What causes the alarm to suddenly sound and hazard lights to flash when the car is parked?

[DeRyan]

The reasons why the alarm suddenly sounds and hazard lights flash when the car is parked: 1. The sensitivity of the anti-theft device is too high; 2. The hazard light power switch is loose, and the distance between the switch and the contact point is close. If the switch is loose, when the car is subjected to vibration, it will cause the switch to touch, thereby connecting the circuit; 3. The control box is malfunctioning. Solutions: 1. Locate the anti-theft device host under the steering wheel and the rain shield under the A-pillar, then adjust the sensitivity button; 2. Replace the hazard light power switch; 3. Check whether the relay is functioning properly. Use a multimeter to test the output line of the hazard light relay to see if the output voltage is 12V. If there is no voltage output or the output voltage remains at 12V, it indicates a relay failure, which must be replaced.