Have you pulled the seat heater switch out? From the BRZ wiring diagram(see below), it looks like the switch has a bunch of terminals. I'm just not sure what all the outputs do.
The White wire(IG) on the top is the +12V from the ignition relay.
The Black wire(E) goes to ground.
If you plan on using those switches, we will need to test them to see what the RV and SW wires give in each switch position.
Another option is to buy your own switch and mount it to a plate like this:
[ame]http://smile.amazon.com/2013-Scion-Console-Plate-Black/dp/B00CXAPVEK/ref=pd_sim_auto_4?ie=UTF8&refRID=0ZMGP32GET6DGBSZZ PDK[/ame]
I guess decide which you want to do and we'll work from there.
Your questions:
How can I get access to pin 13?
Autoharnesshouse.com sells them. others will probably sell them too.
What is "30" - 30 is the common of the relay. When the relay coil is on, 30 is connected to NO(87) contact. when the relay coil is off, it will be connected to the NC(87a) contact.
Do I need to switch the video pin for the cameras?
You don't need to, but it is best to avoid cross-talk between the cameras. I did that because I'm thinking that the camera may not turn off as soon the power is removed and you could get some crazy things if both are trying to output video.
One thought I had:
If you decide to power both cameras together(provide power to both any time either camera is needed), this would simplify the wiring some. Is this ok? You would then be just switching the video.
btw, Mustang pictures are added to my profile album