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

GF80.50-P-2004RA Anti-Theft Alarm System Trigger, Function
- with CODE (494) USA version

Component Identification:

Function requirements:
^ Anti-theft alarm system (ATA) activated

Alarm actuation via contact switch
If one of the following contact switches terminates its non-actuated state for longer than 0.5 s, an acoustic and visual alarm is output:
^ Left door contact switch
^ Right door contact switch
^ ATA [EDW] left engine hood switch
^ ATA [EDW] right engine hood switch
^ Left rear box ATA [EDW] switch
^ Right rear box ATA [EDW] switch
^ Glove compartment switch
^ Pawl rotary tumbler switch
^ Center console stowage compartment ATA [EDW] switch

Alarm actuation by alarm signal horn
The status of the alarm signal horn is checked cyclically by the driver-side SAM control unit. If the alarm signal horn does not receive a signal within approx. 1 s, a visual alarm is output, because the communication is interrupted.

If the alarm signal horn recognizes the loss of the supply voltage or communication with the driver-side SAM control unit, it outputs an autonomous acoustic alarm (up to 30.11.06).

Alarm triggering by towing sensor
The rear SAM control module checks the input of the ATA inclination sensor several times per second. If the ATA inclination sensor recognizes a position change of the vehicle, an acoustic and visual alarm is triggered.

If the position change (e.g. tire defect) is very slow, the reference position is adapted to the vehicle position to avoid the ATA inclination sensor outputting a false alarm.

Function when voltage is too low
The operating voltage of the ATA is between 8.5 V and 15.5 V. It is possible to drop below a value of 8.5 V when the battery discharges continuously If the vehicle electrical voltage is below 7 V, an ATA alarm cannot be output according to definition (visually and acoustically), however only acoustically.

Alarm memory
Alarms triggered are stored in the driver-side SAM control unit. The alarm memory can be read out with STAR DIAGNOSIS. The alarm memory offers (at the time of the corresponding ATA alarm) additional information such as the window position and the vehicle voltage.

Repeated alarm
An alarm is only repeated when a new alarm procedure is accomplished after the active acoustic alarm is terminated Triggering the alarm again results in an extension of the visual and/or acoustic alarm. In the case of repetition the same activation times apply as for a new actuation.

Acoustic alarm
The acoustic alarm is output via the alarm signal horn. Type and duration of alarm are stored in the alarm signal horn memory.

Visual alarm
The visual alarm is output via the following lamps:
^ Left front fog lamp
^ Right front fog lamp
^ Left stop lamp, taillamp and parking lamp
^ Right stop lamp, taillamp and parking lamp
The interior lights is switched on additionally by the overhead control panel control unit.