E 320 CDI (211.026) L6-3.2L DSL Turbo (648.961) (2005)
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(E14/4) is defective or even installed.
The status is displayed in the instrument cluster (A1). Malfunctions are signaled by displaying error windows.
Roof sign actuation with mirror taximeter
A RS485 bus is employed as the connection between the taximeter control unit (A67n1) and the special vehicle multifunction control unit (SVMCU
[MSS]) (N26/9). The special vehicle multifunction control unit (SVMCU [MSS]) (N26/9) is the master in the bus and cyclically queries the status of the
taximeter control unit (A67n1). Information (roof sign status, circuit status) is likewise cyclically sent to the taximeter control unit (A67n1).
The following data are exchanged between the special vehicle multifunction control unit (SVMCU [MSS]) (N26/9) and taximeter via the RS485 bus:
The special vehicle multifunction control unit (SVMCU [MSS]) (N26/9), depending on the status of the signal of the "roof sign control signal", actuates
the roof sign lamp (E14/4).
The actuation of the roof sign lamp (E14/4) can be activated or disabled at the multifunction steering wheel. The activation or disabling is placed on the
CAN-interior by the instrument cluster (A1).
If the actuation at the multifunction steering wheel is activated:
^
Roof sign lamp (E14/4) lights up, if the taximeter control unit (A67n1) signals "VACANT"
^
Roof sign lamp (E14/4) goes out, if the taximeter control unit (A67n1) signals "COUNTER MODE" or is switched off
If the actuation at the multifunction steering wheel is disabled:
^
Roof sign lamp (E14/4) goes out
When the roof sign lamp (E14/4) is switched on, current at the roof sign output is measured. It can be detected in this way whether the roof sign lamp
(E14/4) is defective or even installed. The level of the detected load is transmitted to the taximeter control unit (A67n1) via the RS485 bus and displayed
in the taximeter display (A67p1).
The roof sign status is additionally displayed in the display screen of the instrument cluster (A1).
If the taximeter control unit (A67n1) signals the "Cashbox Status" via the RS485 bus, the interior light is switched on by the special vehicle
multifunction control unit (SVMCU [MSS]) (N26/9), but only if the overhead control panel control unit (N70) places the signal "Dark" on the
