GF80.50-P-2002GM Activate Anti-Theft Alarm System, Function
GF80.50-P-2002GM 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 ATA is activated automatically when the vehicle is locked using the central locking (CL) function. Then the individual alarm inputs are monitored. The activated ATA is indicated by the ATA function indicator (N72/1e2) permanently flashing in the upper control panel control unit (N72/1).
On vehicles for Belgium, the ATA arms automatically without locking the vehicle with the CL.
On vehicles without code (494) USA version, without code (460) Canada version or without code (498) Japan version it is possible to switch off the tow-way protection before locking with the CL. On vehicles with code (882) Interior monitoring (only with ATA) the interior monitoring can be switched off before locking with the CL.
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
Activation of the ATA comprises several subfunctions:
^ 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 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 (N10/8) 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 is actuated, it transmits a radio signal to the rear SAM control unit via the roof antenna module (A2/93). This relays the signal to the EIS control unit (N73) via interior CAN. An infrared signal is transmitted to the left front IR receiver (A26/1) parallel to the radio signal (precise aiming required).
This signal is read in by the left front door control unit (N69/1) and transmitted to the EIS control unit via 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 via the interior CAN to the rear 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 tailgate is opened within 40 s, the vehicle relocks automatically. The EIS control unit transmits the message "Vehicle locked" via the interior CAN 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 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 tailgate is opened and closed again, the ATA is activated automatically 2 s after the last door or the tailgate is closed, regardless of the status of the vehicle central locking. The tow-away protection or interior protection (with code (882) Interior monitoring (only with ATA)) is switched to the same status as before opening.
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-away protection can be switched off only for the next activation of the ATA. This is practical in the following cases:
- when car is transported by rail or truck
- on car ferry
- when parking in a hoisting garage
The tow-way protection can be deactivated using a control menu in the instrument cluster (A1). The signals from the instrument cluster are transmitted to the rear SAM control unit via the interior CAN. It deactivates the tow-away protection for the following activation of the ATA.
Deselection of the tow-away protection is confirmed by a corresponding message on the instrument cluster.
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 function can be switched off for the next activation of the ATA. The interior protection is deactivated via a control menu in the instrument cluster. The signals from the instrument cluster are transmitted to the rear SAM control unit via the interior CAN. It deactivates the interior protection for the following activation of the ATA.
Deselection of the interior protection is confirmed by a corresponding message on the instrument cluster.
Additional function requirements for activating alarm inputs
^ ATA activated
Function sequence for activating alarm inputs
The function sequence for activating alarm inputs comprises the following subfunctions:
^ Function sequence for monitoring switch
^ Function sequence for activating tow-away protection
^ Function sequence for activating interior protection
Function sequence for monitoring switch
The status of the following switches is checked cyclically every t = 200 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 tailgate is closed only after the vehicle has been locked, are also armed t = 10 s after closing.
Monitored switches:
- Switch in rear-end door locking unit (A72)
- Right front door rotary tumbler microswitch (M14/5s1)
- Left front door rotary tumbler microswitch (M14/6s1)
- Left rear door rotary tumbler microswitch (M14/8s1)
- Right rear door rotary tumbler microswitch (M14/9s1)
- Engine hood ATA switch (S62)
- Spare tire carrier lock switch (S151/1) (on model 164 with code (849) Spare tire carrier/spare wheel)
Function sequence for activating tow-away protection
The tow-away protection is activated (if not previously deactivated 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 integrated into the rear SAM control unit determines a reference position, with which the relative vehicle inclination is compared during the activation. Determination of the reference position takes approx. t = 10 s. For this purpose an alarm can be actuated approx. t = 10 s after arming at the earliest.
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. The tow-away protection triggers an alarm before a wheel looses contact to the ground when hoisting.
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 deactivated for the next closing) t = 10 s after the last door or the tailgate is closed.
The interior protection sensor integrated into the overhead control panel control unit (N70) is ready for an alarm only after another t = 20 s, because it is first necessary to calibrate the vehicle interior.
The status of the interior protection sensor is monitored by the overhead control panel 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 DTC memory of the overhead control panel control module.
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 SAM control unit, which then activates the ATA.
