how do you fix the sound on the bose system in a 2002 pontiac grandprix gt

It's not in theft lock mode is it?

help us help you...does it illuminate, request a code, power at all, just sound crappy like a blown speaker??? when you ask a q, it is helpful to insert as much info as possible, as a mechanic, there are infinite possibilities of issues.....

Right on john...... my favorite is...... "my car makes a noise". Makes you wanna rip your hair out and jump the service writer

From the very little info you have given I'd start with the fuse that powers all the little amplifiers that are attached to each speaker. If that fuse blows then its like unplugging all the speakers.

Chris, john, check this question out, asked shortly before this one. http:// www.cargurus.com/Cars/ Discussion-t16855_ds531766