"Wake-up" Lead In PTCAN Network
WARNING: This page does not describe the selected car, but rather 59 other vehicles, including the 2009 BMW M5, 2009 BMW 650i, 2009 BMW 550i, 2008 BMW M5, and 2008 BMW 760Li. However, it is still accessible from the selected car via links, so may be relevant.
The PT CAN for the E65 is now a three wire CAN, the third wire is a hard wire KL-15 signal used to wake up the powertrain control units. The "wake-up" lead has nothing to do with the actual PT CAN function. A wake-up telegram is still transmitted by the CAS via the ZGM - PT-CAN as a CAN message.