Subaru 2004 Baja Owner's Manual page 152

! Outside mirror defogger (if equipped)
To prevent the battery from being discharged,
do not operate the defogger continuously for
any longer than necessary.
The outside mirror defogger operates only when the
ignition switch is in the "ON" or "ACC" position.
1) Indicator light
To turn on the outside mirror defogger, push the
switch while the engine is running.
The indicator light located on the switch will come on
when the outside mirror defogger heater in operation.
To turn it off, push the switch again.
Instruments and controls
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