I have an answer for you for the 1994.
Here it the process.
- Open the driver side door and keep it open.
- Manually lock the door.
- Insert your key into the ingnition and turn it to "Run" (Do not start your jeep!)
- Press and hold the Lock button on your remote for about 5 seconds. (the light should blink twice)
- You should hear the doors unlock. That is how you will know your vehicle accepted the instructions.
- You can program up to 4 (i think) remotes this way.
- To complete the process you must turn the key off and turn it back on within 20 seconds of programming the last remote.
Hope this helps, writing from memory.