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Home >> Mercedes Benz >> 2012 >> S 350 BLUETEC (221.183) V6-3.0L DSL Turbo (642.868) >> Repair and Diagnosis >> Relays and Modules >> Relays and Modules - Accessories and Optional Equipment >> Emergency Contact Module >> Description and Operation >> GF82.95-P-3005SXU Restraint System Control Unit Data, Function

GF82.95-P-3005SXU Restraint System Control Unit Data, Function



GF82.95-P-3005SXU Restraint System Control Unit Data, Function
- Model 221
- with CODE (389) Mobile phone preinstallation with universal interface, USA/Canada


The emergency call system control unit (N123/4) receives the messages listed in the following via a discrete line as a digital crash signal from the restraint systems control unit (N2/7) and additionally (redundantly) via the diagnostic CAN from the central gateway control unit (N93). The central gateway control unit receives the message via the chassis CAN from the restraint systems control unit.

Crash data on chassis CAN and diagnostic CAN

Byte no.1







Byte no.2







A vehicle crash is automatically detected by the restraint systems control unit. The emergency call system control unit receives the crash information as a digital crash signal from the restraint systems control unit via a discrete line, and additionally (redundantly) via the chassis CAN from the central gateway control unit. In the event of an accident, an emergency call is automatically sent out immediately. An emergency call is sent out regardless of the severity of the accident.

Error messages
The restraint systems control unit sends a signal every 500 ms. This indicates to the emergency call system control unit that the crash recognition feature is operating properly.

The restraint systems control unit performs a self-test cyclically. Any lighting of the red light emitting diode (LED) in the SOS pushbutton switch (S93/3) in normal mode indicates a fault in the Telematic Alarm Identification on Demand (emergency call system) (TELE AID). The corresponding error message is then shown on the COMAND display (A40/8) and in the multifunction display (A1p13) of the instrument cluster (A1). The red LED in the SOS pushbutton switch is illuminated until circuit 15 is switched off or the fault has been rectified. The SOS pushbutton switch is monitored. A stuck SOS pushbutton switch is detected. The fault signal is ignored and TELE AID remains operational.





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