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GMC 1998 Sonoma Owner's Manual page 105

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The DRL system will make your headlamps come on
at reduced brightness when:
e the ignition is on,
the headlamp switch is i n automatic headlamp
mode and
e
the parking brake is released.
When the DRL are on, only your headlamps will be on.
The taillamps, sidemarker and other lamps won't be on.
The instrument panel won't be lit up either.
When
it
begins to get dark, the headlamps will
automatically switch from DRL to the regular headlamps.
When you turn the headlamp switch off, the regular
lamps will go off, and your headlamps will change
to the reduced brightness of DRL provided it is not
dark outside.
To idle your vehicle with the DRL off, set the parking
brake. 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 (If Equipped)
Use your fog lamps for better vision in foggy or misty
conditions. Your parking lamps or low-beam headlamps
must be on for your fog lamps to work.
The fog lamp switch is on the instrument panel under
the lamps switch. Press the switch to turn the fog lamps
on. Press the switch again to turn them off.
A
light will
glow in the switch when the fog lamps are on.
Remember, fog lamps alone will not give off as much
light as your headlamps. Never use your fog lamps in
the dark without turning on your headlamps.
The fog lamps will go off whenever your high-beam
headlamps come on. When the high-beam headlamps
go off, the fog lamps will come on again.
Interior Lamps
Brightness Control
Turn the switch next to the headlamp switch up to make
your instrument panel lights brighter. Turn the switch all
the way up to turn on the interior lamps.
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