Hello, I have a 99 STS and the radio went dead the other day, it still powers up, and functions, display both cd and cassette and radio, but I get NO sound anywhere, is there a seperate amp or fuse for the amp, or is the radio / cd player shot.. Thanks. Joe

 

Check for codes. Yes, there is a separate amp.

 

do you have owners manual? check for relay. its under rear seat.. also try disconcting negative battery for 20 min and reconnect. let the Forum know how you made out....
rickyd