MODEL   202 with CODE (551a) Anti-theft alarm (ATA)

The anti-theft alarm (ATA) can be deactivated by: centrally unlocking the vehicle with the remote control key centrally unlocking the vehicle by opening one of the front doors centrally unlocking the vehicle with the lock switches (only , ), inserting the remote control key into the electronic ignition switch (EIS) control module (N73) when the vehicle was unlocked previously with the remote control key. The ATA is not deactivated when the vehicle was unlocked with the central locking interior switch (S6/1) or by the emergency unlocking function.

Function sequence The PSE control module (combined) (A37) receives the signal "unlock vehicle" via the CAN bus and then deactivates all alarm inputs. Moreover, the PSE deactivates the connected alarm devices: Alarm signal siren with additional battery (H3/1) Interior motion sensor (IMS), if connected and activated. The alarm signal siren with additional battery (H3/1) honks once as an acoustic signal when the ATA is deactivated. The deactivated ATA terminates a previously activated alarm.

	Activation of anti-theft alarm (ATA), function		GF80.50-P-2002J
	Alarm triggering, function		GF80.50-P-2004F
	Unlocking by opening a door, function		GF80.20-P-3004A
	Unlocking with remote control key, function		GF80.20-P-3006A
	Unlocking/locking with lock switches, function		GF80.20-P-3007A
	Alarm signal siren, location/purpose/ design/function