You have to program it with a DRB (Scan tool).
the dealer does it with a 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. =(
Possible weak battery in the remote.
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.
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
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.
Try the mirror control.
Open the keyless remote and you will see the battery take it out and replace it with the same size.