Question about 2004 Pontiac Grand Am
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Posted on Jan 02, 2017
Although the Haynes repair manual did not have an electrical diagram for the horn circuit, I suddenly remembered I had an old CD-ROM based Auto Repair program from Popular Mechanics that has an extensive selection of diagrams. It did have a diagram for the horn circuit which showed that there was no horn relay in the circuit. So I started by taking apart the horn button on the steering wheel. The horn button is a switch consisting of two metal discs approximately two inches in diameter which are separated by a thin layer of foam which is supposed to keep the two discs separated. The metal discs have dimples that should be kept apart by the resiliency of the foam but when the foam is compacted, the dimples come together to complete the circuit. However, the foam had deteriorated to almost nothing and was allowing the two discs to be in constant contact. I solved the problem using picture hanging tape. This is a double-sided adhesive tape that is about 1/16 inch thick and comes in a roll and can be found probably anywhere hardware is sold. I cut the tape into small squares and stuck them to strategic points on the flat parts of one of the discs so that they would keep the discs apart with approximately the same resiliency as the foam. When external pressure is applied to the outer disc, the dimples come together just like before to complete the circuit and the horn works perfectly.
One thing I would like to point out is that when I initially took the horn apart, I started by removing the outer soft rubber cover from the horn pad to expose the horn button. It came off easily, but when it came time to put it back together, I could not get the cover back on. Then I discovered that there are three phillips head screws on the back side of the steering wheel that hold the horn button assembly in place. So to save time and frustration, I would recommend that step one be to remove those screws first.
Posted on Jul 21, 2008
SOURCE: horn won't stop blowing
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.
Posted on Mar 29, 2009
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Jul 14, 2017 | Hyundai Cars & Trucks
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.
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