I removed my Pioneeer AVH-P4000DVD from my Tacoma pickup to upgrade to an AVH-X2500BT and installed the AVH-P4000DVD in my mustang cobra and found myself suffering from a strange issue (that seems to have happened to a lot of you too). All of a sudden I had lost my audio on my USB and AUX inputs. I tore the net apart for a solution, pouted, drank, and started doing more and more research, and check instruction manuals. I eventually found the solution based of one lone comment someone had mentioned regarding ground and comparing the wiring diagrams for the two decks. I pulled the pioneer harness out of truck and compared it to the pioneer harness in my car and found an inconsistency. This may solve the issue that plagues you as well. Check the harness you are using. I was not able to find a pinout, but the 4 wires on one end of the harness for the AVH-P4000DVD should be +12V battery, +12V ignition, ground, and ground, (yellow, red, black, and black). If you have received the harness for a newer model of pioneer AVH it will still fit fine but one wire is out of place. The second ground wire you need has been replaced by a purple reverse gear sensor for the backup camera. Ground out the purple wire and it should solve your issue... It did for me. Good luck.
Thanks a lot my friend I've the same problem and solved it with you answer... Awsome!!!
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