How do i get my horn to stop blowing? - 2001 GMC Sierra Crew Cab

Sounds like the button under the steering wheel airbag or the clock spring iteslf is stuck.

I verify its not a stuck relay...

I disconnect connector under dash and horn stops...

I then suspect its the Horn contacts or a worn grounded wire in air bag/horn switch assembly in steering wheel.

The decorative Vinyl cover shrinks with age...presses on horn contacts against air bag.

I Disconnect Air bag connector (identified as Yellow wire and Connector) usually under dash.

WARNING: ( I Do not - I DO NoT probe the yellow harness/connector with a meter or test light. A test light WILL Detonate my air bag, and impale the bracket in a nearby object/person - me.)

I Removed screws (2) behind steering wheel - which allow air bag horn assembly to be removed.

I Disconnect Air bag connector in this location as well (identified as Yellow wire and Connector) and then;

The red (color varies) and black Horn wires will be plugged into ribbon connectors usually (2) two that feed/connect to contacts for horn function on face of air bag.

I pause here and verify horn will stop blowing when I disconnect the wires going to horn contacts. So I get horn blowing again...

Check horn: To verify this is the cause; I reconnect (whatever fuse/relay/ connector (Not the airbag connector) I disconnected so they will stop blowing) and get horn/s so they are blowing again...

Then I disconnect the ribbon connectors to verify blowing stops.

Note: The experience I had with horn on

Buick Park Ave was at night when temperature cools after hot day, the vinyl cover shrank and horn blows... pressing on horn area of steering wheel firmly would stop horn briefly - then continue.

Note: I will need a rivet tool and rivets... to reassemble.

WARNING: I Do not drill into airbag explosive container. If I do not know how to carefully drill off correct rivet heads and remove vinyl decorative cover from air bag/horn... I STOP and go to the junkyard or ebay and purchase/replace the airbag/horn assembly.

I continued by drilling out rivets (the rivets holding vinyl cover) by using a drill bit as large (or smaller) as the head of rivet and drill gently to release head from rivet body/shank.

I mark all pieces with a magic marker to verify I reassemble right side up (all metal brackets and trim plates and cover).

I Remove vinyl cover exposing horn contact pads which were sandwiched between cover and air bag container.

I used a razor blade to remove vinyl honeycomb material from area of vinyl cover - that when pressed - would activate horn/contacts.

Only a 1/16 of an inch or less needs to be removed.

(I Bend cover inside out and shave material off of area slowly. Care not to cut myself.)

I Reassemble in reverse order with rivets.

Check horn: ...function at this point... by plugging in horn connectors and assure horn contacts work properly as expected.

Take horn relay out and look for corrosion on prongs.

• The horn relay might have welded contacts (stuck in the on position). Pulling the relay should stop the horn.
  
• The wiring harness on the steering column might have a broken wire to the horn relay shorting to someplace that applies power to the relay. In this case, turning the steering wheel all the way to one side or the other may stop the horn, and it won't sound when you press the horn button.
• The horn button in the steering wheel is stuck on or shorted.

could have stuck horn switch in steering wheel..or maybe the horn has internal short.

wiggle the horn on the colum if it stops then the spring on the horn pad has gone bad

When you press on the horn button do you hear the horn relay click? The start at the horn, bench test it, if it works then check for power, is the fuse good and is the relay ok. If the stuff checks out then it may be the horn contacts behind the steering wheel.

Very possibly the horn relay. This is located in the left junction block ( fuse panel) on the left side of dash. Open driver door and you will see a panel cover on the end of dash. On the cover it should list the position of the relay which I believe is on the right of fuse panel. If you try the horn and it sticks on again, try tapping the relay, if stops then that is the problem.

If you can locate and pull relay, do that, if not, pull wires off at horn if you can, otherwise pull fuse. If you have other relays same in area of horn relay (same number on relay) try one of them in that horn spot to see if maybe it's just a stuck relay.If you pull fuse for horn, you may find out something else on same fuse, so make sure you check everything else is working.

Ford horns are famous for this disconnect the black ground wire from the horn front of vehicle next to radiator. This will stop it for noe you will need to replace the horn all the parts houses have them. Good Luck