Coolant level sensor
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2017 BMW X3, 2016 BMW X3, 2015 BMW X3, 2014 BMW X3, and 2013 BMW X3. However, it is still accessible from the selected car via links, so may be relevant.
The coolant level sensor is a capacitive sensor (no longer a reed contact). The coolant level sensor is supplied with voltage by the front electronic module (FEM) or Body Domain Controller (BDC) from terminal 15 ON (square wave signal 3.3 V).
| Item | Explanation |
|---|---|
| 1 | Expansion tank |
| 2 | Capacitive sensor |
| 3 | two-pin plug connection |
The coolant level sensor sends a signal when the coolant level is too low. The information appears in the TFT display in the form of a Check Control message. The coolant level sensor is connected to the front electronic module (FEM) or to the Body Domain Controller (BDC). The signal is transmitted to the instrument cluster on the PT-CAN.