Why does the 09 Highlander's alarm horn sound for no reason?

[AmirRose]

The reasons why the 09 Highlander's anti-theft alarm horn sounds for no reason are as follows: 1. High sensitivity of the anti-theft device: If the car alarm sounds for no reason, it is most likely because the sensitivity of the anti-theft device is too high, causing the alarm to sound even with slight vibrations. To resolve this, first locate the main unit of the anti-theft device, which is usually under the steering wheel or inside the A-pillar trim. Then, slightly adjust the sensitivity knob, but avoid setting it too low, as this would significantly reduce the car's anti-theft effectiveness. 2. Faulty wiring of the anti-theft device: It could also be due to issues with the wiring of the anti-theft device's main unit, which requires timely inspection, repair, or replacement. Precautions regarding the anti-theft alarm: Whether checking the wiring or replacing the alarm, it is best to leave it to professionals. Improper installation or reversed wiring could render the anti-theft device unusable at best or, at worst, damage the car's internal components.