The Flap Central Information Display (CID) is a folding LC display. Defined positions are set automatically by means of electric drive. In addition, positions can be changes using switches. Positioning by hand is also possible.
The Flap Central Information Display (CID) is the central display unit for the scope of functions:
Prerequisite for the socket of the Central Information Display (CID) is that the following components are fitted:
The K bus (Body Electronics) is used for data exchange between the control units of the body electronics and the microprocessor of the Flap Central Information Display (CID). Data is exchanged by means of data telegrams.
The D bus (Diagnostic Bus) is used for data exchange between the control unit of the Central Information Display (CID) and a diagnosis tester. Data is exchanged by means of data telegrams.
On the high navigation system, the MD/CD 53 operating unit (CID radio) is the operating unit for the Flap Central Information Display (CID). The MD/CD 53 operating unit (CID radio) communicates with the microprocessor of the Flap Central Information Display (CID) and other control units via the K bus. Data is exchanged by means of data telegrams.
The MD/CD 53 operating unit (CID radio) is fitted in the centre console beneath the centre fresh-air vent.
The Central Information Display (CID) consists of:
The LC display is an analog display. The LC display is activated with RGB and K bus signals. At the output, it issues K bus telegrams for processing by the navigation computer and the video module. The LC display has a function for automatic adjustment to the ambient light. The LC display with the control unit is fitted in a case secured to an axle. The case on the axle can be swivelled by means of the electrical drive between 0 degrees and 108 degrees. The positions of the LC display are detected by Hall sensors on the transmission gearing. The case and drive are fitted in a recess (holding frame). Data is exchanged by means of data telegrams.
The Central Information Display (CID) is fitted in the dashboard above the centre fresh-air vent.
The lights switching centre (LSZ) provides the information for the brightness setting on the LC display. For this, information from various sensors is processed. Data is exchanged by means of data telegrams.
As of terminal R On (or with corresponding K bus telegram), the Flap Central Information Display (CID) switches on and is powered up.
The LC display and the LCD backlighting are switched of when there is no signal on the bus for 30 seconds (after the bus goes to sleep).
The operating voltages for the Central Information Display (CID) are generated from the vehicle voltage and monitored fro under- and overvoltage.
Undervoltage: In the case of a vehicle voltage < 9 V, the Central Information Display (CID) is switched off. With a vehicle voltage > 10 V, it is switched on again automatically.
Overvoltage: In the case of a vehicle voltage >17 V, the Central Information Display (CID) is switched off. With a vehicle voltage < 16 V, it is switched on again automatically.
The temperature value established by the Central Information Display (CID) by means of a temperature sensor on the LC display, as well as other data, is used for brightness control. When ”excess temperature” is reached, the LC display is switched off.
Overtemperature is reached when the value obtained through the temperature sensor exceeds a threshold value stored in the Central Information Display (CID) for a defined period.
The state of the LC display is checked in cycles by the Central Information Display (CID). After the LC display has cooled down to operating temperature, it is switched on again.
The brightness control on the LC display is implemented via the lights switching centre (LSZ). Here, values determined by sensors, stored parameters and manual inputs via the dimmer wheel are included in the calculation.
The lights switching centre (LSZ) provides the brightness setting of the dimmer wheel as a power PWM signal (terminal 58g) and as a telegram on the K bus. The value of the K bus telegram reflects the angle of rotation of the dimmer. The change between day and night mode is derived from the K bus information.
The backlighting brightness is influenced by
In the case of brightness control, a distinction is made by means of stored threshold values for the photosensor and dimmer wheel between the normal brightness setting during the days and the following special case. At ignition lock position I with the light switched off and the TV switched on, the minimum ”light off” display brightness is set to ”day min TV”.
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:
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:
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.
In the event of a failure of the navigation computer or the video module, the LC display background light is switched off. The ”screen off” mode is activated. After 30 seconds, the LC display is folded up. The fault is stored.
The positioning of the LC display is stopped by anti-trapping protection when
The LC display stops in the position reached and the position is stored. The position of the Flap Central Information Display (CID) can only be changed by operating the right-hand switch or folding down by hand. The obstacle that caused the deactivation must have been removed beforehand.
The information stored in the fault code memory can be read out via the diagnostic bus with the diagnosis tester.