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:

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 ...

Volume and Beeps settings (models with navigation system)
Volume and Beeps settings (models with navigation system) The display as illustrated will appear when pushing the SETTING button, selecting the “Volume & Beeps” key. Audio Volume: To increase ...

Selecting the vehicle-to-vehicle distance control mode
To choose the vehicle-to-vehicle distance control mode 1 , quickly push and release the CRUISE ON/OFF switch A . ...