GF80.50-P-2002FL Activate Antitheft Alarm System, Function
GF80.50-P-2002FL Activate Antitheft Alarm System, Function
- with CODE (551) Anti-theft alarm system (ATA [EDW])
Function requirements, general
^ Terminal 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 a permanently flashing anti-theft alarm indicator lamp (S6/1e2) in the instrument panel switch group (S6/1).
Before locking the CL, the tow-away protection (with code (882) Interior monitoring (only with ATA)) or interior protection (with code (882) Interior monitoring (only with ATA)) can be deactivated.
Activation of the ATA comprises several subfunctions:
^ Function sequence for activating ATA
^ Function sequence for switching off tow-away protection of ATA (with code (882) Interior monitoring (only with 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 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)
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 1, AM and CL antenna amplifier and KEYLESS-GO (A2/18). This transmits the signal to the electronic ignition lock control unit (N73) via the 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 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 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 the message "Vehicle locked" with interior CAN to the rear SAM control unit with fuse and relay module, which then activates the ATA.
Function sequence for locking CL with Keyless-Go (with code (889) 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.
Additional function requirements for tow-away protection of ATA (with code (882) Interior monitoring (only with ATA))
^ ATA not yet activated
Function sequence for switching off tow-away protect of ATA (with code (882) Interior monitoring (only with ATA))
The signals from the tow-away protection button (N70s9) (with code (414) Power glass tilting/sliding sunroof) or tow-away protection button (N70/3s9) (without code (414) Power glass tilting/ sliding sunroof) are read in by the interior protection and tow-away protection (N26/6) and relayed via the rear SAM-LIN (LIN B4) to the rear SAM control unit. It deactivates the tow-away protection for the following activation of the ATA.
Deselection of the tow-away protection is confirmed by an LED in the tow-away protection button for approx. t = 2 s after releasing the tow-away protection button.
Additional function requirements for switching off interior monitoring of ATA with code (882) Interior monitoring (only with ATA))
^ ATA not yet activated
Function sequence for switching off interior protection of ATA (with code (882) Interior monitoring (only with ATA))
The signals from the interior protection button (N70s8) (with code (414) Power glass tilting/sliding sunroof) or interior protection button (N70/3s8) (without code (414) Power glass tilting/sliding sunroof) are read in by the interior protection and tow-away protection and relayed via the rear SAM-LIN (LIN ) to the rear SAM control unit. It deactivates the interior protection for the following activation of the ATA.
Deselection of the interior protection is confirmed by an LED flashing in the interior protection button at f = 6.25 Hz (t = 80 ms ON, t = 80 ms OFF) for approx. t = 2 s.
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-way protection (with code (882) Interior monitoring (only with ATA))
^ Function sequence for activating interior protection (with code (882) Interior monitoring (only with ATA))
^ Function sequence for activate alarm siren (H3/1) (up to 31.5.10, as of 1.6.10 without code (494) USA version)
Function sequence for monitoring switch
The following listed switches are interrogated in cycles for their condition 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 (model 212.0) or liftgate (model 212.2) 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) in left front door lock (A85)
- Right front door rotary tumbler switch (A85/1s1) in right front door lock (A85/1)
- Left rear door rotary tumbler switch (A85/3s1) in left rear door lock (A85/3)
- Right rear door rotary tumbler switch (A85/4s1) in right rear door lock (A85/4)
- Trunk lid rotary tumbler switch (M14/7s1) (model 212.0) Liftgate rotary tumbler switch (M14/7s1) (model 212.2)
- Engine hood antitheft alarm switch (S62)
The status of the left front door rotary tumbler switch is read in by the left front door control unit and transmitted via the interior CAN. The status of the right front rotary tumbler switch is read in by the left front door control unit (N69/2) and transmitter via the interior CAN. The status of the rear door rotary tumbler switch is read in by the rear SAM control unit.
Function sequence for activating tow-way protection (with code (882) Interior monitoring (only with ATA))
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 (model 212.0) or liftgate (model 212.2). The inclination sensor in the interior protection control unit 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 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 (with code (882) Interior monitoring (only with ATA))
The interior protection is activated (if not previously deselected for the next closing) t = 10 s after the last door and the trunk lid (model 212.0) or the liftgate (model 212.2) 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.
On model 212.2 the following sensors are monitored in addition to the interior protection
- Left rear window glass breakage sensor (B39)
- Right rear window glass breakage sensor (B39/1)
- Rear window glass breakage sensor (B39/4)
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 activate alarm siren () (up to 31.5.10, as of 1.6.10 without code (494) USA version)
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 completely deactivated by unlocking the central locking with the transmitter key via infrared, via two-way radio or by switching on circuit 15C (valid transmitter key inserted 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.
