Waking of the MOST via the K-CAN for a automatics service
WARNING: This page does not describe the selected car, but rather 21 other vehicles, including the 2006 BMW Z4, 2006 BMW M3, 2006 BMW M Roadster, 2006 BMW M Coupe, and 2006 BMW 550i. However, it is still accessible from the selected car via links, so may be relevant.
The telephone control unit wakes up cyclically in order to check for receipt of a new request from the automatics (e.g. an SMS text message to switch on the auxiliary heating).
The MOST network is a closed ring only. For it to work, all bus participants in the MOST network must be "awake".
As a MOST participant, the telephone control unit is unable to wake the MOST.
When it receives the trigger signal from the telephone control unit, the CAS wakes the multi-audio system controller (M-ASK) via the K-CAN. The M-ASK then wakes the MOST. Only now can the telephone control unit check whether a automatics service needs to be executed.