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When the keyless entry system is used to lock the vehicle, a horn chirp may sound to notify the driver that the vehicle has been locked. The notification feature may be enabled or disabled through personalization. For further information refer to Keyless Entry System Description and Operation .
Check the horn relay to see if it works. Most cars use the same relays for multiple other functions. Check the part number on the horn relay and find another relay that is working that has the same part number. Swap out the horn relay with the known good relay. If that doesn't work, check all the wiring in association with the horn. If all the wiring is sound, then it is probably the horn itself, but that is very rarely the case.
REMOVE HOTWIRE HORN OR PRESS REMOTE BUTTON LOCK CAR DOORS IF YOU HEAR CAR HORN BLOWS WHEN ACTIVATE CAR ALARM. HORN WORKING.MORE LIKELY THE AIRBAG AND HORN PAD NEED REPLACING.IF YOU GOING TO FIX. DISABLE AIRBAG IN THE STEERING WHEEL BEFORE REPLACING THE AIRBAG AND HORN PAD. TURN OFF RADIO.THEN DISCONNECT NEGATIVE BATTERY CABLE FOR 20 MINUTES BEFORE REMOVING AIRBAG IN STEERING WHEEL.THAT HORN PAD WITH AIRBAG IS NOT GOING TO BE CHEAP.
In your owners manual on pages 2-19 and 2-21 tells you how to change this.
Entering Programming Mode 1. Turn the ignition key to RUN, then to OFF. This will disarm the content theft-deterrent/alarm system (if equipped). 2. Remove the RADIO fuse. This fuse is located in the main fuse block which is located on the left side of your instrument panel. The radio fuse is on the lower right-hand corner of your instrument panel. See "Fuses and Circuit Breakers" in the Index. 3. Turn the ignition key from OFF to RUN three times quickly (within five seconds). The vehicle will respond by locking the doors, unlocking the driver's door and releasing the hatch. Your transmitter is now ready to match the vehicle. Leave the ignition in RUN. 4. Press and hold the LOCK and UNLOCK buttons on the first transmitter for 15 seconds. The vehicle will respond as in Step 3. 5. Repeat Step 4 for the remaining transmitters. 6. When you have finished matching all of your transmitters, replace the RADIO fuse. 7. Check that all transmitters work by pressing the buttons.
Programmable Modes Your vehicle can be programmed to one of the following modes: Mode 1: All Off (The headlamps will not flash and the horn will not sound to provide you feedback that a lock/unlock command has been received by the remote keyless entry transmitter.) Mode 2: Horn and Lamps/Lamps (Your horn will sound briefly and your parking lamps will flash when you press LOCK on the remote keyless entry transmitter. Only your parking lamps will flash when you press UNLOCK.) Mode 3: Horn and Lamps (Your horn will sound briefly and your parking lamps will flash every time you push LOCK or UNLOCK.) Mode 4: Lamps (Your parking lamps will flash every time you press LOCK or UNLOCK.) Mode 5: Lamps/Horn and Lamps/Lamps (Your lamps will flash upon the first press on LOCK, your lamps will flash and your horn will sound upon the second press on LOCK and your lamps will flash upon any press on UNLOCK.) Vehicles are delivered programmed in Mode 5. To change the mode, do the following: 1. Press the UNLOCK button on the remote keyless entry transmitter. 2. Count the number of chimes you hear. The number of chimes tells you which mode your vehicle is set for. 3. Press the UNLOCK button, again, on the remote keyless entry transmitter until you hear the number of chimes that correspond to the mode selection you want. The mode you selected is now set. You can either exit the programming mode by following the instructions later in this section or program the next feature available on your vehicle.
When programming is complete, turn the ignition to OFF and reinstall the RADIO fuse.