Oldsmobile 2003 Silhouette Owner's Manual page 173

Fog Lamps
Your vehicle may have fog
lamps. If
it does, the fog
lamps switch is located in
the instrument panel
switchbank. Press the fog
lamp symbol on the switch
to turn on the lamps.
The indicator light will be lit when the fog lamps are on.
Press the top part of the switch to turn them off.
The indicator light will go off.
When your DRL are on, the exterior lamps control must
first be turned from the off position before the fog
lamps can be turned on.
Your parking lamps or headlamps must be on for your
fog lamps to turn on.
At night, when the light sensor automatically turns on
your headlamps, the fog lamps can be turned on when
the exterior lamps control is in any position.
Your fog lamps will go off when you switch to high
beams. Using your high beams in fog is not
recommended.
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