Recently purchased a 4th gen with the BOSE speakers and a aftermarket Pioneer head unit. Sounds decent on the 3 speakers that work, but the passenger rear has no output. Tried other BOSE speakers, traced wiring up to front seats, checked connector, all no help. My questions:

- If the former owner put in the aftermarket head unit but did not use a BOSE speaker converter, would this be a likely symptom?
- If the former owner put in the aftermarket head unit but did not use a BOSE speaker converter, wouldn't the other 3 speakers sound like krapola?
- Are there any fuses, breakers, or resets on the BOSE speakers or amps?
- Any suggestions?

Almost ready to dump the BOSE speaks and drop for a AMP and new conventional speaks, but trying the economical method first.

Thanks!!!

 

Just save yourself the frustration and buy all new speakers.