2 things: I am looking at the instructions to how to bypass by grounding 2 wires. I had grounded the parking brake (light green from unit) and the system works (bypassing) w/o grounding the last pin on connector 2. Anyone know why? Also I see the instructions that some peeps relocated the "cell phone mute" wire to the last pin on connector 2 and grounded that...only thing is, I CAN NOT find (and not shown in instructions) where the original location of the "cell phone mute" wire is, in order to use it. Anyone know the original location of the "cell phone mute" wire?

Oh, and I grounded the light green to my chasis.

The second wire in the bypass will keep the Z from giving a "braking brake wire" error. If you do not ground the second wire, it will eventually give the error. The cell phone mute wire is originally in the "RCA 1" connector. See the attached pinout.

Thanks once again!