I am having the same issue with my 99. Went to the store and hit the fob to lock it and Hhhhooooooooorrrrrrrrnnnnnnn! Disconnected the battery and did the shopping, came out reconnected and nothing.... Drove home locked the door waited for a few minutes and nothing. 20 minutes later, hhhhhoooooooooorrrrrrnnnn. I replaced the terminal connectors thinking it may be some sort of ground issue, reconnected the battery, waited for a minute nothing, started the Jeep and another couple of minutes later, horn blows again with the jeep running. I disconnected it and walked away. Two days later I'm here looking for help.