A8 Sedan V8-3.7L (AEW) (1997)
Ultrasonic Sensor: Description and Operation
CAUTION!
Before working on the electrical system:
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Determine the correct coding for the anti-theft radio.
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Switch the ignition off.
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Disconnect the battery Ground (GND) strap.
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The ultrasonic interior monitoring system detects unauthorized access to the vehicle interior through the windows and activates the anti-theft
alarm.
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The doors are monitored via the contact (illumination) switches.
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The ultrasonic interior monitor control module does not have DTC memory, but self-testing is carried out and the results are displayed by blink
code via the rear fog light switch (LED).
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Interior monitoring can be deactivated using the switch mounted in the B-pillar and it is automatically restored during the next lock activation.