PDC button
WARNING: This page is about a different car, the 2013 BMW X5, 2012 BMW X5, and 2011 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.
The PDC button is used to manually activate and deactivate not only the parking aid (PDC: Park Distance Control) but also the back-up camera (forced connection optional extra 3AG "back-up camera" with optional extra 508 "Park Distance Control (PDC)"). The IHKA control module reads in the status of the button. The IHKA control module sends the status as a message on the K-CAN. The message is received by the control module of the back-up camera.