I have recently completed the installation of an AVIC-Z110BT in a 2003 Porsche Boxster. The installation includes the “Hack”. I have the moved mute wire one hole to the left tying it and the parking brake wire together and tied them both to the original radio ground wire. I have the VSS and backup wires hooked up to the Z110BT. The system operates, navigating and playing music.
The problem is that the car doesn’t track down the road accurately, the road being laterally displaced 200-250 yards to the side if the car is on a cardinal heading, i.e., north, east south, west; 0-50 yards if the