What is that module on the roof of my BMW 525i (E39)?
As far as I can tell, it doesn't appear to have any function. Does anyone know what it is?
- champerLv 73 months agoFavorite Answer
It's actually the alarm system motion sensor.
- River EuphratesLv 73 months ago
It's the d-bag sensor.
If it doesn't sense a d-bag in the driver's seat, it won't allow the car to be put into gear.
- Anonymous3 months ago
Time to check the owner's manual. Could be a cabin temp sensor.
- Robert JLv 73 months ago
It could be a temperature sensor for climate control, ultrasonic sensor for the security system, a microphone for either hands-free or automatic volume control on the audio system, or even an air quality sensor...
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- BillLv 73 months ago
The smoke alarm.