GF80.50-P-2002LE Activate Anti-Theft Alarm System, Function
GF80.50-P-2002LE Activate Anti-theft Alarm System, Function
- with CODE (551) Anti-theft alarm system (ATA [EDW])
Function requirements, general
^ C.15C OFF
^ Central locking operating properly
Activate antitheft alarm system (ATA), general
The antitheft alarm system (ATA) is activated automatically when the vehicle is locked with the central locking (CL). Then the individual alarm inputs are monitored. The activated ATA is indicated by the ATA function indicator (N72/1e2) flashing continuously.
On vehicles for Belgium, the ATA arms automatically without locking the vehicle with the CL.
It is possible, before locking the CL, to switch off the tow-away protection (except with code (494) USA version, with code (460) Canada version and with code (498) Japan version) or the interior protection (on vehicles with code (882)Interior monitoring (only with ATA)).
Activation of the ATA comprises several subfunctions:
^ Function sequence for activating ATA
^ Function sequence for switching off tow-away protection of ATA
^ Function sequence for switching off interior protection of ATA
^ Function sequence for activating alarm inputs
Function sequence for activating ATA
The partial function is comprised of the following partial functions:
^ Function sequence for locking with transmitter key (A8/1)
^ Function sequence for locking CL with automatic relocking feature
^ Function sequence for locking CL with Keyless-Go
with code (889) Keyless-Go)
^ Function sequence for automatic activation (only on vehicles for Belgium)
Special case: Driver door
If the driver door is still open when the CL is locked, it is not locked. When the driver door is closed, the door status is indicated to the rear SAM control unit with fuse and relay module (N10/2) and the alarm input is included in the checking cycle. This leads to actuation of an alarm when opening the driver door without previous deactivation of the ATA.
Function sequence for locking CL with transmitter key
When the "Lock" button on the transmitter key (A8/1) is actuated, it transmits a radio signal via the rear window antenna amplifier module (A2/12) to the rear SAM control unit. This relays the signal to the EIS control unit (N73) via interior CAN. Parallel to the radio signal an infrared signal is transmitted by the transmitter key to the driver door (B58) (precise aiming required).
This signal is read in by the left door control unit (N69/1) (model 216) or left front door control unit (N69/1) (model 221) and is transmitted by the EIS control unit via the interior CAN.
In both cases, the EIS control unit checks the access authorization of the transmitter key.
If the access authorization is valid, the message "Vehicle locked" is transmitted with the interior CAN to the SAM control unit, which then activates the ATA.
Function sequence for locking CL with automatic relocking feature
The automatic relocking function is actuated by the EIS control unit. If the vehicle is unlocked and neither a door nor the trunk lid is opened within 40 s, the vehicle relocks automatically. The EIS control unit transmits via interior CAN the message "Vehicle locked" to the rear SAM control unit, which then activates the ATA.
Function sequence for locking CL with Keyless-Go:
Detailed information on the function sequence for locking the CL via Keyless-Go is given in the separate Keyless-Go function description.
After locking the CL, the EIS control unit transmits the message "Vehicle locked" via interior CAN to the rear SAM control unit, which then activates the ATA.
Function sequence for self-activation
When the transmitter key is removed from the EIS control unit, the driver door or the trunk is opened and closed again, the ATA is activated automatically 2 s after the last door or the trunk lid is closed, regardless of the status of the vehicle central locking. The interior protection and the tow-away protection are set to the same state as before the last unlocking procedure.
Additional function requirements for switching off tow-away protection of ATA
^ ATA not yet activated
Function sequence for switching off tow-away protection of ATA
The tow-way protection can be deactivated with the COMAND control unit (A40/3) or by the button for free programming (A40/9s10), if not programmed previously, in the front central operating unit (A40/9). The tow-way protection can be deactivated or activated independently from the selected circuit status. This makes it possible, for example, to deactivate the tow-away protection while driving. Deactivation is only valid for the following activation. It is reset with ignition "ON" (c. 15) or each time the ATA is deactivated.
Additional function requirements for switching off interior protection of ATA
^ ATA not yet activated
Function sequence for switching off interior protection of ATA
The interior protection (with code (882) Interior monitoring (only with ATA)) can be deactivated with the COMAND control unit or the button free for programming, if not programmed previously in the central front control unit. The interior protection can be deactivated or activated independently from the selected circuit status. This makes it possible, for example, to deactivate the interior protection while driving. Deactivation is only valid for the following activation. It is reset with ignition "ON" (c. 15) or each time the ATA is deactivated.
Additional function requirements for activating alarm inputs
^ ATA activated
Function sequence for activating alarm inputs
The partial function is comprised of the following partial functions:
^ Function sequence for monitoring switch
^ Function sequence for activating tow-away protection
^ Function sequence for activating interior protection
^ Function sequence for activating alarm siren (H3/1)
Function sequence for monitoring switch
The status of the following switches is checked cyclically every t = 0,4 ms. If the polls indicate that an input is at rest within t = 10 s, the corresponding input is then armed. Alarm inputs set later to the non-actuated state, e.g. if the trunk lid is closed only after the vehicle has been locked, are also armed t = 10 s after closing.
Monitored switches:
- 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)
- Ultrasonic echo sounder sensor (A26/13) (with code (882) Interior monitoring (with ATA [EDW] only))
- Alarm signal siren (H3/1)
Function sequence for activating tow-away protection
The tow-away protection is activated (if not previously deselected for the next locking operation) t = 10 s after the locking command from the EIS control unit and after closing the last door and tailgate.
The inclination sensor in the alarm siren determines a reference position, with which the relative vehicle inclination is compared during the activation. Determination of the reference position requires approx. t = 10 to 15 to s, for this reason an alarm can only be triggered t = 25 s at the earliest after arming.
The inclination sensor communicates with the rear SAM control unit with rear SAM-LIN.
When the maximum vehicle inclination is exceeded with regard to the reference position, an alarm is triggered.
If the vehicle inclination changes very slowly (e.g. leaky tire), the reference position adapts to the current vehicle position to prevent inadvertent activation of the inclination sensor.
If the vehicle inclination sensor is faulty, all other components of the ATA continue to function properly and the corresponding fault codes are entered in the fault memory in the rear SAM control unit.
Function sequence for activating interior protection
The interior protection is activated (if not previously deselected for the next closing) t = 10 s after the last door or the trunk is closed. The interior protection is ready for alarm after another t = 20 s, because it is first necessary to calibrate the ultrasonic echo sounder sensor to the vehicle interior.
The status of the ultrasonic echo sounder sensor is monitored by the rear SAM control unit. If a defect is detected, the remaining ATA functions are still ensured regardless of this error. The corresponding fault codes are stored in the fault memory in the rear SAM control unit.
Function sequence for activating alarm siren
The alarm siren is armed together with the ATA and checked cyclically approx. every t = 700 ms by the rear SAM control unit with rear SAM-LIN.
Deactivating ATA:
The ATA is deactivated completely by opening the CL with transmitter key with infrared or radio or by switching on circuit 15C (valid transmitter key in EIS control unit). The EIS control unit transmits the corresponding signal via interior CAN to the rear control unit, which then activates the ATA.
