Chevrolet 2003 Blazer Owner's Manual page 144

The following does not apply to vehicles sold in Canada.
When necessary, you may turn
off
the automatic
headlamp system and the Daytime Running
Lamps (DRL) feature by following the steps below:
1. Turn the ignition to RUN.
2. Press the DOME OVERRIDE button four times
within six seconds. After the fourth press of the
button, a chime will sound informing you that
the system is
off.
The system will revert back to the
automatic on mode when the ignition is turned to
OFF and then to RUN again.
3. To return to the automatic mode, push the DOME
OVERRIDE button four times within six seconds (a
chime will sound), or turn the ignition to OFF
and then to RUN again.
As with any vehicle, you should turn on the regular
headlamp system when you need it.
Fog Lamps
Your vehicle may be equipped with fog lamps. Use your
fog lamps for better vision in foggy or misty conditions.
Your parking lamps or headlamps must be on for
your fog lamps to work.
The fog lamp button is located on the instrument panel
near the lamp control.
Press the button to turn the fog lamps on. Press the
button again to turn them off. A light will glow in
the button when the fog lamps are on.
Fog lamps will go off whenever your high-beam
headlamps come on. When the high-beams go off, the
fog lamps will come on again.
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