Subaru 2002 Forester Owner's Manual page 139

B Outside mirror defogger (if equipped)
CAUTION
To prevent the battery from being discharged, do not operate the
defogger continuously for any longer than necessary.
The outside mirror defogger shares the switch with rear window
defogger.
The outside mirror defogger operates only when the ignition switch is
in the "ON" position.
To turn on the outside mirror defogger, push the switch. To turn it off,
push the switch again.
The indicator light located on the switch is on while the outside mirror
defogger is operation. The defogger will automatically shut off after
about 15 minutes. If the mirror clears before that time, push the switch
to turn it off. It also turns off when the ignition switch is turned to the
"ACC" or "LOCK" position. If defrosting or defogging is desired when
you restart your vehicle, you have to push the switch to turn it on
again.
NOTE
While the outside mirror defogger is operating, the rear window
defogger also operates
Indicator light
HS0063
Instruments and controls
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