See also:

Command List
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Active Noise Control (ANC)
By identifying undesirable sounds in the cabin and then playing back through the speakers sound waves of opposite phase, the original noises are cancelled out, making the M's interior a quieter, m ...

Windshield deicer (if so equipped)
The windshield deicer switch (rear window and outside mirror defroster switch) operates when the ignition switch is in the ON position. The deicer is used to remove ice from the windshield w ...