A8 Sedan V8-3.7L (AEW) (1997)
Ultrasonic Sensor: Testing and Inspection
Interior Monitoring, Functional Check
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Cover all ultrasonic interior monitoring sensors with masking tape.
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Open all side windows approximately 10 cm (4 inches).
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Lock vehicle, thereby activating anti-theft alarm and interior monitoring systems.
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Wait 30 seconds, until LED in rear fog light switch blinks slowly.
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Extend hand through one window opening and remove tape from interior monitoring sensor.
If interior monitor is working properly, alarm will sound.
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Unlock vehicle to disable alarm.
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Carry out same procedure on each remaining interior monitoring sensor.
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Make sure tape is reapplied to each sensor that has been checked.