I know this feed is a fue years old but just thought I would put this on. I'm on my holidays and out of the blue my radio has frozen with the volume, I can hear it but when your driving it is to faint to hear . It won't turn up or down but the on button and the button the other side you can access the bass treble fade and balance but it will not adjust. Been looking on the forums and depressing myself with a new head unit or amp. I've not got any tools with me but this afternoon I thought I would have a quick look. Found the amp then started looking at removing the head unit , I've stopped myself continuing and thought I really should try the fuses eventually found the 30amp (AMP) fuse in the fuse box looked at it and it seemed fine. For some reason (I never normally) I cleaned it and wiped it with WD40 the fuse and terminals and it worked a treat. 😁