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Try connecting power directly to the horn and see if it goes off. If not, it would seem it needs replacing. If it works, maybe the horn switch on your steering wheel is broken. A simple process of elimination.
remove grill ck horns with jumper wires ck plug for power, if horns work .if horns dont work with jumpers replace . if no power ck fuse if good relay for signal and power if no signal when horn pushed either horn switch in airbag ,or cable reel witch need cked with special srs tools .
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.
Press panic button on the remote to check if horn is broken or if the switch in the steering wheel does not work.
Also check fuse for steering wheel module.
if you take a test light and test all the fuses in the fuse box and if they are good then when pushing on the horn button you can usually hear the horn relay working(click).if it does then you need to check the horn itself.take a wire and run it from the battery positive cable and connect it to were the horn wire connects to the horn,it should blow(make sure of a good connection),if it does then it could be a dirty connection at the horn.if it doesn`t blow then the horn needs replacing.you can also use the test light and test for power at the horn wire at the horn itself to see if the horn is being feed power from the horn button to the horn.
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.
Knowing the MY (model/year) tells me the horn is the problem. Yet, there is a Horn Relay and a fuse which feeds it power. A simple test with a 12 volt light bulb can verify/eliminate this as the cause. Connect a bulb (12 volt) to the connector contacts which plug into the horn. Then activate the horn (press on the steering wheel airbag) to see if the bulb lights up. If it does, then it's the horn. If it doesn't (make sure the bulb and connections are good), then the problem is in the wiring/relay/fuse.
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