Check fuse 28 in the passenger fuse box. That is for the large Bose bass speakers in the doors.
If that is not it then it is your radio or the Bose signal processor. I can provide guidance for removing the radio first to test it.
The radio sends it's initial output to the Bose signal processor. From there the processor sends the signal to the front Bass speakers AND back to the radio. The radio then sends the signal to the rear speakers and the two other front door speakers. An amp is in each front door for those bass speakers and the radio provides the signal amplification for the rears and the other two front door speakers.
The is no Radio Module Power Supply.
Check fuse 24 in the I/P box also. It says Antenna but it also provide power to the signal processor.
Did you replace the radio because of this issue?
The signal processor is next to the gas petal.
Sam was a Super Dude and good friend. He is missed,I don't have a pit stop anymore cruzing home from Fla! Sam was a real hoot too, He defiantly called them like he seen'em!Greendot, I'm sure Dadaroo would be thrilled that his solution helped you with your problem. However we lost dadaroo a few years back now. Just thought you'd like to know.
I wondered why I never see any posts from him anymore. He was a smart likeable man. I know it sounds tacky after the fact, but I'm very sorry to hear this and my condolences to his family......Greendot, I'm sure Dadaroo would be thrilled that his solution helped you with your problem. However we lost dadaroo a few years back now. Just thought you'd like to know.