what is this plug for?

[cjrob]

so jacked up the car last week to inspect the front suspension, I found this plug dangling from the bottom of the bumper, it was routed along the bottom of the radiator and I have no idea what its for.

it seems to be just an electrical loop, the end of it is actually broken but the car runs fine.

its a 2000 450, have a feeling its Air Con related, I have never checked to see if the Air Con is working, tend to drive 99% of the time with the roof down so never needed to.