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Home >> Mercedes Benz >> 2000 >> S430 >> Repair and Diagnosis >> Accessories & Equipment >> Wiper/Washer Systems >> Electrical System -- Basic Knowledge -- 215 & 220 Chassis - 2 Of 2 >> Basic Knowledge >> SOS switch, location/task/design/function - GF82.95-P-4107SX >> SOS switch, function - GF82.95-P-4107-04SX

SOS switch, function - GF82.95-P-4107-04SX

In park position, an electric current flows via the control resistance (parallel to the switch contact) installed in the SOS switch (S93/3s1). This helps the emergency call system control unit (N123/4) (with code (359) TELE AID emergency call system) or the telecommunications control unit (N112) (with code (383a) fixed installation telephone Tele-Aid) to detect that the feed line and the ground line are OK. When pressing the SOS switch (S93/3s1) the control resistance is bridged by a switch contact.

The SOS switch (S93/3s1) is read in by the emergency call system control unit (N123/4) (with code (359) TELE AID emergency call system) or by the telecommunications control unit (N112) (with code (383a) fixed installation telephone Tele-Aid) via a discrete line. The emergency call system control unit (N123/4) (with code (359) TELE AID emergency call system) or the telecommunications control unit (N112) (with code (383a) fixed installation telephone Tele-Aid) recognizes a manual emergency call when the SOS switch (S93/3s1) is pressed and then transmits the call.