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Anti-Theft Alarm System Trigger, Function - GF80.50-P-2004KJ

MODEL 453.0/3/4 

Function requirements, general 

IMPORTANT The center SAM control unit (N10/10) transmits the status of the CL via the alarm system LIN (LIN B14) to the alarm siren (H3/1) (with retrofitted ATA).

ATA alarm triggering, general 

If one of the alarm inputs of the activated ATA [EDW] exits its non-actuated state, an alarm is triggered.

Action in event of undervoltage: 16 V

The operating voltage range of the ATA [EDW] is defined from U = 8 to 16 V. No more visual or acoustic alarms can be output if the voltage drops to U ≤ 8 V.

The acoustic alarm is output with code V19 (Antitheft alarm system) via alarm signal horn (H3) and with retrofitted ATA with interior protection via alarm siren (H3/1). The visual alarm is output via the turn signals (hazard warning flasher). In addition the interior illumination is switched on. The hazard warning system switch (S6/1s1) is monitored via the alarm siren when the alarm is activated and with retrofitted ATA with interior protection. Deactivation of the hazard warning flasher when an alarm is actuated via the hazard warning system switch is prevented by this. The ATA [EDW] alarm triggering function comprises the following partial functions:

Function sequence for alarm actuation by opening a door, trunk lid or service flap 

The center SAM control unit actuates an alarm so soon as the one of the following switches exits the non-actuated state:

The center SAM control unit directly reads in the status of the individual central locking microswitch, trunk lid contact switch and ATA switch, battery and evaluates the status of all other alarm inputs. To trigger a new alarm, the corresponding switch must first change to the non-actuated state. After a non-actuated state of t = 10 s an alarm can be reactuated by the same switch, if an acoustic alarm is not present.

IMPORTANT If a locked vehicle is unlocked with the emergency key and the door is opened, the ATA [EDW] triggers an alarm.

Function sequence for alarm actuation by changing vehicle inclination (only with retrofitted ATA with interior protection and tow-away protection) 

Function requirements: 

If the tow-away sensor (B33) recognizes an alarm-relevant change of inclination, an alarm is output. For this purpose the tow-away sensor transmits a signal via alarm system LIN (LIN B14) to the alarm siren.

Actuation criterion:

Changing of the vehicle inclination (on the horizontal axes) to approx. > 1.2°.

IMPORTANT Alarm is triggered before a wheel looses ground contact when lifting the vehicle.

Function sequence for alarm actuation by movements in the vehicle interior (only with retrofitted ATA with interior protection) 

Function requirements: 

IMPORTANT The interior protection can be deactivated by extensively pressing on the lock button on the transmitter key (A8/1) when the vehicle is closed. On model 453.0/3 the vehicle interior can be monitored via the ultrasonic sensor, ATA (B39/2) and ultrasonic sensor 2, ATA (B39/9) by the ATA control unit (N26). These transmit the ultrasonic signals to the vehicle interior. On model 453.4 the vehicle interior is monitored by microwaves via the interior protection sensor 1 (B44/5) and interior protection sensor 2 (B44/6). If a movement in the vehicle interior is recognized and considered to be alarm-relevant, an alarm is output. On model 453.0/3 the ultrasonic sensors transmit a signal to the ATA control unit, which activates the alarm siren via alarm system LIN. On model 453.4 the interior protection sensors directly transmit an alarm signal directly to the alarm siren via the alarm system LIN. The alarm siren triggers an acoustic alarm and activates the visual alarm output via the electrical connection to the hazard warning flasher switch. It also transmits a signal to the center SAM control unit via the alarm system LIN.

The sensitivity of the interior protection is reduced depending on the following conditions:

Function sequence for alarm actuation by communication loss to alarm siren (only with retrofitted ATA with interior protection) 

The alarm siren is actuated cyclically approx. every t = 600 ms by the center SAM control unit via the alarm system LIN. If this signal is not received within t = 1 s by the alarm siren (no communication), the center SAM control unit and alarm siren trigger an alarm. If the alarm siren detects a loss of supply voltage, it also automatically emits an acoustic alarm.

Function sequence for alarm output 

Visual alarm output

When an ATA alarm is triggered, with code V19 (antitheft alarm system), the center SAM control unit activates the "Hazard warning flasher" function. All turn signals on the vehicle are actuated synchronously. With retrofitted ATA with interior protection, the alarm siren activates the visual alarm output via the electrical connection to the hazard warning system switch, if the alarm is actuated by the interior protection or tow-away protection. On vehicles with code 494 (USA version), the panic alarm can be triggered in addition via the transmitter key.

IMPORTANT Detailed information on performing the hazard warning flasher function is included in the function description "Exterior lights, function" in the sub-function "Turn signal light actuation, function".

Moreover, the center SAM control unit switches on the interior illumination.

IMPORTANT Detailed information on performing the interior illumination function is included in the function description "Interior illumination, function" in the partial function "Automatic interior illumination function".

Acoustic alarm output 

The acoustic alarm is output with code V19 (Antitheft alarm) by actuating the alarm signal horn (H3) via the center SAM control unit.

With retrofitted ATA with interior protection, a signal is transmitted to the alarm siren to output an alarm via alarm system LIN by the ATA control unit (model 453.0/3) or via the interior protection sensors (model 453.4) or tow-away protection sensor (with tow-away protection). Then the alarm system outputs an acoustic alarm.

IMPORTANT An alarm is only repeated if a new alarm event is registered after the active acoustic alarm was terminated. Three or ten alarms can be output in a severity cycle, depending on the national version (Belgium, Netherlands and Great Britain).

IMPORTANT The acoustic and visual alarm is activated for t= 80 s.

IMPORTANT Interruption conditions: The alarm output is interrupted by opening the CL with the transmitter key.

Actuating panic alarm (only with code (494) USA version) 

If the panic alarm button on the transmitter key is pressed for T ≥ 1 s, a radio signal is transmitted to the center SAM control unit, which checks the transmitter key authorization. If the authorization is valid, an acoustic and a visual alarm are triggered.

The acoustic alarm is issued via the horn, and the visual alarm is issued via the:

Actuation takes place directly via the center SAM control unit.

IMPORTANT Detailed information on performing the hazard warning flasher function is included in the function description "Exterior lights, function" in the sub-function "Turn signal light actuation, function".

  Overview of system components for theft protection and locking   GF80.00-P-9999KJ 
  Electrical function schematic for anti-theft alarm system Vehicles with code V19 (Antitheft alarm system) PE80.50-P-2055BBA 
  Electrical function schematic for retrofitted anti-theft alarm system Vehicles with retrofitted alarm system and interior monitoring PE80.50-P-2056BBA 
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