Re: where is the motion(pbrake) wire for nav?
I won't say disabling this signal will not allow the system to be changed while driving; however, on most of the newer Navs GM is using, the VSS is only used to help supplement the GPS signal (similar to aftermarket Nav systems). There is a good chance the serial data link is used to tell the Nav system not to allow all functions to work.
I would be curious if disabling the VSS does anything, but set a code. Good luck.
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