THE WHOLE HORN PAD AND AIRBAG IN STEERING WHEEL HAS TO BE REPLACED.BECAUSE HORN PAD BUILT IN THE AIRBAG.IF YOU GOING TO REPLACE AIRBAG IN STEERING WHEEL YOUR SELF. DISARM AIRBAGS BY FIRST TURNING OFF RADIO,THEN REMOVE NEGATIVE BATTERY CABLE,WAIT 20 MINUTES FOR AIRBAGS DISCHARGE.BEFORE REMOVING THE AIRBAG HORN PAD.
SOURCE: horn wont blow
the problem is the rotating contact that connects the horn to the steering column wiring harness, this part is called the clock-spring contact, u must remove the steering wheel to change the part out.
SOURCE: Changing a headlight on a 2004 GMC Envoy
If it's the same as a Trailblazer you have to first remove the "bowtie" from the front between the two light bezels. Gentle pull forward and the pressure clips will release. Don't be shy. There are no screws. Than with the light bezels exposed you will see a metal clip that has to be pulled back to release the bezel and it will swing forward to allow you access to the bulb.
SOURCE: My 2002 Nissan Pathfinder's car horn for the alarm stop working.
Just hold the lock and unlock button on your key until you hear the horn again. Then its activated :)
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