Interior lamps won't work

Hello,
Recently bought a 2002 GTP.
I'm not sure when they went out but I noticed the interior lights no longer work.
None of them work including the ones in the back above the doors.

I know they were working when I bought the car for sure.

I recently had a stereo system put in but I don't know if it’s related.
The fuses seem to be good and I checked the dial dimmer switch to make sure it wasn't turned off.
Everything seems to be in order but they simply won't work. I can't even turn them on manually.
Any ideas?
Regards,
Tplayer

When you worked on the stereo system did you do any work around the body control module (BCM) located at the far left hand side under the dash by the emergency brake. Check the connectors and wiring there. The BCM controls the courtesy lights.

When you worked on the stereo system did you do any work around the body control module (BCM) located at the far left hand side under the dash by the emergency brake. Check the connectors and wiring there. The BCM controls the courtesy lights.


I don't know what they did. I had a high end sound system put in. They had they car for about 4 days so they could have worked in that area. I"ll call them and find out.
Thank you.