I am trying to find out how to do the reprogramming, but haven't found out how, but did find out that from 1999- 2004 the door lock fobs are interchangeable. You may need to take to Jeep dealer to actually get it programmed, but at least you won't have to buy a new fob.
the dealer does it with a scan tool
You have to program it with a DRB (Scan tool).
I had the same problem. Google "keyless entry remote 2003 Jeep Grand Cherokee".
dealer has to do it with factory scan tool
it has to be done by the dealer. =(
I had to replace a keyless remote for my 2001 dakota. I found one off od E-bay then I had to program it using the programing sequence in the owners manual. It was really simple. I only paid something like ten buck for the remote and have had no problems.
Possible weak battery in the remote.
centre top dashboard (red dome)
how do you program a keyless entry remote to a 2000 Pontiac grandprix programyourremote.com (program your remote.com)
go to http://www.programyourremote.com/ they have programs for many makes and models
Try the mirror control.
The keyless entry system must be programmed with an OBD II tool which the dealer or locksmith has. Sorry that this is not the answer your looking for, I didn't want to hear it either.