noob here. Help Oem bluetooth mic & reverse signal

[abraj]

I have 2008 nissan altima coupe. I have all the wiring done correctly just need to know if i could hook up the oem mic, or know how to splice it to work with the connection for a Pioneer AVH-X3500BHS DVD Receiver and where to patch into the reverse signal relay. A lot of the forums say to patch in to the reverse light, but is there a closer option and if so what would the color wire be? Any help would be greatly appreciated.

[AlexN09]

I simply ran a wire back to the reverse light, but you could certainly find where the light was running through the cabin. You could just find what color the wire was at the bulb and then look at the loom running through the firewall above the dead pedal.