The horns themselves work fine when I direct connect them, the fuse is fine so it may be the steering column contact. How do I get the centre piece off the steering wheel and what do I check out from there?
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Re: horn not operating
It sounds like the switch. Try turning the steering wheel and operating the horn. If it functions intermittently while turning it is could be a short in the relay control wiring circuit inside the steering wheel, pinched horn switch wire under the driver airbag module, or defective horn switch. The switch is molded into the driver airbag Cover. When the driver airbag Cover is pressed, the horn switch makes contact to ground. The ground signal is carried to the horn relay and the horn sounds. The horn switch grounds to the airbag housing. If the switch is faulty the driver airbag module must be replaced. We strongly advise professional service when dealing with the restraint system.
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What happens if you apply 12v to the contact at the steering wheel, that would test the harness?
Next is to trace that wire to the next cable plug down the harness and try again. Process of elimination that you are already on.
The problem is under the Horn push ,in the steering wheel/column. Somewhere the contact plate connection has detached, and is making a direct supply contact to the Horn feed wire, when the ignition is On...As a temporary emergency bypass, remove the power supply wire at the Horn.
Could be multiple possibilities - Horn contact in steering wheel could be bad or disconnected, the obvious fuse, or horns themselves are bad. To test horns(behind grill) run a hot lead from + side battery to horn connection
You missed something putting the column back together. IDK the design of the wheel, but if all the wires to the column are good, I'd look at the switch itself in the column. Probably not making contact.
when I had that problem it was the contacts under the steering wheel pull the steering wheel and you will see a copper ring the horn is connected to ground out that copper ring against the steering column if the horn sounds you have a worn contact I fixed mine by putting a spacer under that copper ring good luck with it
This is usually caused by a defective contact under the steering wheel for the horn button to the harness in the steering column, the contact is called a clock-srping rotoating ribbon contact, this is the most common problem.
It depends on if the relay makes a clicking sound. This will help you figure out your problem. Everything between the horn button and relay is good if it makes a solid click sound when you press the horn button. So then the problem is in the power side of the circuit. Usually the relay contacts or horn.
And then if there is no click that means the problem is on the control side. Which is the steering-column wiring or horn buttons!