The plastic piece mounted on the front of the headliner towards the front between the sun visors? It is about two by three inches and used to contain something such as a light...

Just bought my first Cherokee (96 Sport 4x4) and have no idea what it is. I can stick my finger in a hole on the bottom of it and feel a couple of loose wires. Im guessing it was a map light or something?

 

Remote sensor for keyless entry system.

 

might have been for the auto lock alarm feature on some XJs

 

Spy cam

 

I knew it!!

 

Sorry I had to.... It's just like getting the "jeep egg" answer when someone asks about the vac ball.

But yeah it is what is left of the remote entry thing. lol.

 

its for the aliens so they can learn about us

 

Nope, that probe is located in the center of your bottom seat cushion.