Infiniti QX: Rear window and outside mirror defroster/windshield deicer (if so equipped) 
switch - Instruments and controls - Infiniti QX Owner's ManualInfiniti QX: Rear window and outside mirror defroster/windshield deicer (if so equipped) switch

Rear window wiper and washer switch
WARNING In freezing temperatures the washer solution may freeze on the rear window glass and obscure your vision. Warm the rear window with the defroster before you wash the rear window. C ...

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:

Switching off the engine
Important safety notes WARNING   Do not turn off the engine before the vehicle has come to a complete stop. With the engine not running, there is no power assistance for the brake and s ...

Glass Replacement
If the windshield or front side glass must be replaced, see your dealer to determine the correct replacement glass. ...

Brakes
If the brakes do not operate properly, have the brakes checked by an INFINITI retailer. ...