Hi Richard, reading the info on the wiring diagrams it does say the CID is controlled via the K-Bus.
Automatic positioning: The Central Information Display (CID) is folded up or down automatically when a function of the Central Information Display (CID radio) is activated. The activation is triggered at the Central Information Display radio (CID radio) via the right-hand rotary pushbutton (DDK) ”Navigation ON/OFF” or the left-hand rotary pushbutton (DDK) ”Radio ON/OFF”. Exchange of information takes place with data telegrams via the K bus.
For the LC display, the following positions are defined:
0 degree position: Resting position; the display is folded downwards into the recess
30 degree position: minimum position
100 degree position: normal position
108 degree position: maximum position; the display is complete unfolded
When switched on, the LC display is first moved into the ”Last Function Memory” position. When terminal R is disconnected, the Central Information Display (CID) is always folded up and the last position is stored.
Last Function Memory: This function means that, when the system is started up, the Central Information Display (CID) resumes the function last set on the system prior to switching off. Depending on the last stored position, when the ignition key is inserted the following occur:
As of ignition lock position I (terminal R On) and LC display previously folded down: The LC display is automatically returned to this position (Last Function Memory position), as the navigation menu also restarts with the last detected menu.
As of ignition lock position I (terminal R On) and LC display previously folded up: A distinction is made between two cases:
Route guidance (navigation) was switched on (route guidance pr voice output continues even if the LC display is folded up). The LC display must fold up again automatically (menu item ”Resume route guidance” appears on the LC display).
Route guidance was switched off and the LC display folded up. The LC display remains folded up until operation of a button/DDK on the CID operating unit causes a change in the information content of the LC display (not, for example, volume control) or the ”Open/Close” switch on the recess is operated.
Fine adjustment with switch: From the ”Last Function Memory” position, manual positions changes are possible. The inclination of the LC display can be changed to improve legibility. The left-hand switch on the recess can be used to change the inclination in 1.2-degree steps in the range from 85 degrees to 108 degrees. The signal from the switch has a direct effect on the servomotor. The new position is stored.
Folding up and down with switch: The LC display can also be folded up and down using the right-hand switch on the recess. If the LC display is folded up manually or electrically while the vehicle is being driven, the LC display remains closed when the next trip is started (Last Function Memory position). The LC display must then be folded down using the right-hand switch.
Manual positioning: The LC display can also be folded down or up directly by hand without switch operation. The position of the LC display can also be changed manually when folded down. The last valid position is stored. In the case of movement by hand beyond 30 degrees towards 0 degrees, the LC display is folded up automatically. In the case of adjustment by hand from 0 degrees towards 108 degrees, the LC display automatically moves to the previously valid position after the limit of 30 degrees is exceeded.