I'm swapping all of the engine and dash wiring from one XJ to another (MJ), the donor wiring is a 93. I took the harnesses completely and didn't cut or hack anything, I just ended up with a few extra plugs after reinstalling.

Plug #1 comes through the firewall in the small pigtail that goes in behind the intake manifold, to the left of the brake booster.

Plug #2 is under the steering column, near the other big plugs for the steering column

Plug #3 is up near the fuse panel

Plug #4 comes out right next to plug #1. Also these were originally clipped to something, which I can't seem to remember

 

Flat one looks like it goes to the steering column, the last one stays unplugged, and I'm pretty sure the other 2 stay unplugged as well but someone else will chime in

 

Look around on the steering column, there is probably a spot for it

 

Thanks, I'll look on the column some more.

 

Picture #3. If this is located on the driver side footwell, behind the hood release, then it is for the interior footwell light. Test with 12volt bulb or meter.
In the same area I have an unplugged connection which is for the dash speakers. It has 4 wires to the connection, but the connection itself has only 2 contacts.

 

Don't think the XJ I pulled had the footwell lighting, and the speaker wiring is way off because the XJ didn't have dash speakers, and the MJ doesn't have front door speakers. So it is possible they'll just be unused.

 

My 1996 also did not come with footwell lights or dash speakers. But the harnesses are still there.

 

Got some better pictures of the main missing plug. Looked all over the column and found nothing

 

And a better shot of the two on the trans tunnel