I just upgraded the Z1 HDD to the Z3. I had the circuit board that bypassed the parking brake. Now I can't do anything. Won't even let me add address. What happened? Shouldn't the circuit board work with the Z3? Even in park it doesn't let me do anything. None of the buttons are highlighted. Please help.

since you upgraded to the Z3, i dont think you need the circuit board any longer. I think all you need to do is the two wire ground.

Oh ok, great. I'll try that. Thanks a million