Brightness Control
There is a photo-cell on the front of the LCD to the right of the screen for detecting the ambient light so that the screen brightness can be adjusted accordingly.
The screen brightness also responds to manual adjustment of the instrument lighting dimmer control.
The Control Display communicates via the MOST bus system with all other components on the MOST bus.
The Control Display is the system master for the MOST bus. The system master holds the knowledge of the complete system and links up the individual modules into a system.
The Control Display also performs the function of power master within the MOST network.
That means that the Control Display wakes up all MOST nodes (control units). They then register with the Audio System Controller (= connection master, control function for establishing connection).
Once all nodes (MOST control units) have registered as awake, a message to that effect is sent to the Control Display by the ASK.
The Control Display is also responsible for sending the MOST nodes to sleep. The MOST bus is networked to the remaining bus systems via the K-CAN SYSTEM.
The Control Display contains the gateway module, MOST-CAN Gateway (MCGW) to function as an interface between the MOST and K-CAN-S busses.
The instrument cluster is an exception. It has a separate connection to the K-CAN S.
The Controller is connected by the K-CAN S via the Center Console Control Center module (BZM) to the Control Display.
The diagnosis interface for the Control Display is the ZGM via the diagnosis bus.