Brake lights on Volvo station wagon not working

99% sure you have a bad radio.

have you checked the fuse?

bulb failure warning relay has failed.behind your front ashtray last relay on the left .round one change it try on ebay.

http://www.autozone.com/autozone/parts/Duralast-Stoplight-Switch/2001-Volvo-V70/_/N-jetkaZ9cias?itemIdentifier=365252_0_0_

anti theft device

I have a 2001 volvo v70 wagon. My lower brake lights are not working but my 3rd (top) brake light works fine. I replaced the bulbs checked my brake light relay checked all fuses and ground wire and all seems to be fine, but the lower brake lights still doesn't work. I need Help!

you may want to check the fuel pump relay. this is a common problem

seat warmers.

Replace your brake light switch,also just replace the brake light fuse,sometimes they can have an very small crack in it,they you cant see.

Check you're ground.