Radio turns on but no volumne

Alternator location replacement

This is a keyless car. Drove to store listing to music on the radio. Pulled into parking spot, put the brake on put the car into park and turned of car. I got in the car put foot on brake and touched… 

Radio display does not work. All other radio/cd functions work ok

Nejde navigácia potrebujem cd mapy

Radio works,but cannot see station or time, sometimes radio changes station by itself. CD player will not accept cd, when it does accept cd it reads Error. Also overhead console does not work any more…