GF80.50-P-2004RI Anti-Theft Alarm System Trigger, Function
GF80.50-P-2004RI Anti-Theft Alarm System Trigger, Function
General function requirements
^ Anti-theft alarm system (ATA) activated
ATA alarm triggering, general
If one of the alarm inputs of the activated ATA exits its non actuated state, an alarm is triggered.
Alarm actuation in the event of undervoltage
The operating voltage range of the ATA is defined from U = 8.5 to 16 V. If the voltage drops below U ≤7 V, it is no longer possible to trigger a visual alarm output. Only an acoustic alarm is triggered.
The ATA alarm triggering comprises the following subfunctions:
^ Function sequence for alarm actuation with contact switch
^ Function sequence for alarm actuation due to change of vehicle inclination
^ Function sequence for alarm triggering by motion in interior compartment (with code (882) Interior monitoring (only with ATA))
^ Function sequence for alarm triggering from communication loss to alarm signal horn (H3)
^ Function sequence for alarm output
^ Function sequence for alarm interruption
Function sequence for alarm actuation with contact switch
The rear SAM control unit (N10/8) actuates an alarm as soon as the non-actuated state of one of the following contact switch is interrupted for t > 0.5 s:
- Left door contact switch (S17/3)
- Right door contact switch (S17/4)
- Left ATA engine hood switch (S62)
- Right ATA engine hood switch (S62/1)
- Glove box switch, ATA (S62/7)
- Center console storage compartment ATA switch (S62/32)
- Left rear box ATA switch (S62/33)
- Right rear box ATA switch (S62/34)
- Pawl rotary tumbler switch (S88/4)
The switch status is read in by the driver-side SAM control unit (N10/10) via the interior CAN. For a new alarm actuation, the corresponding switch must first change to the non-actuated state (debounce time t = 500 ms).
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.
Additional function requirements for alarm triggering by changing vehicle inclination
^ Tow-away protection not deactivated
Function sequence for alarm actuation due to change of vehicle inclination
The rear SAM control module checks the input of the ATA inclination sensor several times per second.B33 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.
Additional function requirements for alarm triggering by motion in interior compartment
^ Interior protection not deactivated
Function sequence for alarm actuation from motion in interior compartment
The alarm decision is made with regard to duration and speed of the motion in the passenger compartment by the interior protection transmitter and receiver (A26/14). If the interior protection transmitter and receiver recognizes motion in the interior compartment, an acoustic and visual alarm is triggered.
Function sequence for alarm triggering from communication loss to 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. t = 1 s, a visual alarm is output because the communication is interrupted.
If the alarm signal horn detects the loss of the power supply or communication, it outputs automatically an acoustic alarm (except on vehicles with code (494) USA version, with code (460) Canada version or with code (498) Japan version), because an alarm signal horn with additional battery is installed here).
An alarm is only repeated if a new alarm event is registered after the active acoustic alarm was terminated.
Function sequence for alarm output
The following components of the exterior lights are actuated on vehicles with code (494) USA version:
- by the driver-side SAM control unit:
- Left turn signal light (E1e5)
- by the passenger-side SAM control unit (N10/11):
- Right turn signal light (E2e5)
- by the rear SAM control unit:
- Left turn signal light (E3e1)
- Right turn signal light (E4e1)
- by the left door control unit (N69/1):
- Left outside mirror turn signal lamp (E6/5)
- by the right door control unit (N69/2):
- Right outside mirror turn signal lamp (E6/6)
The following components of the exterior lights are actuated on vehicles without code (494) USA version:
- by the driver-side SAM control unit :
- Left front fog lamp (E5/1)
- by the passenger-side SAM control unit :
- Right front fog lamp (E5/2)
- by the rear SAM control unit:
- Brake light, taillight and left parking light (E3e9)
- Brake light, taillight and right parking light (E4e9)
The acoustic alarm is output via the alarm signal horn. Type and duration of alarm are stored in the alarm signal horn memory.
Function sequence for alarm interruption
An alarm is interrupted by opening the central locking (CL) of the vehicle with the transmitter key () or by switching on c. 15C (valid transmitter key (A8/1) inserted into EIS control unit (N73)).
The EIS control unit transmits the corresponding signal via interior CAN to the driver-side SAM control unit, which then terminates the activated alarm.
