GF80.50-P-2002RI Activate Anti-Theft Alarm System, Function

GF80.50-P-2002RI Activate Anti-Theft Alarm System, Function

General function requirements
^ C. 15C OFF

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. Actuation of the ATA is indicated by a flashing function indicator in the inside CL close switch and ATA function indicator (S6/5s3).

On vehicles for Belgium, the ATA even arms when the vehicle is not locked with the CL.

It is possible to switch off the tow-away protection on vehicles with code (882) Interior monitoring (only with ATA) the interior protection feature 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 (with code (882) Interior monitoring (only with ATA))
^ Function sequence for activating alarm inputs
^ Function sequence for convenience feature

Function sequence for activating ATA
Activation of the ATA comprises the following subfunctions:
^ Function sequence for locking with transmitter key (A8/1)
^ Function sequence for locking CL with automatic relocking feature
^ 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 driver-side SAM control unit (N10/10) 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 via the right antenna amplifier module (A2/65) to the overhead control panel control unit (N70). This relays the signal to the EIS control unit (N73) via interior CAN. Parallel to the radio signal, an infrared signal is transmitted to the left front IR receiver (A26/1) or right front IR receiver (A26/2) (precise aiming required).
The corresponding signal is read in by the left door control unit (N69/1) or right door control unit (N69/2) and is 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 vehicle is locked with the CL.
The driver-side SAM control unit activates the ATA.

Function sequence for locking CL with automatic relocking feature
Relocking is controlled by the pneumatic controller unit with combined functions (A37). If the vehicle is unlocked and neither a door nor the trunk lid is opened within 40 s, the vehicle relocks automatically. Feedback is not output via the exterior lights. The driver-side SAM control unit reacts to pneumatic controller unit relocking by activating the ATA. The interior protection and the tow-away protection are set to the same state as before the last unlocking procedure.

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 t = 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
Actuation of the TS [AS] OFF switch (N72s22) is read in by the lower control panel control unit (N72). The request is transmitted to the driver-side SAM control unit via interior CAN. It deactivates the tow-away protection for the following activation of the ATA.
Deselection of the tow-away protection is confirmed by the function indicator in the TS [AS] OFF switch coming on for approx. t = 2 s after releasing the TS [AS] OFF switch (beta)

Additional function requirements for switching off interior protection of ATA
^ ATA not yet activated

Function sequence for switching off interior protection of ATA
Actuation of the IRS OFF switch (N72s21) is read in by the lower control panel control unit. The request is transmitted to the driver- side SAM control unit via interior CAN. It deactivates the interior protection for the following activation of the ATA. Selection is confirmed by the function indicator flashing in the IRS OFF switch for approx. t = 2 s at f = 6.25 Hz (t = 80 ms ON, t = 80 ms OFF).

Additional function requirements for activating alarm inputs
^ ATA activated

Function sequence for activating alarm inputs
Activation of alarm inputs comprises the following partial functions:
^ Function sequence for monitoring switch
^ Function sequence for activating tow-away protection
^ Function sequence for activating interior protection (with code (882) Interior monitoring (only with ATA))
^ Function sequence for activating alarm signal horn (H3)

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 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)

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 ATA inclination sensor (B33) 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 s, for this reason an alarm can only be triggered t = 25 s at the earliest after arming.
The ATA inclination sensor communicates with the driver-side SAM control unit via the rear SAM control unit (N10/8). 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 ATA inclination sensor.
If the vehicle ATA 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, the center stowage compartment or the trunk is closed.

The interior protection transmitter/receiver unit (A26/14) is ready for an alarm after an additional t = 10 s because it is necessary to calibrate to the vehicle interior. If a movement in the vehicle interior is recognized and considered to be alarm-relevant, an alarm is output. An alarm is transmitted via the serial interface of the interior protection transmitter/receiver unit to the rear SAM control unit. The interior protection transmitter/receiver unit can serve as an alarm source only when it has been recognized that it is functioning properly.

