Activate anti-theft alarm system, function

P80.50-2502-09

Function with transmitter key (A8/1)

Shown on model 199.3 with code (494) USA version

A1 Instrument cluster

A2/65 Right antenna amplifier module

A8/1 Transmitter key

A26/1 Left IR receiver unit

A26/2 Right IR receiver unit

B33 ATA [EDW] inclination sensor

E1 Left front headlamp unit

E1e5 Left turn signal lamp

E2 Right front headlamp unit

E2e5 Right turn signal lamp

E3 Left taillamp

E3e1 Left turn signal lamp

E4 Right taillamp

E4e1 Right turn signal lamp

E6/5 Left outside mirror turn signal lamp

S6/5 Hazard warning flasher and CL [ZV] switch group

S6/5s3 'Lock CL [ZV]' interior switch and ATA [EDW] function indicator

S17/3 Left door contact switch and CL [ZV] motor

S17/4 Right door contact switch and CL [ZV] motor

S17/8 Trunk lid rotary tumbler microswitch and trunk lid CL [ZV] motor

S62 ATA [EDW] left engine hood switch

S62/1 ATA [EDW] right engine hood switch

E6/6 Right outside mirror turn signal lamp

H3 Alarm signal horn

N10/8 Rear SAM control unit

N10/10 Left SAM control unit

N10/11 Right SAM control unit

N69/1 Door control module left

N69/2 Door control module right

N70 Overhead control panel control unit

N72 Lower control panel control unit

N73 EIS [EZS] control unit

N93 Central gateway control unit

N134/1 CL [ZV] and air brake control unit (spoiler)

Function requirements

 Circuit 15C OFF (key removed)

 Driver door closed

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

 Centrally locking vehicle with transmitter key (A8/1)

 Relocking function

Arming ATA

The ATA is armed with the "Lock" command from the transmitter key (A8/1). The status of the alarm inputs is checked cyclically (t = 500 ms). If 20 polls in sequence (approx. t = 10 s) indicate the non-actuated state, the corresponding input is armed. Alarm inputs which are later switched to idle status are also armed after a further 20 polls.

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Arming tow-away protection (TS)

The TS is activated t = 10 s after the ATA system is "armed". If one or more doors, the engine hood or the trunk lid is open, the ATA inclination sensor (B33) is activated t = 10 s after the last door (trunk lid, engine hood) is closed.

Arming alarm signal horn (H3)

The alarm signal horn (H3) is operational after "arming" the ATA system. The circuit is switched to the ready state by left SAM control unit (N10/10) transmitting two different arming commands. If the alarm signal horn (H3) is once armed, it is still actuated cyclically by the left SAM control unit (N10/10).

Feedback after successful activation

If the ATA is active, the LED in the hazard warning flasher and CL switch group (S6/5) in the interior CL close switch and the ATA function indicator (S6/5s3) flashes briefly once per second.

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General conditions for ATA

 The ATA is not activated when the driver door is open.

 Activation of the ATA leads to interruption of any alarm triggered previously.

 When the supply voltage is restored, the ATA is automatically reactivated, if it was active before the supply voltage was disconnected.

 The tow-away sensor (TS) can be switched off separately via the TS OFF switch (N72s22).