Volvo: problem with radio,sunroof and 12 volt plugs

Question
i have a 2000 volvo s80 and the radio,sunroof and 12 volt plugs do not work.is there an easy fix and what is the problem will installing an aftermarket radio fix this problem.  thank you

Answer
there could be a fuse issue here ,under the driverside kickpanel there is the fuse box and cem ,check the fuses there also possible that the alarm siren could be what is not letting the sunroof function .Check for a blown fuse first the 12v could be the source ..