My horn used to honk when I locked my 1999 Jeep with the remote

Adjust the user interface to honk on the dash display.

If your vehicle is equipped with a factory keyless entry system and you have the owner's manual, there should be a section in the manual describing how to change your options with your system. But if you have an aftermarket system, which I am thinking this the case, you will have to manually go into your dash under your steering wheel and cut the wire going to your horn from the security system. Once you have accessed your wiring underneath your steering wheel, there is a main harness with a bunch of wires going to the steering wheel. In this harness you will find a DARK GREEN/VIOLET small gauge wire and you should see another wire tapping into it probably coming from the security module. Just cut it off but leave the DARK GREEN/VIOLET untouched and this will eliminate the horn honks.

TThere is probably a problem with the door unlock relay or the passenger door module. The passenger door modules on Jeep Cherokee have had a lot of problems and there are a couple of Technical Service bulletins published by the manufacturer as a result of these failures.

I have never had to do this but I am told this is the correct proceedure.

Keyless entry key pad procedure
1. Turn the ignition to the 1 (OFF/LOCK) position.
2. Close all the doors.
3. Enter 5-digit entry code
4. Press and hold the 7 • 8. While holding the 7 • 8 press the 3 • 4.
5. Release the 3 • 4.
6. Release the 7 • 8.
The user should receive a horn chirp to indicate the system has been
disabled or a chirp followed by a honk to indicate the system has been
enabled.

look online or go to the dealer and find a reprogramming procedure.

Before replacing any Relay. Try disconnecting the negative side of the battery for at least 2-minutes to de-energize the security system, re-setting itself. The reconnect the battery and try your security (and options) system again.
The only other big question that you will have to know: is this a factory installed security system or an aftermarket security system? This makes a difference in security systems, relays etc.

Your lock settings were most probably changed from your remote unit. By pressing both lock and unlock keys together for around two to three seconds you can switch between silent mode and horn mode. Hooe that helps...

Look in your manuel, there are steps to change the Key less remote setting to customize it the way you'ld like the car Key less system to work.
Good luck and hope this helps, if your still having problem. Just drive the Dodge dealer and ask the Service adviser to help you out, he or she would be more then happy to reprogram the key less system for you.

SECTION 501-14B: Keyless Entry/Computer Operated Locks 1999 Town Car Workshop Manual GENERAL PROCEDURES Programming —Keyless Entry Keypad Code

1. Enter the permanent factory keyless entry keypad code.

1. Press the 1/2 button within five seconds to activate the programming mode. Holding the 1/2 button for more than two seconds will erase all stored customer codes. The existing codes do not need to be erased to program new codes.

1. Enter the new five-digit keyless entry keypad code.

1. To associate the new code with personality positions 1, 2 or 3, press the 1/2 button within 5 seconds of entering the 5th digit of the new code for position 1 or 3/4 button for position 2 or 5/6 for position 3. The door locks will lock and unlock confirming the new code is programmed.

1. If another code is to be programmed, begin entering the code within 5 seconds of the last button pressed.

1. After all new keyless entry codes are programmed:
   • Press keyless entry keypad buttons 7/8 and 9/0 at the same time to exit the program mode.
   • Wait for 5 seconds; the driver door module (DDM) will exit the program mode automatically.
   • -------------------------------------------------------------

Programming —Transmitter

1. Cycle the ignition from OFF to RUN four times within three seconds. The locks will then lock and unlock, confirming program mode has been entered.

1. NOTE: When the first keyless entry remote transmitter is programmed, all other keyless entry remote transmitters are erased.
   Press any button on the transmitter to be programmed.

1. If additional keyless entry remote transmitters are to be programmed, repeat step 2 within 7.5 seconds.

1. To exit program mode, turn the ignition to START or wait 7.5 seconds.

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Programming —Remote Memory Activation NOTE: This procedure must be completed within 5 seconds.

1. Press the SET button on the driver door panel.

1. Press any button on the keyless entry remote transmitter to be associated with a memory setting.

1. Press the 1 or 2 memory button on the driver door panel.

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Programming —Autolock and Horn Chirp

1. NOTE: This procedure must be completed within 30 seconds.
   Turn the ignition switch to RUN.

1. Press the UNLOCK button three times.

1. Turn the ignition switch to OFF.

1. Press the UNLOCK button three times.

1. Turn the ignition switch to RUN. The doors will lock and unlock to confirm entry into program mode.

1. Press the UNLOCK button once to toggle the Autolock feature on or off, or twice to toggle the Horn Chirp function on or off. The horn will chirp to confirm toggling of the Autolock feature.

1. Exit program mode by turning the ignition to OFF, START, or wait 7.5 seconds.

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If you look in the jeeps owners manual for the keyless remote section, you can program the horn to honk or not honk when you lock the doors.