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:

Seat belts
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Features
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How to use the STATUS button
The STATUS button is used to display system information. Three different split screens of information are available. Press the STATUS button multiple times to cycle through these screens as follows: ...