Buick 2003 Century Owner's Manual page 121

Daytime Running Lamps/Automatic
Headlamp System
Daytime Running Lamps (DRL) can make it easier for
others to see the front of your vehicle during the
day. DRL can be helpful in many different driving
conditions, but they can be especially helpful in the short
periods after dawn and before sunset. Fully functional
daytime running lamps are required on all vehicles
first sold in Canada.
A light sensor on top of the instrument panel makes the
DRL work, so be sure it isn't covered.
The DRL system will make your front turn signal lamps
come on when the following conditions are met:
The ignition is on,
the exterior lamps control is off and
the parking brake is released.
When the DRL are on, only your front turn signal lamps
will be on. The headlamps, taillamps, sidemarker and
other lamps won't be on. Your instrument panel won't be
lit up either.
When it's dark enough outside, your front turn signal
lamps will turn off and your vehicle's 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
off and your front turn signal lamps will come on.
To idle your vehicle with the DRL and automatic
headlamp control off, set the parking brake while the
ignition is in OFF or LOCK. Then start your vehicle. The
DRL, headlamps and parking lamps will stay off until
you release the parking brake.
To turn off the automatic headlamp feature when it's
dark outside, move the exterior lamps control to
the parking lamp position. Your parking lamps will
remain illuminated and your headlamps will turn off.
As with any vehicle, you should turn on the regular
headlamp system when you need it.
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