03 silverado w/bose problem

New here and hope this is in the right spot. I have a 2003 Chevy Silverado, ex-cab with an AM/FM/CD/Cass head with RDS and the Bose system, the truck also has On-Star. Few weeks ago I got in and the radio appeared to be working fine but no sound, next stop I get back in and its working again. This happened a few more times (getting in and out of truck has no effect) and now the sound is completely gone. First I checked all the fuses, then I checked the connection in back of the head unit, next I got the wire color codes and put a 9V battery across each set of speaker leads...nothing??? Dealer wants min $100 just to trouble shoot but says its usually the head unit which is $1100 new and between $400-$600 rebuilt. Local audio shops have no interest in fixing it, just want to replace which I would agree to do except I'll probably only have the truck another 6-8 months and after I buy a deck, an adapter kit, an on-star module, a door chime module, a steering wheel controls module, etc, etc I'm quickly over the $400 mark for a rebuilt. Any tips on how to determine if its the head unit, an amp or could the On-star have everything shut out? Will a replacement head just plug and play or will I have to get it programed? Oh yeah, doubt this has anything to do with it but a few weeks before the sound trouble, half of the preset lights went out, dealer told me only way to fix it was repair the deck (+/-$300). This car audio stuff has changed A LOT in the 25 years since I use to tinker with it.

Thanks for any advice

Your vehicle does have a seperate amp..however it is difficult to tell you if this problem is the deck or amp without further investigation. If you do not have another deck to plug in one way to check is to power up the remote wire at the dash..then when you tap a battery onto the speaker wire you will hear the pop at the speakers..if not it should be safe to assume the amp is bad.

And correct...if you want to retain the RAP, onstar, door chime , steering wheel controls etc. you will be in it a couple of hundred bills just for those parts..plus kit and antenna adaptor.

Best of luck

I would send the amp out for a repair estimate. If the quote is too high start diggin through the junk yards, ebay etc.

If you choose to use an aftermarket amp as a replacement most likely the deck will need to be replaced also, I am not sure about compatibility.