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Short in wiring or horn. Disconnect horn from vehicle wiring. I would run a wire from the positive (+) side of battery and touch to the terminal the horn (careful not to touch the bare wire to the car or horn body). If horn sounds, you have the joy of finding a short. They make a tool for that. If the horn doesn't sound off, you need a new one.
What is the problem with the horn. Check Fuse for Horn. Check Horn it is located under the bonnet. Near the front grill of the car. Check relay for horn most likely also located somewhere in engine compartment in a plastic box compartment with numerous relays. If horn not sounding should hear relay click when horn button pressed.
If horn is getting voltage at horn plug (positively switched horn design) then horn may need replacing.If negatively switched then horn connects to body of car when button pressed and other side of circuit has Plus 12 volts always on it.
Besides the switch on the steering wheel being pushed to control the horns , the BCM - body control module can activate the horns as well .
The horn system consists of the following components:
• HORN fuse
• Horn relay
• Horn slip ring
• Horn switch
• Horn assembly
• Body Control Module (BCM)
The vehicle horn system is activated under the following conditions:
• The horn switch is depressed.
• The body control module (BCM) commands the horns on. The BCM commands the horns on under any of the following conditions:
- When the panic button is depressed on the remote control door lock transmitter. For further information refer to Keyless Entry System Description and Operation .
- When the keyless entry system is used to lock the vehicle, a horn chirp may sound to notify the driver that the vehicle has been locked. The notification feature may be enabled or disabled through personalization. For further information refer to Keyless Entry System Description and Operation .
Battery positive voltage is applied at all times to the horn relay coil and the horn relay switch. Pressing the horn switch applies ground to the horn relay control circuit. The body control module (BCM) may also apply ground to the horn relay control circuit as described above. When the horn relay control circuit is grounded, the horn relay is energized and battery positive voltage is applied to the horns through the horn control circuit. The horns sound as long as ground is applied to the horn relay control circuit
The BCM is receiving an erroneous signal from somewhere , keyless entry maybe. Hooking up a professional type scan tool to view inputs to the BCM would be the first diagnostic step I would do at the dealer .
no need to take of the steering wheel.. locate the old horn.. then remove it.then put the new horn. if the old horn has only1 wire its ok. then the new horn has 2 wire. just body ground the 1 wire[no polarity] choose any of the 2. to the body gound or join the brack of the horn together.then the other to the original wire of the old horn
The clicking is the coil side of the horn relay....That pulls in the contact which carries the heavier currant needed for the horn operation.
To work on this fault you'll need an electrical test meter or light....
Locate the actual relay by having someone press the horn and NOT hold it down
The clicking will lead you to its position.
Unhook it from its bracket and with the meter check that the switching side of the relay is closing when the horn is pressed.
If not replace the relay.
If power is going across the switching side go to the connection on the horn at the front of the vehicle and check the power output there
If you have power there, check to make sure the earth contact to the body is intact.
The earth contact is usually through the horn button via a contactor on the steering wheel assembly.
I would think that that is fine as the relay is operating.
if all power is coming from the relay and the horn is grounded correctly, replace the actual horn.
Find the horn(s). They are usually on the front of the radiator support mounted down low so lots of salt, water and dirt can get in them. Remove them. Hook them up to the battery with a couple of jumper wires. One wire should go from the positive battery post to the small insulated terminal on the horn. The other wire needs to go from the horn body to the negative battery post. If the horn works at all it will beep when the wire is hooked up, If it doesn't, replace the horn. You can get new ones from an auto parts store or used ones from a junkyard.
Every horn needs two things...positive power and ground. You will need to verify what your old horn wiring does, as an example...the horn may be grounded to the body, and positive voltage flows through the wire to the horn when the horn button on the steering wheel is pressed. The other way is to have a positive at the horn, and the ground is given to the horn with the button pressed.
This is best verified with a volt meter or test light.
Your new horns may have on wire plug, it would be for the positive, as it gets ground from being bolted to the body.
You can realistically place the new horns anywhere, as you might have to extend your wiring to reach.