I have a 94 jeep that wont start with the key could you help me .

does it click or turn over or the engine wont rotate ? I need more info on your problem but am very willing to help. also tell me some information as to what engine is in it, the mileage and do the headlights go dim or out or stay bright when you try to start it? Have someone watch them for you when you try to start it. Let me know. I need to know these things to give you a decent diagnosis as there are many possibilities for an answer.

It could be the security system or maybe a crank sensor.

Make sure all your grounds are clean and secure. I'm sending a wiring diagram to you...different year but more accurate than anything you will see in haynes etc. http://www.scribd.com/doc/18999822/Jeep-Wiring-2
take a look at it and perhaps you can get it figured out!
good luck

i would suggest checking to see if you are getting fuel by disconnecting the fuel line at the fuel rail and turn key if no fuel then its either fuel pump or fuel filter. if you get fuel then it would be the spark

Well My 94 Jeep Grand Cherokee had the same problem and we had to just cut into the lift gate panel from the inside. It required cutting plastic but with a 94 looks arent everything and a working lift gate was worth it. But then we pealed back this black plastic mat under the panel and lifted up on the release bar(verticle bar that lifts the latch) and once we got it open we adjusted a little clamp that had slipped. Dont adjust it too much or when u lock it it wont lock! But sorry i dont know the name of the parts. But then u can screw the panel back in and it wont look to bad besides some cuts.

If you have a security system, close all the doors and then lock the drivers door with the key, then unlock it. That should re-set the system. I've had the computer completely disconnected from mine several times (used it to check another vehicle) and I don't have security...it started and ran fine...only difference between the two is the security so I'd try that.

no it wont work.they made too many changes with them about 2 years older and id say yes but no they wont interchange

Find and pull the fuse. Even aftermarket units have a fuse somewhere.You will need a new battery after you find the problem as starting batteries do not tolerate going flat too many times. They are not designed for it.

have you tried manually unlocking the hatch to reset the security
system?? My 94 grand cherokee limited did not have a key pad to turn system on/off...i have reset it by turning the key in the rear hatch lock to the left twice...see if this works. - SmokeWrench

use the driver door lock with the key or the rear door. Put the key in them and unlock them..Both doors have a alarm shut down. Give that a try and let me know........