Emergency call system control unit, component description - GF82.95-P-3212TMB

MODEL 211 with CODE (359) TELE AID emergency call system with CODE (494) USA version as of Model Year 09/AEJ 08

Fig 1: Locating Emergency Call System Control Unit

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Location

The emergency call system control unit is located in the trunk on the implement carrier.

Task

The emergency call system control unit is responsible for the following functions:

Integrated telephone module for emergency call, Mercedes-Benz (MB)-Info call and roadside assistance call
Independent position sensing
Acquiring and storing vehicle-specific data (e.g. circuit status)
Actuation of the telephone antenna (A2/49a1) or of the backup antennas, consisting of the left backup antenna, emergency call system (A2/54) and the right backup antenna, emergency call system (A2/55)
Voice output via left front speaker (H4/9) and right front speaker (H4/10)
Input of crash data from the restraint systems control unit (N2/7) via a discrete line
Unlocking the vehicle in an emergency
Reading in the SOS switch (S93/3s1) and the MB-Info and breakdown assistance button group (S93/6) via 2 separate and discrete lines
Satellite data via the GPS antenna (A2/49a2)
Creation and provision of a message via Short Message Service (SMS)
Muting other audio signals (e.g. radio, navigation)

Design

The emergency call system control unit is designed primarily as follows:

Integrated telephone module
Integrated navigation module
Integrated additional battery
Memory for vehicle-specific data
Screened metal housing

Function

The emergency call system control unit has its own microprocessor. It also has 2 sub-units, a telephone module and a navigation module. The emergency call system control unit is the central processor for all the important data required for a Telematic Alarm Identification on Demand (emergency call system) (TELE AID) emergency call. The emergency call system control unit calculates the vehicle position with the aid of the installed navigation module and generates an emergency call telegram in the form of an SMS in the event of an emergency call.

The crash data from the restraint systems control unit is received via a serial interface.

The emergency call system control unit can be diagnosed via the central gateway control unit (N93) using STAR DIAGNOSIS. As of model year 08, the emergency call system control unit is also fishable.