Subaru 2000 Forester Owner's Manual page 165

Interior equipment
CAUTION
Do not hold the lighter pushed in, because it will overheat.
HS0106
The cigarette lighter operates only when the ignition switch is in the
"ON" and "ACC" positions.
To use the cigarette lighter, push in the knob and wait a few moments.
It will automatically spring up when ready for use.
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