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Home >> Mercedes Benz >> 2011 >> C350 >> Repair and Diagnosis >> Accessories & Equipment >> Anti-Theft Systems >> Anti-Theft/Central Locking System - C63/C350 (204) - 2 Of 2 >> Basic Knowledge >> Trigger alarm with panic switch, function (MODEL 204.0 with CODE 551 or 763 up to Model Year 8)- GF80.50-P-3014CWU

Trigger alarm with panic switch, function (MODEL 204.0 with CODE 551 or 763 up to Model Year 8)- GF80.50-P-3014CWU

MODEL 204.0 with CODE (551) Anti-theft alarm system (ATA [EDW]) 

with CODE (763) Radio remote control with panic switch up to Model Year 8 

Function requirements: 

General 

The panic alarm allows a visual and acoustic alarm to be triggered by the anti-theft alarm system (ATA) with the transmitter key (A8/1) (e.g. in an emergency).

IMPORTANT Function sequence when panic alarm and ATA are actuated simultaneously

The panic alarm has priority over the ATA alarm

If both alarms are actuated the panic alarm is output due to its higher priority and the ATA alarm is suppressed This alarm is still actuated in the background. If one of the two alarms is terminated or is interrupted, the other is still actuated.

General function sequence for alarm actuation by panic switch 

Activation by panic switch includes several partial functions. These are:

Function sequence for actuating panic alarm 

When the panic alarm button in the transmitter key is pressed for t ≥2 s, it transmits a radio signal via the FM, AM and CL antenna amplifier (A2/18) to the rear SAM control unit with fuse and relay module (N10/2) and relays it to the electronic ignition lock control unit (N73).

Parallel to the radio signal, an infrared signal is transmitted to the driver-side front door infrared remote control receiver (A26/1) (precise aiming required).

This signal is read in by the left front door control unit (N69/1) and transmitted to the electronic ignition lock control unit.

In both cases, the electronic ignition lock control unit checks the access authorization of the transmitter key.

If the access authorization is valid, the electronic ignition lock control unit transmits the "Activate panic alarm" command to the rear SAM control module.

It then outputs the requests for the visual and acoustic alarm via the interior CAN.

Alarm output for panic alarm 

Alarm is output via the exterior lights, the interior lights as well as the alarm siren (H3/1).

Function requirement 

Function sequence for panic alarm output 

The acoustic signal is output by actuating the alarm siren by the rear SAM control unit via rear SAM-LIN.

The interior lights are switched on by the front SAM control unit with fuse and relay module (N10/1).

The following components are actuated for the exterior lights:

The duration of the visual and acoustics panic alarm is the same, however, stored separately in the alarm siren and in the rear SAM control unit.

Function sequence for interrupting panic alarm 

The panic alarm is interrupted when the panic alarm button on the transmitter key is actuated briefly.

The function sequence for interrupting the panic alarm is identical with that for actuating the panic alarm

REFER TO SYSTEM WIRING DIAGRAMS Function schematic for electric anti-theft alarm system, alarm actuation by panic switch   PE80.50-P-2054-99FAA 
  Transmitter key, component description A8/1 GF80.57-P-6010CW 
  Infrared remote control receiver, component description A26/1 GF80.30-P-6000CW 
  Lamp unit, component description E1, E2 GF82.10-P-2017CW
  Rear lamp unit, component description E3, E4 GF82.10-P-2018CW
  Alarm siren, component description H3/1 GF80.50-P-6060CW 
  Front SAM control unit with fuse and relay module, component description N10/1 GF54.21-P-6070CW
  Rear SAM control unit with fuse and relay module, component description N10/2 GF54.21-P-6030CW
  Left front door control unit, component description N69/1 GF72.29-P-6001CW
  Right front door control unit, component description N69/2 GF72.29-P-6009CW
  Electronic ignition lock control unit, component description N73 GF80.57-P-6001CW