| In the event of a fault (communication with main beam assist control unit -J844- not possible, view of CMOS camera blocked or main beam assist control unit -J844- defective), the driver is warned as follows: |
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| A warning tone sounds once when the fault occurs (main beam assist active or being activated). The warning tone sounds again if the ignition is switched off and on again and the main beam assist is re-activated. |
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| A driver message appears in the instrument cluster. |
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