Bought a `96 Cherokee last friday, pretty happy with it so far (ti doesn't even have the standard 4.0 oil leak) . But I'm wondering what this is: Screwed to the headliner between the front visors is a 3" x 7" gray plastic piece with a 1" diameter black plastic dome hanging down from the middle. It doesn't light up, it doesn't turn, it doesn't do anything that I can see. Whatizzit? Could it be part of a now-defunct alarm system (siren and LED are in place, but I've no way to arm or disarm the thing)?
And: This Cherokee came in the Sport trim package, I'l like to have the lensed overhead map lights like in my `89 Cherokee Pioneer. Can I just pull a map light fixture in the local bone yard and plunk it in?