![]() The diagrams also include helpful tips for troubleshooting any problems that may arise during installation. This makes it easy for anyone to set up the system correctly and safely. The diagrams provide detailed information about how to connect and mount the various components of the stereo system, including speakers, amplifiers, wiring harnesses, and more. Whether you're looking to upgrade your existing sound system or invest in a new one, the diagrams can help you get the most out of your car's audio system. But in rare cases, it is possible that only horn wire in the spiral gets damaged.Automotive enthusiasts rejoice! 2018 GMC Sierra Stereo Wiring Diagrams are now available for download, allowing you to easily install and upgrade your truck's audio system. ![]() For example, the airbag warning light may illuminate in the instrument cluster, or other buttons on the steering wheel may stop working. If the clockspring is damaged in your Sierra 1500, you may see other system malfunctions as well. ![]() The clockspring contains delicate wires that can get damaged during servicing or due to overuse if the vehicle has put on too many miles. The clockspring is located between the steering wheel and the steering column. The spiral cable or clockspring is a spiral-wound special rotary electrical connector in your GMC Sierra 1500 which allows the steering wheel to turn while still making an electrical connection between the buttons on the steering wheel, including horn button, and the vehicle’s electrical systems. 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 Sierra 1500. 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 Sierra 1500. 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 Sierra 1500, then its time to perform the voltage test with a multimeter, or you can also use a test light. For safety reasons, make sure the battery is disconnected when cleaning the connector, and the connector is fully dry before you plug it back in. You don’t necessarily have to replace the corroded connector, in most cases the connector can be cleaned with WD-40. This can lead to corrosion on the connector resulting in poor conductivity. The horn sits at the front of your GMC Sierra 1500 where grime and other small particles can build up over time. 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 Sierra 1500. 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 Sierra 1500. A bad relay can also be the cause of horn failure on your GMC Sierra 1500. Relays are electromagnetic switches that are used to switch electrical loads on and off.
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