Then it is important to carefully examine all other cables and hoses for damage, including electrical wires for the horn. Rodent Damage: If bite marks or the like are discovered, there is a high probability that a rodent has let off steam in the engine compartment of your Jetta. If it shows 0 volts, it means the horn is not getting any current. Multimeter should show 12+ volts at the connector when you press the horn button on the steering wheel of your Jetta. The multimeter should read 12+ volts, if it reads 0 volts then it indicates conductivity failure in the horn system: a broken wire, bad connector, broken clock spring or faulty switch can be the cause other than blown fuse or bad relay. After inserting the probes, ask a friend to press the horn button in the vehicle. Turn on the multimeter and insert the probes into the connector, one at each point making sure the metal part of probes don’t touch each other – otherwise it will short out and blow up the fuse, and may cause damage to the vehicle’s electrical system. If you don’t see any corrosion on the connector of your Jetta, then its time to perform the voltage test with a multimeter, or you can also use a test light. Remember: The battery should be reconnected after replacing the relay – otherwise no current will flow. Be careful not to damage anything when removing the relays. Most relays are plugged in, but they can still be relatively tight. With this you can easily test whether the electromagnetic switch is actually the cause of the malfunctioning horn on your Jetta. Before starting the replacement, you must always disconnect the vehicle’s battery.Īs soon as you have identified the relay for the horn, you should check whether there is an identical relay in the box, typically you can use AC relay to test the horn relay. If you are lucky, the wiring diagram will be drawn on the facing. Typically relays are located in the engine compartment or under the steering wheel on the left-hand side. The information may be listed in your vehicle’s owners manual. A horn relay is rectangular or square shaped with 3 or more legs at the bottom.įirst of all, you should find out where the horn relay is located in your particular model of Jetta. A bad relay can also be the cause of horn failure on your VW Jetta.
Relays are electromagnetic switches that are used to switch electrical loads on and off.
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