GF82.95-P-3210SXU SOS Switch, Component Description

GF82.95-P-3210SXU SOS Switch, Component Description
- Model 221
- with CODE (389) Mobile phone preinstallation with universal interface, USA/Canada

Component Identification:

Location
The SOS pushbutton switch is integrated in the overhead control panel control unit (N70).

Task
The following are the primary tasks of the SOS pushbutton switch:
^ Actuation of a manual Telematic Alarm Identification on Demand (emergency call system) (TELE AID) emergency call
^ Visual feedback signal of the TELE AID operating conditions in the event of a manual as well as an automatic emergency call

Design
The SOS pushbutton switch is designed primarily as follows:
^ Switch contact
^ A control resistor in parallel to the switch contact
^ Cap with inscription "SOS"
^ Integrated light-emitting diodes (LED) for night illumination (circuit 58d) and to indicate operating condition

Function
In the park position, electric current flows through the control resistor installed in the SOS pushbutton switch (parallel to switch contact). When current is flowing through the resistor, the emergency call system control unit (N123/4) knows that the voltage supply line and the ground line are functioning properly. When pressing the SOS pushbutton switch, the control resistor is bridged by a switch contact. The SOS pushbutton switch is read in by the emergency call system control unit over a discreet line. When the SOS button is pressed, a manual emergency call is recognized by the emergency call system control unit and then transmitted.