Central Information Display - Fault Analysis Guide
SI B 65 06 05Sound System, Cruise, Alarms, Monitors
July 2005
Technical Service
SUBJECT
Central Information Display (CID) Fault Analysis Guide
MODEL
E60/61 (5 Series)
E63/64 (6 Series)
INFORMATION
Certain fault patterns are visible on the CID (Central Information Display) although they are caused by another control unit.
To avoid unnecessary replacement of the CID and to prevent an additional repair, follow the Fault Analysis Guide shown in combination with the notes below.
CID power and data supply wiring
The CID serves the purpose of displaying information from the CCC/M-ASK and does not generate any output itself.
The CID is switched on and off via the CCC/M-ASK and the display is operated by the following signals:
^ Ground connection (KL 30).
^ Terminal 30g.
^ K-CAN connection (logical control).
^ LVDS data line (digital image signals from CCC/M-ASK).
CID screen failure
In the event of temporary screen failure during operation, with simultaneous failure of sound output, the CID is not defective. If this condition occurs, the function of the CCC/M-ASK should be checked first (fault code entry FC # A3E4 is stored in the CCC-BO).
The proper function of the CCC/M-ASK should also be checked when delayed switching on, frozen graphics or partially missing image content occurs.
Faults related to LVDS (Low Voltage Differential Signal) data line
If there is a fault entry related to the LVDS (FC # A468), the function of the CCC/M-ASK and the cable from the CCC/M-ASK to the CID should be checked first.
The LVDS driver in the CCC/M-ASK receives the digital RGB signals from the graphic processor, converts the RGB signals and sends them via the LVDS cable to the Central Information Display.
Faults related to back lighting
The back lighting of the CID is controlled via the bus from the CCC/M-ASK. If the CID does not switch on its back lighting at Terminal 15, a check must be run as to whether the CCC/M-ASK and K-CAN are operating without problems.
Faults related to excessive temperature
Excessive/high temperature in the CID can be caused by:
^ High ambient temperature.
^ Direct radiation from the sun.
^ Hot air from a heating duct.
In this case, the CID lowers its brightness.
In extreme situations, the CID will switch off its back lighting because of an over-temperature protection function and a fault code entry (FC # A46A) will be stored in the CID fault memory.
Faults related to brightness
Changes in brightness of the CID can lead to customer complaints.
The brightness of the CID is controlled by various signals. In the event of an unexpected change, check the following:
^ Individual brightness settings can be selected for the CID via the Controller. The selected brightness settings depend on the information stored in the remote key.
^ Under certain circumstances, the brightness setting can be reset after programming or after a low voltage situation.
^ When very high temperatures occur in the CID, brightness is reduced.
^ The brightness of the CID is also controlled by the signal coming from Terminal 58g (panel dimmer), as soon as the lights are switched on. It can be changed manually.
^ The brightness of the CID is adjusted depending on the ambient light intensity detected by the photo-cell on the front of the LCD.
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