Is there anything in common with getting power to the radio/cd player and the power driver's seat, or is it just a fluke that they seem to have quit working at the same time?

 

Possibly the BMS, Battery management system. Did you see a battery indicator light come on? Just for giggles, put a charger on your battery for a while and see if it's all restored again. The BMS will cut power to certain power things to conserve.

 

Explicitly identify what you are working on. We're not psychic.