thanks danny for your reply it is a 2001 gs300 2jz vvt engine i fitted a aftermarket radio aeriel and just after the cd did not work on the gps mapping.
i took the cd out and found gaps missing on the white paint of the cd. after removing the reader unit in the boot & tapping white flakes came out.
looks like i might just need to find another cd and maybe clean the play unit it still turns when powered up. like to keep it original as best car i have ever had and plan to keep a while longer
thanks if you have any suggestions it is appreciated, texinalex