avic d3 parking brake

I have two questions concerning unit. The instructions say hook the brake wire to the supply side of the parking brake. I put the unit in a 2003 Infinity G35 sedan. The parking brake switch only have one wire. This wire measures 12 volts when brake is not engaged and ov or ground when parking brake is engaged. However unit is still saying there is an improper connection. I have read it must go through calibration to know that it is actually hooked to the correct wire. The other question was, I have read that you should hook the mute wire to the brake..it made no sense to me, but you never know.

i am having problems with

when the navigation is on and the radio is on in the background after a little time (no any amount of time ) but the audio for the radio cuts off and he only way i can get it back on is unplug power and replug it back in and then hitting the reset button.

now here is the stanger part ,if i plug the ipod i hear music as well as well as if i put a movie in (mean ing that the internal amp is still working and i can here the dings from pushing the touch screen ,

it is acting like when it goes it to the interupting talk mode for directions it freezes up the audio source on the radio and never resets back to radio .

any clues out there ???:confused: .