My rear wiper doesnt work at all on my 1999 Jeep Grand Cherokee. I turn the control on, and still nothing. I was just wondering different areas I could check to figure out what is wrong.

Most likely it's your rear wiper motor, unless there's a short somewhere in your wiring leading to your motor. It's a little tricky to get to, to replace it, but very doable. If you don't want to replace it then you can just unplug the connecter right on the motor to make it stop.

To take the motor off you'll have to take off the rear hatch interior plastic cover, remove a few bolts inside, and then take off the wiper and arm to remove a large bolt. I have a 1999 grand cherokee and had three bad rear wiper motors with different problems. I just gave up and don't use it anymore :(

Also, if you're really bad with cars, you can just take the whole wiper and arm off until someone else can fix it :)

My first guess would be a ground problem.
The headlights and tail lights are controlled by the same headlight switch, but the brake lights are on a totally different circuit.
You may have to get a shop manual to get the wiring diagrams needed to troubleshoot the circuits if the ground connections are ok.
The lights involve the body computer and other components.

join a grand cherokee forum by googleing it and post this and all future questions there

Check your fuse:

Junction block location-1999-04 Grand Cherokee

Inside your Jeep.

remove the rear wiper arm take off the panel from the rear liftgate the wiper motor is accessible from there

with the windows it obviously is something common to all four and the first item I would check is the fuse. Interior lights are controlled by the headlight switch and a worn switch can be the problem. If these are not the problem than I would want to check the wiring, specifically the ground. Ditto for the rear wiper. Fuse first. Switch second. Wiring third.

The rear window washer should be utilizing its own switch. Clean out the spray nozzle as well.

i had the same problem and it was the turn signal/wiper switch on the steering column had burnt out the wires that control low,

there's a possibility that it might be the socket that the bulb actually goes into. my break light did something similar to that. the socket only cost about 8 bucks from the dealer.

In here you can find the information: 93ZJ-Secc-8K-Windshield-Wiper-and-Washer-Systems

And, here find the 93ZJ-Secc-8W-Wiring-Diagrams

Good luck!!!