E 350 Sedan (212.056) V6-3.5L (272.980) (2010)
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Function sequence for emergency call system status for breakdown assistance
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Function sequence for emergency call system status for MB-Info call
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Function sequence for emergency call system status for vehicle remote door unlock
Function requirement for emergency call system status in non- actuated state
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C. 15R On
Function sequence for emergency call system status in nonactuated state
As soon as circuit 15R is activated, the two red light-emitting diodes integrated in the emergency call system button light up during the self-test of the
emergency call system control unit for approx. t = 4 s. Actuation is accomplished by the emergency call system control unit via a discrete line.
This signals the self-test and the checking of the following emergency call system statuses:
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Emergency call system control unit power supply
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Functions within the emergency call system control unit (e.g. integrated communication module or memory)
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Communication with the supplemental restraint system control unit (N2/10) and the Electronic Stability Program control unit (N30/4) (without
code (233) DISTRONIC PLUS) or the Premium Electronic Stability Program control unit (N30/7) (with code (233) DISTRONIC PLUS).
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Emergency call system button, breakdown assistance function and MB Info button function (e.g. button that is stuck or open)
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Emergency call system antenna function (A2/52)
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Global positioning system antenna splitter function (A2/5) (with code (512) COMAND APS with DVD changer)
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Multifunction antenna function (A28/11)
Circuit 15R status is received by the emergency call system control unit from the electronic ignition lock control unit (N73) via the following route:
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Interior CAN (CAN B)
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Front SAM control unit with fuse and relay module (N10/1)
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Diagnostic CAN (CAN D)
The emergency call system control unit communicates with the supplemental restraint system control unit ("LIFE signal" every t = 500 ms) and the
Electronic Stability Program control unit via the following route:
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Chassis CAN (CAN E)
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Front SAM control unit
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Diagnostic CAN
The following components are checked each over a discrete line:
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Supplemental restraint system control unit
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Emergency call system button, breakdown assistance button and MB Info button
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Emergency call system antenna
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Global positioning system antenna splitter (with code (512) COMAND APS with DVD changer)
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Multifunction antenna
If no fault is present, the two red light-emitting diodes integrated in the emergency call system button go out after approx. t = 4 s and thereby signal
operational readiness of the emergency call system If a fault is present, the two red light-emitting diodes integrated in the emergency call system button
are permanently actuated by the emergency call system control unit via a direct line. Depending on the fault type, a message is displayed in the
instrument cluster and filed in the memory of the emergency call system control unit.
The message is displayed in the instrument cluster by the emergency call system control unit in the following way:
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Diagnostic CAN
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Front SAM control unit
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Interior CAN
Function requirements for emergency call system status for automatic emergency call
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C. 15R On
Function sequence for emergency call system status for automatic emergency call
After triggering an automatic emergency call (crash detection with "crash level") the emergency call system control unit intermittently actuates one of the
two red light-emitting diodes integrated in the emergency call system button via a direct line. This is also indicated in the instrument cluster and on the
Audio/COMAND display.
This is displayed on the instrument cluster via the following route:
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Diagnostic CAN
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Front SAM control unit
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Interior CAN
The information is displayed on the Audio/COMAND display via the following route:
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Diagnostic CAN
