Rear window and outside mirror defroster/windshield deicer (if so equipped) switch

Rear window and outside mirror defroster/windshield deicer (if so equipped) 
switch  - Instruments and controls - Infiniti QX Owners Manual - Infiniti QX

See also:

Passenger compartment
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Vehicle phonebook
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Manual operation
Fan speed control: Push the fan speed increase “” or decrease “” buttons to manually control the fan speed. Push the “AUTO” button to return to automatic control of the fan speed. Air recirculati ...