Took my Passat in for its first service and dealer can't run the diags program because I have has a Blaupunkt DAB radio fitted and it is stopping the diag prog running. I understand that as the program checks the radio and if it can't run diags is stops the whole program. I remember something about a link or wire that needs to be removed from the radio din plug to disable this feature. Anyone know what that is ?

Dealer is checking with VW as well