Better start pulling connectors apart and checking grounds with your meter to determine if you're even getting power to these devices.
I'm not a fan of electrical, but it's generally something simple like a bad relay, a bad fuse, or a short in the wiring. Finding it is not the simple part.
For the record, you do not drive a FSJ. That would be a Wagoneer or Cherokee Chief from the 70's thru early 90's. You drive an XJ assuming you're driving the "regular" or "little" cherokee.
'00 XJ - Somewhat modified
'01 Venture - high mileage, paid for, shut it