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Alarm Output
If an alarm criterion is fulfilled with the Anti-theft alarm system armed, the alarm is output
(triggered) audibly and/or visually corresponding to the country-specific coding.
Audible Alarm
The emergency current siren receives a signal via the DWA bus when the anti-theft alarm
system in the ultrasonic passenger compartment protection system triggers an alarm.
The emergency current siren confirms receipt of the alarm request and triggers the audi-
ble alarm.
If the alarm request is not confirmed, the Anti-theft alarm system will repeat the alarm
request up to eight times.
Corresponding to the country-specific coding of the emergency current siren, an intermit-
tent or interval tone is generated. The audible alarm is interrupted immediately and with-
out feedback when the anti-theft alarm system is disarmed.
Visual Alarm
Depending on the country-specific version, the following components of the outer light-
ing system can be activated for the visual alarm:
• Direction indicator lights
• Low beam headlight
• High beam headlight
When the anti-theft alarm system triggers an audible alarm, a visual alarm is simultane-
ously triggered for 5 minutes. The anti-theft alarm systems sends the "flash" request via
the K-CAN to the FRM. In turn, the FRM activates the components of the exterior light-
ing system. The visual alarm cannot be extended by repeated alarm triggering.
The visible alarm is terminated immediately and without feedback when the anti-theft
alarm system is disarmed.
Self- Contained/Integrated Alarm
The emergency current cycle triggers the self contained/integrated alarm if its lines are
tampered with. If the DWA bus is also cut through, the USIS detects this situation by the
absence of the reply from the emergency current siren. In turn, USIS triggers the visual
alarm.
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E90 General Vehicle Electrical
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