Infiniti QX: Windshield deicer (if so equipped) - Rear window and outside mirror defroster/windshield deicer (if so equipped) 
switch - Instruments and controls - Infiniti QX Owner's ManualInfiniti QX: 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 when a wiper is frozen to the windshield. When the switch 1 is pushed, the indicator light 2 illuminates and the deicer operates for approximately 15 minutes. The rear window defroster will activate at the same time. After the preset time has passed, the deicer will turn off automatically. To turn off the deicer manually, push the deicer switch again, and the indicator light turns off.

CAUTION
► When operating the deicer continuously, be sure to start the engine. Otherwise, it may cause the battery to discharge.
► When cleaning the inner side of the window, be careful not to scratch or damage the electrical conductors on the surface of the window.

    Rear window and outside mirror defroster
    To defog/defrost the rear window glass and outside mirrors, start the engine and push the switch 1 on. The indicator light 2 will come on. Push the switch again to turn the defroster off. ...

    See also:

    Engine Oil Life System
    The engine oil life system calculates engine oil life based on vehicle use and displays the CHANGE ENGINE OIL SOON message when it is time to change the engine oil and filter. The oil life system ...

    Music Box® (if so equipped)
    The Music Box® audio system can store songs from CD being played. The system has a 9.3 gigabyte (GB) storage capacity. The following CDs can be recorded in the Music Box® audio system. ...

    Rear media settings
    The rear media settings screen allows Limousine Mode to be turned on or off. When Limousine Mode is selected, the rear passengers can control the total cabin audio system via the remote control. ...