Ford Ranger Owner's Handbook Manual page 56

Climate control
E78544
Press the switch to switch the heated rear
window on. The indicator in the switch will
come on when the heated rear window
is on.
Press the switch again to switch the
heated window off. It will switch off
automatically after a short time.
Heated exterior mirrors
Electric exterior mirrors are fitted with a
heating element that will defrost or demist
the mirror glass. They will switch on
automatically when you switch the heated
rear window on.
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