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Failure of the component

If the communication to the ASD control unit fails, run the standard tests (global testing procedure). If there is an internal control unit fault, the following behavior is to be expected:

NOTE: At every engine start (pure electrical driving mode or driving mode with combustion engine), the ASD control unit checks whether all speakers, including acoustic sensors, are connected. If a speaker is detected as disconnected, the ASD control unit switches the ASD function off completely. Not until all speakers are detected as connected does the ASD control unit release the ASD function.

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