Activating anti-theft alarm, function

On vehicles with code 882a (infrared interior protection) the interior protection and anti-towing features are activated automatically.

Starter lockout (10/92 up to introduction of standard immobilizer)

The lead for circuit 50 from the ignition/starter switch to the starter is interrupted when the ATA is armed by an additional starter lock-out relay module (K38).

In the activated state the relay is not under power. In the deactivated state it receives power from the ignition/starter switch, circuit 15 and the ATA control module (N26) circuit 31, causing the relay to pull in and making it possible to start the engine.

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

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

 The ATA cannot be activated or deactivated with the interior CL switch (S85).

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

 Locking the vehicle with the remote control key

 Locking the vehicle with the mechanical key (only , and vehicles before 1/94 which have not been disconnected)

Function

When the vehicle is locked with the remote control key the ATA control module (N26) receives a ground signal from the RCL control module (N54). When the vehicle is locked with the mechanical key on model 129 the ATA/CF microswitch for the left front door, right front door, or trunk lid (S86, S87s1, S88s1) connect the ATA control module (N26) to ground.

On models 140 and 202 the ATA control module (N26) receives the ground signal from the lock switches (S86/1, S87/1, S88/2). The left front door actuator (S47) must also switch ground to the ATA control module (N26) within approx. 6s. After an activation time of approx. 15 s the ATA is armed.