Component description for emergency call system control unit - GF82.95-P-3212G

MODEL 463.249 up to 31.8.08 as of model year 2007 model year 07.5, modification year 07 

MODEL 463.271 as of model year 2007 model year 07.5, modification year 07 

MODEL 463.237 as of model year 2009/YoM 08 

Location 

The emergency call system control unit is located on the carrier plate under the front passenger seat.

Task 

The emergency call system control unit bundles the emergency call and service functions together. These functions are handled via the telephone function. The emergency call system control unit operates in the same manner as a telephone with hands-free system. Only the telematics services TELE AID emergency call, breakdown assistance and MB-Info are supported.

The emergency call system control unit is not used for regular telephone calls.

Following activation by the SOS push button (S93/3) or the MB-Info and breakdown assistance button group (S93/6), and following automatic activation by a crash signal received from the restraint systems control unit (N2/7), the emergency call system control unit sends the vehicle position, the identification as well as other necessary data to the service center (Customer Assistance Center).

Function 

• Position finding of the vehicle
• Diagnostic CAN data transfer
• Functions for ensuring data integrity
• Status indication on the COMAND operating, display and controller unit (A40/3)
• Modular antenna selection
• Diagnosis
• Error handling
• Transceiver control
• Management information base
• Discrete wake-up line
• Integrated communication module for emergency call and service
• Emergency call (manual/automatic)
• Breakdown assistance (Roadside Assistance/remote diagnosis (telediagnosis))
• Vehicle tracking
• Remote door unlock
• MB-Info call

Applications / Service functions 

• Emergency call, telediagnosis, MB-Info call
• Telephone, short message service, telematics services

Signal inputs and outputs 

Discrete inputs:

• Terminal 30
• Circuit 31
• Wake-Up
• Restraint systems control unit
• SOS pushbutton switch
• MB-Info and breakdown assistance button group
• Hands-free system microphone group (A67b1)

Discrete outputs:

• Center cockpit speaker (centerfill) (H4/27) (as of 1.9.10)
• Left front emergency call speaker (H4/46) (up to 31.8.10)
• Right front emergency call speaker (H4/47) (up to 31.8.10)
• Audio muting
• Light emitting diode in SOS pushbutton switch
• Light emitting diode in MB-Info and breakdown assistance button group
• Telephone and fax antenna (A2/22)
• Emergency call antenna (A2/52)