02bluetb said:
Hi I just bought a 02 trailblazer Ltd and it has a aftermarket stereo in it. The rear stereo controls and speakers are not working. I was wondering if this was because Of the aftermarket radio. I was thinking of putting a stock radio back in if this is the problem. The codes show I have a cd and cassette deck stock. I was wondering if I could just get the cd radio or the 6 disc Of if I need to have bose amp and stuff to work. I would just rather not have the cassette deck part. Thanks for the help
The issue could indeed stem from the aftermarket radio, without having a proper adapter. You could get a CD or 6-disc radio (both were offered in Bose and non-Bose I believe, check for RPO code UQA to see if the truck has/had Bose). You would then have to have the radio programmed (it stores all/part of the VIN as a security measure). I'm not sure if any aftermarkets even supported the rear seat audio in the first place, but they should all run the rear speakers. There may also be an issue with the RSA where it's turning off the rears.
You could also pull the deck and check the handiwork back there. If it's spliced rather than using an adapter, you could poke around at getting an adapter instead.