Identify This Plug(USDM ST) Options

[Coomer]

So I've got this extra plug from my modified harness sitting in my engine bay, and I'm curious as to what it's for. Here's the plug:







Now, my car is five-speed '94 USDM Celica ST. The car had A/C from the factory. Any ideas as to what this plug is for?

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[lagos]

i remember seeing that plug before, but i cant remember where they hell it goes. my guess is some type of sensor, since its a single wire plug.

what are you doing with your harness? i see you are using crip connectors...thats a BIG no no when dealing with the harness. you want to solder every connection and use shrink wrap. those crimp connectors just come loose over time.

[Coomer]

what are you doing with your harness? i see you are using crip connectors...thats a BIG no no when dealing with the harness. you want to solder every connection and use shrink wrap.  those crimp connectors just come loose over time.
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Those crimp connectors are the work of my mechanic. Trust me, I'd never do it that way if I did it. They're one of the reasons why I'm tearing apart the entire harness and re-wiring stuff using soldered connections. The harness currently has no problems, but I want a better looking engine bay and peace of mind knowing it's all soldered.

I'm also relocating the diagnostics connector over to the other side of the car, moving wires from the firewall to the main harness, removing un-necessary wires from the main harness, wiring up the engine's stock injector wiring loom, tucking the wires under part of the throttle body, etc. When I'm done the engine bay will look way better, but man is it a lot of work. So far I've got about 12 hours of work into it and I'm just now starting wiring stuff back up. I just came in from wiring up the AFM and TPS.