GF80.50-P-2002CW Activate Anti-Theft Alarm System, Function
GF80.50-P-2002CW Activate Anti-Theft Alarm System, Function
- with CODE (551) Anti-theft alarm system (ATA [EDW])
Function requirements
^ Circuit 15C Off
^ Central locking (CL) functioning properly
General
The anti-theft alarm (ATA) is activated automatically when the vehicle is locked using CL. Then the individual alarm inputs are monitored. The activated ATA is indicated by the anti-theft alarm indicator lamp (S6/1e2) flashing continuously.
In (B) the ATA also arms even when the vehicle is not locked with the CL.
It is possible to switch off the tow-away protection (not United States Of America, Canada and Japan ) or on vehicles with code (882) Interior monitoring (only with ATA) the interior protection feature before locking with the CL.
Function sequence for activating ATA, general
Activation of the ATA comprises several partial functions. These are:
^ Activate ATA
^ Switching off ATA tow-away protection
^ Switching off ATA interior protection
^ Activating alarm inputs
Activate ATA
The ATA can be activated by the following function sequences:
^ Locking CL with transmitter key (A8/1)
^ Locking CL with automatic relocking
^ Locking CL with keyless go (with code (889) Keyless Go)
^ Self- activation (only (B))
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 is actuated, it transmits a radio signal to the rear SAM control unit with the FM, AM and CL antenna amplifier (A2/18). This relays the signal to the electronic ignition switch control unit (N73) with interior CAN.
Parallel to the radio signal, an infrared signal is transmitted to the driver front door infrared remote control receiver (A26/1) by the transmitter key (precise aiming required).
This signal is read in by the left front door control unit (N69/1) and transmitted to the electronic ignition switch control unit with interior CAN.
The access authorization for the transmitter key is checked in both cases by the electronic ignition switch control unit.
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:
The automatic relocking function is actuated by the electronic ignition lock 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 electronic ignition switch control unit transmits with 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 is given in the separate Keyless Go function description.
After locking the CL, the electronic ignition switch control unit transmits the message "Vehicle locked" with 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 electronic ignition lock 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.
Switching off tow-away protection of ATA
Additional function requirements
^ ATA not yet activated
Function sequence for switching off tow-away protection
The status of the tow-away protection switch (N70s9) (with code (414) Power glass tilting/sliding roof) or the tow-away protection switch (N70/3s9) (without code (414) Power glass tilting/sliding roof), is read in by the interior protection and tow-away protection control unit (N26/6) and transmitted to the rear SAM control unit with SAM LIN. The rear SAM control unit deactivates the interio protection for the next activation of the ATA.
Deselection of the tow-away protection is confirmed by an LED flashing for approx. t = 2 s in the tow-away protection switch after releasing.
Switching off ATA interior protection
Additional function requirements
^ ATA not yet activated
Function sequence for switching off interior protection
The status of the interior protection switch (N70s8) (with code (414) Power glass tilting/sliding roof) or the interior protection switch (N70/3s8) (without code (414) Power glass tilting/sliding roof), is read in by the interior protection and tow-away protection control unit and transmitted to the rear SAM control unit with SAM LIN. The rear SAM control unit deactivates the interior protection for the next time the ATA is activated.
Deselection of the interior protection is confirmed by an LED flashing in the interior protection switch at f = 6.25 Hz (t = 80 ms ON, t = 80 ms OFF) for approx. t = 2 s.
Activating alarm inputs
Function requirements:
^ ATA activated
Activation of alarm inputs comprises several partial functions. These are:
^ Monitoring switch
^ Activating tow-away protection
^ Activating interior protection
^ Activating alarm siren (H3/1)
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 trunk lid is closed only after the vehicle has been locked, are also armed t = 10 s after closing.
Monitored switches:
^ 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)
^ Engine hood anti-theft alarm switch (S62)
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 electronic ignition switch control unit and after closing the last door and trunk lid.
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 t = 10 to 15 s, for this reason an alarm can only be triggered t = 30 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 an alarm only after another t = 20 s, because it is first necessary to calibrate the interior protection and tow-away protection control unit to match the vehicle interior.
The status of the interior protection control unit and the tow-away protection 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 electronic ignition lock control unit).
The electronic ignition switch control unit transmits the corresponding signal with interior CAN to the rear control unit, which then activates the ATA.
