Just some xj questions

[BiggDaddy]

Maybe JFiscus or anyone can help. I am just curious really.

I took off my front bumper to put on factory tow hooks. Found two things that caught my eye. First was an electrical connection right in the middle of the bumper. I don't have anything hooked up to it. I have two thoughts a) a sensor for daytime running lights or something, and b) an airbag sensor. I have a driver side airbag for sure, but I don't know if it is hooked up or where the sensor is for that thing.
Secondly, there is a big round ball on the passenger side right behind the front bumper. It had what looks like a vacuum line running to it, but that's it. I am totally lost for this thing.

I hooked the ball back up, but like I said the electrical connection was just there, nothing coming from it. The tow hooks went in ok. After I traded some bolts in for non-torx heads. They don't look too bad either, aside from the part where you can't really even tell they are there, but that's not a bad thing either. I got a little worried doing just mild wheeling without any tow points at all. Guess it's always good to be safe. It's a daily driver, so I don't do much anyways. Oh well, I'm getting long-winded. Thanks for any ideas on this stuff.

BiggDaddy