I recently installed the F90 in my 2007 Jeep Cherokee and it works great expect for the nav audio. The radio cuts the av source audio out and tries to give directions but no audio. This is the same for the bluetooth phone connection. I found this on the Z forum and wondered if it would be the same for the F90:
“Either way you have it hooked up wire for wire and you matched them up properly. BUT when you have an amplified system like im sure you do you must hook the front outputs from the radio to the rears on our harness.
Reason is.....
the factory amplified system has two channel input. It then gets fed to the factory amp and the amp sends signal to all speakers. The two channel input just happens to line up with the rears of a system that’s not amplified. So right now I bet if you fade to the front you will loose all sound. Fade to the rear and you will get all sound back. If that’s the case hook the white and gray wires to the green and purple wires and you should be good.
BTW.. Whites goes to green
Gray goes to purpleâ€
Here's the origional post: