I was wondering if anyone is having a similar problem. I installed a gmos 100 wiring harness in my 08 sierra,it has all the connections vss, backup signal,sw controls. As soon as I hooked it up and reset my Z2 and calibrations it works perfect except when I come to a stop,it will always move ahead of stop..Which will cause the avic to recalculate a new route..
I thought it was the Avic that was the problem. Turns out its not because I installed another Avic Z2 I had in my VW that worked perfect and it is doing the same thing.
It calculates perfect except when you come to a stop, if I move