avic-n1 gps problem

[impalassdude]

have a avic-n1 that has been working great up till a couple months ago.now i have nothing coming from the speed senor pulse.it reads 0 and no mph.1st time i notice this i did get a error saying eratic speed senor or somthing like that.but now its nothing.i checked the vss wire going to the brain box and im getting power to there.plus i noticed the compass part isnt right.is there someting wrong with my brain box??everything else works fine.

thanks

[jimmy303]

Check your connection to the VSS wire, first. And, it should read an increasing voltage in AC, not DC. GM vehicles in that era generally used a dark green with a white stripe for VSS. Also, check your GPS antenna, make sure it hasn't fallen off of it's reflector plate or is sitting upside-down under the ashtray....