Hi,
I connected all wires for the P5200BT according to the manual (12V+,Gnd.,ACC,Light,Remote,Brake) but the HU doesn't turn on. I also pushed the Reset button several times but the unit is just dead.
So I disconnected everything again and used only the Yellow wire to the cars constant 12V+ / Black to the Ground wire of my car and Red to the ACC. Still dead, no noise, nothing. I measured the voltage at the pins from the unit and all got power as supposted to be. It also doesn't matter when I interconnect the ACC to the constant 12V+.
So I figured the HU must be bad and returned it