Oldsmobile 2001 Silhouette - Manual (Page 158)

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To idle your vehicle with the DRL off, set the parking
brake while the ignition is in OFF or LOCK. Then start
the vehicle. The DRL will stay off until you release the
parking brake.
As with any vehicle, you should turn on the regular
headlamp system when you need it.
Fog Lamps
The fog lamps switch is
located in the instrument
panel switchbank. Push the
fog lamp symbol on the
switch to turn on the lamps.
The indicator light will glow when the fog lamps are on.
Push the top part of the switch to turn them off.
The indicator light will go off.
Your parking lamps or headlamps must be on for your
fog lamps to turn on.
When your DRL are on, the headlamps control must
first be turned from the off position before the fog
lamps can be turned on. At night, when the light sensor
automatically turns on your headlamps, the fog lamps
can be turned on when the headlamps 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.