I'm hooking up a HU which requires I tap a light green wire into the "power supply side" of the parking brake switch. Laying on my back looking up at the parking brake mechanism, I can see a single green/yellow wire coming out of the a plunger/switch. The plunger is on the passenger side of the parking brake. Is this the correct wire I need to tap into? The diagram that came with my HU shows the brake switch with one wire running into the switch from the power supply side and another running to ground. I can only see one wire, but it is very tight under there and can't be too sure. I don't know if the year is important, but my Tacoma is a 2012. I've had it for two weeks and the interior has been torn out for one. A full sound deading / sound system upgrade is underway and if I don't get it back together soon, my wife is going to kill me.
Incidentally, I've read about several ways to bipass the parking brake, but my HU is apparently quite difficult to defeat. It is a Pioneer AVH-4400BH and even if you use a relay (as I am) you still need to tap into the parking break wire.