DME or DDE: Digital Motor Electronics Or Digital Diesel Electronics
WARNING: This page is about a different car, the 2005 BMW 645Ci and 2004 BMW 645Ci. However, it is still accessible from the selected car via links, so may be relevant.
The head-up display receives signals from the DME or DDE regarding the cruise-control system or active cruise control. The signals are transmitted via the PT-CAN and K-CAN.