Do me a favour - connect a test lamp to it and turn on your hazard lights. I'm betting it's the indicator plug that's pre-wired for a bullbar.
It isn't the ambient temp sensor, Thai models don't include it in the loom and it's a 4-pin thing anyway.
If it's not bullbar indicators (which were pre-wired on mine, and I assumed similar for the Thai builds) then it must be fog lights. A change in indicator stalk is required - either a new stalk with the fog light option, or using the mod described by Malicious in this thread. The output is controlled by the BCM (body control module) so you won't see them activate until the stalk is changed.
You could probably test that by identifying the fog light relay and activating that circuit manually (which involves removing the relay and manually switching its output with a switch capable of handling 20A).
Why would they be two completely different plugs? I will investigate more after work.
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