Okay guys I'm trying to get my new nav system in and am having some issues. I'm using a GMOS-04 adapter. Everything works good except I have no sound from the rear speakers or sub. I can hear a faint buzz from passenger rear speaker when I put my ear to it but no sound is playing from anything except the front door speakers and tweeters.

Anyone have an idea or what might be going on?

Thanks,
Spencer

 

This is a shot in the dark but I've read some bad reviews about the Axxess GMOS 4 being a lackluster product. Seems like many were defective or had some sort of install problems. I'd try other venues, maybe Google will yield better answers to your problem. Good luck.