Chevrolet 2003 Monte Carlo Owner's Manual page 130

A light sensor on top of the instrument panel makes the
DRL work, so be sure it isn't covered.
The DRL system's automatic headlamp control will
make your high-beam headlamps come on at a reduced
brightness when the following conditions are met:
The ignition is on,
the exterior lamps control is off and
the gearshift is not in PARK (P).
When the DRL are on, only your high-beam headlamps,
at a reduced level of brightness, will be on. The
headlamps, taillamps, sidemarker and other lamps won't
be on. Your instrument panel and cluster won't be lit
up either.
When it's dark enough outside, your high-beam
headlamps will turn off and the headlamps and parking
lamps will turn on. The other lamps that come on
with your headlamps will also come on.
When it's bright enough outside, your headlamps will go
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Delayed Headlamps
The delayed headlamps feature provides a period of
exterior lighting as you leave the area around your
vehicle. The feature is activated when the headlamps
are on due to the automatic headlamps control
feature later described in this section, and when the
ignition is turned
off.
Your headlamps will then remain on
until the exterior lamps control is moved from OFF to
the parking lamps position or until either a 30 second or
60 second lighting period has ended.
If you turn
off
the ignition with the headlamps switch in
the parking lamps or headlamps position, the delayed
headlamps cycle will not occur.
To disable the delayed headlamps feature or change
the time of delay, see Vehicle Customization Settings
on
page 3-79.
As with any vehicle, you should turn on the regular
headlamps system when you need it.
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