False alarm
| False alarm | 
| • | Knocks to the car. | |
| • | Vibration of the car. | |
| • | Wind load (external pressure waves) | |
| • | Automatic switching on and off of other electrical equipment in the car. | |
| • | External noise. | |
| • | Changes in the internal/external light intensity   | |
| • | Air flow and turbulence in the car. | |
| • | Temperature changes inside the car. | |
| • | Fan noise from original/extra heaters inside the car. | |
| • | Noise transferred from outside through the body to the inside of the car (e.g. rain and hail). 
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