this is taken from the Headunit install sticky above
1'st there is no SWITCHED (red) at the adapter on unamplified systems.
Amped systems should have switched power on the third to last pin on the
bottom right of the factory ribbon plug. (A 3) - or the intent is to feed 12v down
this wire to power the rear amplifier harness - donno and dont have an amp'd car.
There is also a 12v switched in the rear harness (behind driver rear seat) Pink.
No power for me there either so you see why I can not verify this pinout.
Same power issue I had installin' my Amp. The (most convient) Lighter at the front
console is DOA on my rig (as purchased) No 12v on the wire at all so I had to tap into
the rear lighter again.... Brother....
Pull switched power from an accessory circuit (lighter)
but you must swap fuse positions for the circuit to die with
the ign (other option is always on) for the accessory circuits.