The rear window defogger clears fog from the rear window.
The ignition must be switched ON to use the defogger.
Press the switch to turn on the rear window defogger. The rear window defogger operates for about 15 minutes and then turns off automatically.
The indicator light illuminates when the defogger is operating.
To turn off the rear window defogger before the 15 minutes has elapsed, press the switch again.

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Indicator light
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This defogger is not designed for melting snow. If there is an accumulation of snow on the rear window, remove it before using the defogger.
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The rear window defogger operation time can be changed from 15 minutes to continuous operation. When the operation time has been switched to continuous operation, by pressing the switch, the rear window defogger will continue to operate until the ignition is switched OFF.
Refer to the Settings section in the Mazda Connect Owner's Manual.