Activating anti-theft alarm, function - GF80.50-P-2002E

MODEL 170 up to 31.5.98 with CODE (551a) Anti-theft alarm system (ATA) 

MODEL 170 up to 31.5.98 with CODE (552a) Anti-theft alarm system (ATA) for Switzerland 

The anti-theft alarm (ATA)  is activated by:

• locking the vehicle with the remote control key  (Infrared up to 5/97, as of 6/97 and radio)
• locking the vehicle with the mechanical key (Lock switch  , , only)

  Signal:  Lock switch 2 (SN2, ground)

Function 

When the vehicle is locked with the remote control key the "lock" signal is transferred to the multi-function control module (N10-3) via the IR DAS control module (N54/1) or radio frequency DAS control module (N54/3). From here the signal is transferred to the pneumatic system equipment control module (A37) via the data bus (CAN).

Following this signal the state of all alarm inputs is checked cyclically (0.5s). If 20 checks in sequence (10s) indicate the non-actuated position, the corresponding alarm input is armed.

The "lock" signal activates the ATA via the PSE control module (A37) and if installed, the anti-towing sensor (TS).

When the vehicle is locked mechanically the signal travels from the lock switches via the IR DAS control module (N54/1) to the multifunction control module (N10-1).

When the ATA is armed the LED in the interior switch (CL) (S6/1s2) flashes or on vehicles with code 882a, the LED in the ATA status/towing protection switch (S85/3)

• The ATA is not armed when the driver's door is open.
• Arming the ATA leads to termination of any alarm tripped previously.
• When the power supply is reconnected the ATA is armed automatically when it was armed before separation of the power.