get any audio through my speakers...is when my door is OPEN. When I close my doors and/or start my truck, all audio is muted. I get absolutely nothing at all.

Does anyone here have any suggestions on how I should go about fixing this or what is causing this to happen?

sounds like you wired your mute/att wire to the door switch

I would go back and check your wiring again.

Actually, man...I just went back and rechecked my wiring. I didn't wire my mute switch AT ALL. Maybe this is my problem?

Does the AVIC stay on?

It sounds like somehow the amp turnon isn't hooked up correctly.