1. What is displayed in the sceen - check the ICONs against the manual
http://www.gme.net.au/public/pdf/man...x4500-3_im.pdf . You may have enabled quite or CTSS mode,
2. have you jumped started the truck recently - did the set start playing up afterwoods. When you jump start you can creat a voltage spike - when you connect the cables that can kill electronic components