BMW X3 Owners Manual: Indicator lamp on the interior rearview mirror

• The indicator lamp flashes briefly every 2 seconds: The system is armed.
• The indicator lamp flashes after locking: The doors, hood or tailgate is not closed properly, but the rest of the vehicle is secured.

  After 10 seconds, the indicator lamp flashes continuously. Interior motion sensor and tilt alarm sensor are not active.

  When the still open access is closed, interior motion sensor and tilt alarm sensor will be switched on.

• The indicator lamp goes out after unlocking: The vehicle has not been tampered with.
• The indicator lamp flashes after unlocking until the engine ignition is switched on, but no longer than approx. 5 minutes: An alarm has been triggered.

Interior motion sensor

The windows and glass sunroof must be closed for the system to function properly.