False alarm
| False alarm | 
| • | Knocks to the car | |
| • | Shaking or vibration of the car | |
| • | Wind load (external pressure waves) | |
| • | Automatic switching on/off of any electrical equipment in the car. | |
| • | External noise | |
| • | Changes in the internal/external light intensity | |
| • | Air flows and turbulence inside the car. | |
| • | Temperature changes inside the car. | |
| • | Fan noise from original extra heaters inside the car. | |
| Important | ||
| This assumes that all doors/hatches and windows to the passenger compartment are closed. | ||

 
     
		