GF80.50-P-2004CE Anti-Theft Alarm System Trigger, Function
GF80.50-P-2004CE Anti-Theft Alarm System Trigger, Function
- with CODE (551) Anti-theft alarm system (ATA [EDW])
Function requirements, general
^ ATA activated
Anti-theft alarm system alarm triggering, general
If one of the alarm inputs of the activated anti-theft alarm system (ATA) changes from the 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 15.5 V. If the voltage drops below U ≤8.5 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 door, engine hood, trunk lid (model 204.0) or liftgate (model 204.2/9)
^ Function sequence for alarm actuation by changing vehicle inclination (with code (882) Interior monitoring (only with ATA) without code (460) Canada version, without code (494) USA version and 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 resulting from communication loss to alarm siren (H3/1) (up to 31.5.10 and as of 1.6.10 without code (494) USA version)
^ Function sequence for alarm actuation by emergency opening (on model 204.0 with code (494) USA version)
^ Function sequence for alarm output
^ Function sequence for alarm interruption
Function sequence for alarm actuation by opening door, engine hood, trunk lid (model 204.0) or liftgate (model 204.2/9)
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 front door rotary tumbler switch (A85s1)
- Right front door rotary tumbler switch (A85/1s1)
- Left rear door rotary tumbler switch (A85/3s1)
- Right rear door rotary tumbler switch (A85/4s1)
- Trunk lid rotary tumbler switch (M14/7s1) (model 204.0)
- Liftgate rotary tumbler switch (M14/7s1) (model 204.2/9)
- Engine hood antitheft alarm switch (S62)
The status of the left front door rotary tumbler switch is transmitted by the left front door control unit (N69/1) to the rear SAM control unit via the interior CAN (CAN B). The status of the right front door rotary tumbler switch is transmitted by the right front door control unit (N69/2) to the rear SAM control unit via the interior CAN. The remaining switches are read in directly by the rear SAM control unit.
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.
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 actuation by changing vehicle inclination (with code (882) Interior monitoring (only with ATA) without code (460) Canada version, without code (494) USA version and without code (498) Japan version)
^ Tow-away protection not deactivated
Function sequence for alarm actuation by changing vehicle inclination (with code (882) Interior monitoring (only with ATA))
If the inclination sensor integrated into the interior protection and tow-away protection control unit (N26/6) (with code (882) Interior monitoring (only with ATA)) recognizes an alarm-relevant inclination motion, an alarm is output. The corresponding signal is relayed to the rear SAM control unit via the rear SAM-LIN (LIN B4).
Actuation criterion:
Change in vehicle inclination (horizontal axis) 1° up to - 1°, ±0.2°
Alarm is triggered before a wheel looses ground contact when lifting the vehicle.
Additional function requirements for alarm actuation by interior monitoring (with code (882) Interior monitoring (only with ATA))
^ Interior protection not deactivated
Function sequence for alarm triggering by motion in interior compartment (with code (882) Interior monitoring (only with ATA))
The status of the interior protection and tow-away protection control unit is read in by the rear SAM control unit via the rear SAM-LIN. If a movement in the vehicle interior is recognized and considered to be alarm-relevant, an alarm is output.
On model 204.2/9 the left rear glass breakage sensor (B39), right rear glass breakage sensor (B39/1) and rear window glass breakage sensor (B39/4) also transmit a signal to the rear SAM control unit, which triggers an acoustic and visual alarm.
On vehicles with tilting/sliding roof (SR) (with code (414) Power glass tilting/sliding sunroof ) or panoramic roof (with code (413) Panoramic glass sunroof with top sliding sunroof), the interior compartment is not monitored during active rain closing. After closing or after expiration of t = 35 s, the interior protection is reactivated.
Function sequence for alarm actuation resulting from communication loss to alarm siren () (up to 31.5.10 and as of 1.6.10 without code (494) USA version)
The alarm siren is actuated cyclically approx. every t = 700 ms by the rear SAM control unit with 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 alarm actuation by emergency opening (on model 204.0 with code (494) USA version)
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 status of the trunk lid emergency opening switch is read in and evaluated by the rear SAM control unit. The ATA triggers an alarm when the trunk lid emergency opening switch is actuated.
Function sequence for alarm output
The following components of the exterior lights are actuated:
- From front SAM control unit with fuse and relay module (N10/1):
- Left front turn signal lamp (E1e5)
- Right front turn signal lights (E2e5)
- By the rear SAM control unit:
- Left rear turn signal lights (E3e1)
- Right rear turn signal lights (E4e1)
- By the left front door control unit:
- Left outside mirror turn signal lamp (E6/5)
- By the right front door control unit:
- Right outside mirror turn signal lamp (E6/6)
- From the instrument cluster (A1):
- Left turn signal indicator lamp (A1e1)
- Right turn signal indicator lamp (A1e2)
The acoustic alarm is output up to 31.5.10 and as of 1.6.10 without code (494) USA version via the alarm siren and as of 1.6.10 with code (494) USA version via the left horn (H2) and right horn (H2/1). The alarm siren is actuated by the SAM control unit via the rear SAM-LIN.
The horns are actuated by the rear SAM control unit and horn relays (N10/1kO). The interior lights are switched on by the front SAM control unit.
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 c. 15C (valid transmitter key inserted into electronic ignition switch control unit (N73))
The electronic ignition switch control unit transmits the corresponding signal with interior CAN to the rear control unit, which then terminates the activated alarm.
