I wish I had a digital camera. The wire bundle is just behind the plastic intake piping, between the air filter box and the engine. It is probably about 1" thich. The white/yellow is in there, but it is also in a much smaller bundle that exits the larger bundle, going down towards the ground on the left side of the larger bundle, nearer the air filter. Tough to explain.
That PAC TR-7 would be an excellent piece if you wanted to integrate it into the neutral wire, rather than the hoodpin wire, as I did.
Originally posted by netZ
good info! i'm very curious to see what function the white/yellow wire is, is it possible for you to take a digital snapshot of the wire location? i have to take a look at the wrx electrical service manual again for this wire.
PAC makes a Universal Trigger device called TR-7. It can sense low voltage triggers such as the neutral wire off the ECU and output a full 12 volts.