The status of the interior protection transmitter/receiver unit is fed back for each communication cycle transmitted from the rear SAM control unit to the interior protection transmitter/receiver unit.

The interior protection can also be activated when the Vario roof is open. This function can be set in the menu of the instrument cluster (A1).
On vehicles for the Netherlands, the interior protection is activated regardless of the status of the Vario roof if not deactivated previously via the IRS OFF switch.

The interior protection transmitter and receiver is installed in the cover in the center stowage compartment. If the cover in the center stowage compartment is not closed correctly when the interior protection is activated, the interior protection transmitter and receiver cannot fulfill its function. The interior protection is not activated. The rear SAM control module recognizes this status via the center console stowage compartment ATA switch and transmits this information to the driver-side SAM control module via CAN B.

It transmits the information to the instrument cluster via interior CAN. An appropriate warning message appears in the instrument cluster.

Function sequence for activating alarm signal horn
The alarm signal horn is armed together with the ATA and checked cyclically approx. every t = 1 s by the driver-side SAM control unit.

Visual feedback:
The function indicator in the inside CL close switch and ATA function indicator comes on momentarily approx.once each second.

Acoustic feedback:
On vehicles for the Netherlands, with code (494) USA version or with code (460) Canada version, a buzzer signal is generated (triple beep sound). The buzzer signals have various sounds. If one door is not properly closed during ATA [EDW] activation, no feedback will be given.

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 driver- side SAM control unit, which then activates the ATA.

Function sequence for convenience feature
The convenience feature comprises the following partial functions:
^ Function sequence for remote trunk release
^ Function sequence for closing windows and Vario roof
^ Function sequence for convenience feature (with code (889) Keyless Go)

Function sequence for remote trunk release
The remote trunk lid release is a convenience function allowing the driver to open the trunk lid with the transmitter key.
The trunk lid is also an alarm input and this function must also be available when the vehicle (ATA armed) is locked.
Therefore it is necessary that the ATA support this trunk function in a manner not generating an alarm and reset the ATA to its original state after completing the remote trunk unlocking function.
For this purpose the driver-side SAM control unit causes the rear SAM control unit to disarm the interior protection and tow-away protection alarm inputs and pneumatic controller unit with combined functions to disarm the trunk lid contact alarm input.

All other components remain armed, i.e. in status ready for alarm. After completing the function, the ATA is reset to the original state. The trunk lid, for example, is closed manually after the remote trunk release function.

The rear SAM control unit recognizes the contact position of the locking pawl rotary tumbler switch and relays this information to the driver-side SAM control unit via interior CAN.

After the trunk lid is closed for t = 10 s, the locking pawl rotary tumbler switches, the interior protection and the tow-away protection are reactivated and set to the same state as before the remote trunk release operation.

Function sequence for closing windows and Vario roof
The central locking is a convenience function allowing the driver to close the windows and the Vario roof with the transmitter key.

When this convenience function is activated, the ATA can already be in the arming phase or is already armed. It is necessary to deactivate the interior protection for the duration of the convenience function so that the movements of the windows and the Vario roof do not cause erroneous alarms. If all windows and the Vario roof are closed, the interior protection is rearmed.

Function sequence for convenience feature
The comfort function is initiated by the EIS control unit. As soon as the driver-side SAM control unit receives the "Closing" comfort message via the interior CAN, it deactivates the interior protection. The remaining ATA components remain armed and ready for alarm.

The interior protection alarm input is rearmed after completion of the comfort function and a waiting time of 10 s, or is set to the same state as before the comfort function locking.

The waiting time of t = 10 s is intended to prevent the interior protection from being armed too early as a result of an interrupted and restarted comfort function making it necessary to disarm it again.
If the comfort function is interrupted and not continued within t = 35 s, the interior protection transmitter/receiver unit is rearmed.