CL 550 4MATIC (216.386) V8-5.5L (273.961) (2009)
If a malfunction is not present, the two red LEDs integrated into the SOS pushbutton switch extinguish after t = 4 s signaling that the emergency call
system is ready for operation.
If a fault exists, it is stored in the memory of the emergency call system control unit. Depending on the fault type, a message is also displayed in the
instrument cluster and the two red LEDs integrated in the SOS push button are permanently actuated by the emergency call system control unit via a
direct line.
The message is displayed in the instrument cluster by the emergency call system control unit via the following route:
-
Diagnostic CAN
-
Central gateway control unit
-
Central CAN
Function requirements for emergency call system status for automatic emergency call
^
Circuit 15R
Function sequence for emergency call system status for automatic emergency call
After an automatic emergency call has been triggered (crash recognition including crash level), the emergency call system control unit actuates one of the
two red LEDs integrated into the SOS push button intermittently via a direct line. One of the two LEDs flashes throughout the actuation period. This is
also indicated in the instrument cluster and on the COMAND display. This is displayed on the instrument cluster via the following route:
-
Diagnostic CAN
-
Central gateway control unit
-
Central CAN
The display on the COMAND screen is transmitted via the following route:
-
Diagnostic CAN
-
Central gateway control unit
-
Central CAN
-
COMAND controller unit (A40/3)
-
Low voltage differential signal (LVDS) line
Function requirements for emergency call system status for manual emergency call
^
Circuit 30
Function sequence for emergency call system status for manual emergency call
After a manual emergency call has been triggered with the SOS push button, the emergency call system control unit actuates one of the two red LEDs
integrated into the SOS push button intermittently via a direct line. One of the two LEDs flashes throughout the actuation period. This is also indicated in
the instrument cluster and on the COMAND display. This is displayed on the instrument cluster via the following route:
-
Diagnostic CAN
-
Central gateway control unit
-
Central CAN
The display on the COMAND screen is transmitted via the following route:
-
Diagnostic CAN
-
Central gateway control unit
-
Central CAN
-
COMAND controller unit
-
LVDS line
Function requirements for emergency call system status for breakdown assistance
^
Circuit 30
Function sequence for emergency call system status for breakdown assistance
After the breakdown assistance has been triggered with the telediagnosis button, the emergency call system control unit actuates the red LED integrated
into the telediagnosis button intermittently via a direct line. The LED flashes during the actuation period. This is also indicated in the instrument cluster
and on the COMAND display.
This is displayed on the instrument cluster via the following route:
-
Diagnostic CAN
-
Central gateway control unit
-
Central CAN
The display on the COMAND screen is transmitted via the following route:
-
Diagnostic CAN
-
Central gateway control unit