Electrical - Rear Running Lights

Hi, on my Nissan Sentra 2003 SER, the front headlights, signal lights front/rear and flasher are working fine, but rear running lights, dash board, and radio are dead. Not entirely -- the radio on turns on, there is no sound. All other electrical systems seem fine -- interior, defog, etc.
I don't see fuses for rear light, or radio. How do I get the big fix on this one?
Thank you for helping out,
Hardy