GF80.50-P-2004LE Anti-Theft Alarm System Trigger, Function
GF80.50-P-2004LE Anti-Theft Alarm System Trigger, Function
- with CODE (551) Anti-theft alarm system (ATA [EDW])
General function requirements
^ Anti-theft alarm system (ATA) activated
Anti-theft alarm system 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 to 16 V. If the voltage drops below U ≤8 V, it is no longer possible to trigger a visual alarm output. Only an acoustic alarm is triggered. The battery voltage is stored in the ATA alarm memory in the rear SAM control unit with fuse and relay module (N10/2).
The ATA alarm triggering comprises the following partial functions:
^ Function sequence for alarm actuation by opening a door, trunk lid or engine hood
^ Function sequence for alarm actuation by changing vehicle position (without code (494) USA version, without code (460) Canada version or without code (498) Japan version)
^ Function sequence for alarm triggering by motion in interior compartment (with code (882) Interior monitoring (only with ATA))
^ Function sequence for alarm actuation from communication loss to alarm siren (H3/1)
^ Function sequence for emergency opening (with code (494) USA version)
^ Function sequence for alarm output
^ Function sequence for alarm interruption
Function sequence for alarm actuation by opening a door, trunk lid or engine hood
The rear SAM control unit actuates an alarm as soon as the nonactuated state of one of the following switches is interrupted for t > 0.5 s:
- Left rotary tumbler switch (A85s1) (model 216) or left front rotary tumbler switch (A85s1) (model 221)
- Right rotary tumbler switch (A85/1s1) (model 216) or Right front rotary tumbler switch (A85/1s1) (model 221)
- Left rear rotary tumbler switch (A85/3s1) (model 221)
- Right rear rotary tumbler switch (A85/4s1) (model 221)
- Engine hood ATA switch (S62)
- Trunk lid rotary tumbler microswitch (M14/7s3)
The status of the rotary tumbler is read in by the
- Left door control unit (N69/1) (model 216) or left front door control unit (N69/1) (model 221),
- Right door control unit (N69/2) (model 216) or right front door control unit (N69/2) (model 221),
- Left rear door control unit (N69/3) (model 221) or right rear door control unit (N69/4) (model 221)
and transmitted to the rear SAM control unit via the interior CAN.
The ATA engine hood switch and the trunk lid rotary tumbler microswitch are read in directly by the rear SAM control unit. 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.
If a locked vehicle is unlocked with the mechanical key and the door is opened, the ATA triggers an alarm.
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
If the inclination sensor integrated into the alarm siren recognizes an alarm-relevant inclination, an alarm is output. The corresponding signal is relayed to the rear SAM control unit with the rear SAM- LIN.
Actuation criterion:
Change in vehicle inclination (horizontal axis) 1° to -1°, ±0.2°
Alarm is recognized before a wheel looses ground contact when lifting the vehicle.
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 signals from the ultrasonic echo sounder sensor (A26/13) (with code (882) Interior monitoring (only with ATA)) are read in by the rear SAM control unit.
If a movement in the vehicle interior is recognized and considered to be alarm-relevant, an alarm is output.
On vehicles with tilting/sliding roof (SHD) (with code (414) Electric glass tilting/sliding roof) or panoramic sliding roof (with code (413) Panoramic glass sunroof with top sliding sunroof) the interior compartment is not monitored during activated rain closing.
Function sequence for alarm triggering from communication loss to alarm siren
The alarm siren is actuated cyclically by the rear SAM control unit via the rear SAM-LIN. If a reply to this request is not received within t = 1 s by the alarm siren (no communication), the rear SAM control unit and alarm siren trigger an alarm. If the alarm siren detects a loss in the supply voltage, it also outputs an acoustic alarm automatically.
An alarm is only repeated if a new alarm event is registered after the active acoustic alarm was terminated.
Function sequence for emergency opening
The trunk lid emergency opening switch (S88/10) ensures that the trunk lid can also be opened from the inside of the trunk lid when the vehicle is locked. The rear SAM control unit reads in and evaluates the trunk lid emergency opening switch. The ATA triggers an alarm when the trunk lid emergency release switch is actuated.
Function sequence for alarm output
The following components for the exterior lights are actuated to output a visual alarm:
- by the front SAM control unit with fuse and relay module (N10/1):
- Left turn signal light (E1e5)
- 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 (model 216) or left front door control unit (model 221):
- Left outside mirror turn signal light (E6/5)
- by the right door control unit (model 216) or right front door control unit (model 221):
- Right outside mirror turn signal lamp (E6/6)
The acoustic alarm is output by the rear SAM control unit actuating the alarm siren via the rear SAM-LIN. The interior illumination is switched on by the overhead control panel control unit (N70).
Function sequence for alarm interruption
An alarm is interrupted by opening the central locking (CL) of the vehicle with the transmitter key (A8/1) or by switching on circuit 15C (valid transmitter key inserted into EIS control unit (N73)).
The EIS control unit transmits the corresponding signal via the interior CAN to the rear SAM control unit, which then terminates the activated alarm.
