CAS: Car Access System
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 CAS is connected across the K-CAN2 with the footwell module (FRM) and the junction box electronics (JBE). The CAS performs the convenience functions for the power window regulators. All signals to control the power window regulators are sent as a message from the CAS on the data bus.