I did some testing this am and it seems that only 0x062 - 0x065 needt to be FF or 00 and its disabled. Also, odds are its a switch like you said. Vag cars have a have 2 bit switches to disable immo. The odds thing is I can't believe it doesn't set a code for not updating checksums.antus wrote:This is a Bosch platform, and even though it was used by GM, it is a completely different heritage to the delco/delphi pcms and a different way of doing things.