My woofer has stopped working. The rest of the audio works fine, so amp is OK. Hot wire fuse to the speaker is OK. Can't find the G305 ground that is on the right c pillar. Where is the right c pillar?

 

The C pillar is between the rear door and the back windshield.

A common cause for the woofer to stop working is the relay in the amplifier box is subject to cold solder connections that break free from the printed circuit board.

Here is a couple of threads for you to read. If you want more, SEARCH for bose woofer relay or bose woofer cut out.

https://maxima.org/forums/5th-genera...-once-all.html

https://maxima.org/forums/5th-genera...00-maxima.html