So I'm getting a new head unit installed in my 2010 base WRX, I ordered a wiring harness from Amazon for my vehicle, when it showed up it said 2008+ Impreza/WRX/STi wiring harness, there was also a 2nd wiring harness in the box that had no label on it. When researching further it was a kit for 2007+ Nissan. My friend is doing the install (went to school for car/home audio) but before he gets around to it, I want to make sure I give him the correct parts. Do I need both wiring harnesses? I ask because the Nissan one looked like it was accidently tossed in the box, but I wanted to check to make sure.
Also, the head unit it a JVC KW AV50, I was reading that you have to do some wiring to the parking break, is there a way to bypass that (to allow playing DVD's with the parking brake down)? I'm not going to be staring at a DVD while driving down the road, it'd be more for my kid to be able to watch on road trips from the middle of the back seat. Thanks for any input!