So I attempted to install the AVH-P4400 in my 02 jetta wagon using the metra 70-1784 I got from Enfig. His harness has the turn-on lead (blue) connected to connector III pin 5 (anti-theft system control signal). I noticed that pin is constant +12VDC. It's not the new radio is it's constantly hot even with the new radio unplug. I found this out because I used the blue wire for the parking brake bypass relay which I could hear clicking when connecting or disconnecting the blue lead from the relay. So my question is; Should that pin be a constant 12VDC? If so, why would the amp turn-on lead be connected to it?