2015 Nissan Sentra Owner’s Manual — Rear window and outside mirror (if so equipped) defroster switch
Instruments and controls

To defrost the rear window glass and outside mirror (if so equipped), start the engine and push the rear window defroster switch on. The rear window defroster indicator light on the switch comes on. Push the switch again to turn the defroster off.
The rear window defroster automatically turns off after approximately 15 minutes.
CAUTION
When cleaning the inner side of the rear window, be careful not to scratch or damage the rear window defroster.
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