ok so now i have the avic z2 bypassed correctly it seems (work done by local installer) only issue i have now is my gps arrow starts pointing sideways and even backwards at times when the vehicle comes to stop it will correct (if sitting long enough) any ideas as to what may be wrong here, im taking it back to the shop in the morn

Did they connect the VSS and reverse wires? And what does your GPS reception look like in the connection status screen?

vss is not im for sure, the reverse wire i dont know i dont have the back up camera though would that make a difference ? i really think it revolves around the vss wire, question is will it effect the bypass hooking it back up gps reception is great

Why would it *A*ffect the bypass?