Usually when a specific component doesn't work there is a circuit issue or the component itself.
Has the battery been jumped or any accessories been added? Replacing the battery will put the radio into a security mode requesting a code to regain any functionality. Any aftermarket components installed like a dvd player, blue tooth, radio, etc?
If the fuses are good (refer to the owner's manual for each fuse box, because there is usually more than one) and the circuits to the radio and time good then its the radio and compass/time units that are bad.
Let me know if you have any questions.
Tuesday, December 3rd, 2013 AT 7:25 PM