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Home >> Mercedes Benz >> 2002 >> C240 Standard >> Repair and Diagnosis >> Body & Frame >> Ignition Switch/Steering Lock >> Anti-Theft & Central Locking -- 203 Chassis >> Basic Knowledge >> Trigger anti-theft alarm system, function - GF80.50-P-2004PP

Trigger anti-theft alarm system, function - GF80.50-P-2004PP

MODEL 203.0 /2 /7 with CODE (551) Anti-theft alarm system (ATA [EDW]) 

Alarm inputs shown on model 203.2 

Fig 1: Identifying Trigger Anti-Theft Alarm System, Function
G04735407

Function requirements: 

Alarm actuation via contact switch 

If the

exits its non-actuated state for longer than 0.5 s, an alarm is triggered. The rear SAM control unit with fuse and relay module (N10/2) initiates an acoustic and visual alarm.

Alarm actuation with alarm signal horn with additional battery (H3/1) 

The alarm signal horn with additional battery (H3/1) is actuated cyclically by the rear SAM control unit with fuse and relay module (N10/2). If no reply is received from the alarm signal horn with additional battery (H3/1) within 1 s, an alarm is triggered. The output is only visual, since the alarm signal horn with additional battery (H3/1) cannot be actuated

If the alarm signal horn with additional battery (H3/1) detects loss of the supply voltage or the communication, it outputs an acoustic alarm automatically.

The alarm signal horn with additional battery (H3/1) automatically outputs an alarm, if the connection lines or the vehicle battery is disconnected when the anti-theft alarm system (ATA) is activated.

Alarm actuation by tow-away protection (TS) (as of 1.6.06 not USA ONLYand JAPAN ONLY

The rear SAM control unit with fuse and relay module (N10/2) checks the input of the ATA inclination sensor (B33) several times per second. If the ATA inclination sensor (B33) detects a position change of the vehicle, an alarm is triggered.

The tow-away protection (TS) can trigger an alarm a maximum of three times in sequence. Then the anti-theft alarm system (ATA) must be reactivated for realizing this function.

Alarm actuation by interior protection (IRS) (with code (882) Interior monitoring (with ATA only)) 

The alarm decision is accomplished by considering the duration and the speed of the motion in the interior compartment.

If the interior protection transmitter and receiver (A26/14) (model 203.0/2) or the left interior protection transmitter and receiver (A26/4) (model 203.7) detects a break-in into the vehicle, the rear SAM control module with fuse and relay module (N10/2) outputs an acoustic and visual alarm.

IMPORTANT On vehicles with code (345) Rain sensor as of 31.1.03 in combination with code (414) Power glass tilting/sliding roof or with code (413) Panoramic sliding roof, the tilting/sliding roof or the panoramic sliding roof of the interior protection (IRS) is deactivated during rain closing.

The interior protection (IRS) can trigger a maximum of three alarms in sequence. Then the anti-theft alarm system (ATA) must be reactivated for realizing this function.

Alarm actuation by glass breakage (model 203.2) (with code (882) Interior monitoring (with ATA only)) 

The left rear window glass breakage sensor (B39), right rear window glass breakage sensor (B39/1) and rear window glass breakage sensor (B39/4) are connected to the interior protection transmitter and receiver (A26/14) and, in the event of glass breakage (line interruption), transmit a signal to the rear SAM control module with fuse and relay module (N10/2) which then starts an acoustic and visual alarm.

Alarm actuation by glass breakage (model 203.7) (with code (882) Interior monitoring (with ATA only)) 

The rear window glass breakage sensor (B39/4) is connected to the left interior protection transmitter and receiver (A26/4) and, in the event of glass breakage (line discontinuity) relays a signal to the rear SAM control module with fuse and relay module (N10/2) which then initiates an acoustic and visual signal.

Alarm actuation by trailer monitor (with code (550) Trailer hitch) 

The lines are monitored for discontinuity by applying a control voltage from the trailer recognition control unit (N28/1) to the trailer loads If line discontinuity is recognized, the status "Trailer not recognized" is transmitted to the rear SAM control module with fuse and relay module (N10/2) via CAN B (CAN B). It then starts an acoustic and visual alarm.

Alarm memory as of 24.4.04 

Alarm triggered (max. 15) and additional information, such as the window and tilting/sliding roof position, can be read out in the SAM control module with fuse and relay module (N10/2) and in the central gateway control module (up to 27.7.04) or in the EIS control module (as of 28.7.04) with STAR DIAGNOSIS.

Visual alarm 

The alarm output is actuated by the rear SAM control module with fuse and relay module (N10/2). The type of alarm and alarm duration are stored in the rear SAM control module with fuse and relay module (N10/2).

Alarm duration 

Vehicles with USA ONLY version: approx. 150 s

Other countries: approx. 300 s

Actuation of exterior lights (not USA ONLY

The visual alarm is accomplished when the

for the duration of a visual alarm.

Actuation of exterior lights ( USA ONLY

The visual alarm is accomplished when

for the duration of a visual alarm.

Interior lights actuation 

The interior lights is switched on by the overhead control panel control module (N70), without dimming, for the duration of the visual alarm.

Acoustic alarm 

The acoustic alarm is output by the alarm signal horn with additional battery (H3/1).

Alarm duration 

All countries: approx. 30 s

Alarm interruption 

The alarm can be interrupted by actuating the "Lock" or "Unlock" buttons on the transmitter key.

When the alarm is interrupted by actuating the "Lock" button the antitheft alarm system (ATA) remains still activated.

  Central gateway control unit, location/task As of 24.4.04 up to 27.7.04 GF00.19-P-4100PP
  Front SAM control unit with fuse and relay module, location/task/design   GF54.21-P-4108PP
  Rear SAM control unit with fuse and relay module, location/task/design/function   GF54.21-P-4115PP
  Interior protection transmitter and receiver, location/task/design/function Model 203.0/2 with code (882) Interior monitoring (with ATA only) GF80.50-P-4104PP 
    Model 203.7 with code (882) Interior monitoring (with ATA only) GF80.50-P-4104P 
  Inclination sensor, location/task/design/function Up to 31.5.06,
As of 1.6.06 without code (494) USA version or without code (498) Japanese version
GF80.50-P-4105PP 
  Glass breakage sensor, location/task/design/function Model 203.2 with code (882) Interior monitoring (with ATA only) GF80.50-P-4107PS 
    Model 203.7 with code (882) Interior monitoring (with ATA only) GF80.50-P-4107PC 
  Alarm signal horn, location/task/design/function   GF80.50-P-4110Q 
  Electronic ignition switch control unit, location/task/design/function   GF80.57-P-4102PP 
  Overhead control panel control unit, location/task/design   GF82.20-P-4110A