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

MODEL 221.0/1 as of 1.1.06 with CODE (494) USA version up to Model Year 8

MODEL 221.0/1 with CODE (389) Mobile phone preinstallation with universal interface, USA/Canada up to Model Year 8

MODEL 216.3 with CODE (494) USA version up to Model Year 8

Illustrated on model 221

Fig 1: Identifying Emergency Call System Control Unit - Illustrated On Model 221

Courtesy of MERCEDES-BENZ USA

Location

The emergency call system control unit is located in the luggage compartment at the left front at the rear wall.

Task

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

Integrated telephone module for Telematic Alarm Identification on Demand (emergency call system) (TELE AID) emergency call, MB-Info call and telediagnosis call
Independent position sensing
Acquiring and storing vehicle-specific data (e.g. circuit status)
Actuation of telephone and GPS roof antenna (A2/49) (on model 221) or of the telephone and GPS antenna (A2/49) (on model 216), over the frequency switchover control unit (N96), or actuation of the backup antennas, consisting of the emergency call system left backup antenna (A2/54) and the emergency call system right backup antenna (A2/55), over the emergency call system antenna splitter (A2/25)
Voice output over the center cockpit center speaker (centerfill) (H4/27)
Input of crash data from the restraint systems control unit (N2/7) via a discrete line
Vehicle remote door unlocking
Vehicle remote door locking
Reading in the SOS pushbutton switch (S93/3) and MB-Info and telediagnosis button group (S93/6) over 2 separate and discreet lines
Satellite data from the telephone and GPS roof antenna (on model 221) or from the telephone and GPS antenna (on model 216), over the antenna splitter
Generating and keeping an SMS ready
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. All the relevant data for a TELE AID emergency call are processed centrally in the emergency call system control unit. The emergency call system control unit calculates the vehicle position with the aid of the installed navigation module and generates a TELE AID emergency call telegram in the form of an SMS in the event of a TELE AID emergency call.

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

The emergency call system control unit can be diagnosed over a diagnosis CAN through the central gateway control unit (N93) using STAR DIAGNOSIS.