Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Horn System
Horn system components include underhood junction block HORN (15-amp) fuse, horn relay, horn slip ring, steering wheel mounted horn switch, horn assembly and body control module.
Horn system is activated depressing horn switch, or BCM. BCM commands horns on under following conditions:
- When panic button is depressed on remote control door lock transmitter.
- When keyless entry system is used to lock vehicle, a horn chirp may sound to notify driver that vehicle has been locked. Notification feature may be enabled or disabled through personalization feature.
Battery voltage is applied at all times to horn relay coil and horn relay switch circuits of horn relay. Pressing horn switch applies ground to horn relay control circuit. BCM may also apply ground to horn relay control circuit as described above. When horn relay control circuit is grounded, horn relay is energized and battery voltage is applied to horns through horn control circuit. Horn sounds as long as ground is applied to horn relay control circuit.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.