The Control Display is a multifunctional display integrated in the centre of the dashboard. Control of the screen display is performed by means of a central operating control, the Controller. The Control Display uses the MOST (Media Oriented Systems Transport) bus system to communicate with all other MOST bus nodes. It is networked to the other bus systems via the System K-CAN bus. For that purpose, the Control Display acts as a gateway (interface) between the MOST and System K-CAN busses. The instrument panel is an exception. For safety reasons, it has a separate link to the System K-KAN. This ensures that in the event of failure of the MOST network, the information that is essential to vehicle safety such as the warning lamps or the vehicle's road speed can continue to be displayed.
The Control Display consists of the following components:
The Control Display has a different layout for use in the E65/E66/E67 or in the RR01:
The electronic module has two integral processors.
RR01: In contrast to the E65/E66/E67, the ”intelligent”CID Central Information Display is used. The CID Central Information Display has its own processor with connection to the K-CAN SYSTEM data bus.
Note:
The Check Control and Condition Based Service (CBS) messages are stored on the instrument cluster. The texts are transmitted to the Control Display when required.
Two cathode ray tubes built into the display casing are used for the screen backlighting. An internal temperature sensor that is in thermal contact with the cathode ray tubes enables temperature-dependent adjustment of the display brightness. There is a photoelectric cell on the LC display at the bottom right of the screen for detecting the ambient light so that the screen brightness can be adjusted accordingly.
The controller can be used to activate Service mode. Service mode provides access to details of the hardware/software versions for the control display and the control units in the MOST network, for example. Service mode provides a simple means of quickly accessing diagnostic data without the need for a diagnosis tester.
Activating Service mode:
1. With the basic menu active, press and hold down the Controller for at least 10 seconds.
2. Turn Controller three increments clockwise
3. Turn controller three increments anti-clockwise
4. Turn Controller one increment clockwise
5. Turn Controller one increment anti-clockwise
6. Turn Controller one increment clockwise
7. Press Controller down.
If the function ”MOST Devices” is selected, a list of all MOST network nodes is displayed. When a control unit is selected, a scrollable list detailing the following information appears: Item number, hardware number, coding index, diagnosis index, variant index, date of manufacture, manufacturer, message catalogue version, software version and operating system version.
The function ”Settings” provides access to the following service settings:
To exit Service mode you select the arrow symbol in the bottom left corner of the screen.
Diagnosis
E65/E66/E67: Although the Control Display (electronics unit + display casing) is one control unit, two control unit names are displayed on the testing device:
RR01: In the RR01, Control Display only consists of the electronics unit. In contrast to the E65/E66/E67, the ”intelligent” CID Central Information Display is used. This means that three control unit names are displayed at the tester:
If the aim is to test the overall system (read fault code memory, diagnosis requests, etc.), the control unit functions CD GW Control Display (Gateway), CD Control Display and CID Central Information Display must be selected.