Interior Lamps; Daytime Running Lamps - GMC 1999 Suburban Owner's Manual

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Headlamps-On Reminder
A buzzer will sound when your headlamps are turned on
and your ignition is in OFF, LOCK or ACCESSORY. If
you need to use your headlamps when the ignition
switch is in OFF, LOCK or ACCESSORY, the buzzer
can be turned off by turning the thumbwheel next to the
parking and headlamp switch all the way down.

Daytime Running Lamps

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.
The DRL system will make your headlamps come on at
a reduced brightness when:
D
the ignition is on,
D
the headlamp switch is off and
D
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.
Your instrument panel won't be lit up either.
When it begins to get dark, your DRL indicator light
is a reminder to turn your headlamp switch on. The
other lamps that come on with your headlamps will also
come on.
When you turn the headlamp switch off, the regular
lamps will go off, and your headlamps will change to
the reduced brightness of DRL.
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.

Interior Lamps

Instrument Panel Intensity Control
The instrument panel intensity control is located next to
the parking/headlamp switch. Rotate the thumbwheel up to
adjust the instrument panel lights. Rotate the thumbwheel
up to the first notch to return the radio display and gear
shift indicator LED display to full intensity when the
headlamps or parking lamps are on. To turn on the dome
lamps (with the vehicle doors closed) rotate the
thumbwheel up to the second notch position.
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