GMC T-Series 1999, Owner'S Manual, Page: 77 / 344

yellow blue
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When the DRL are on, only your low
-
beam headlamps
will be on. The exterior 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 low
-
beam 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.
Marker and Clearance Lamps Switch
(If Equipped)
Your vehicle will have this
switch only if it is designed
to pull a trailer. The switch
is located on the instrument
panel to the right of the
comfort controls. Use the
switch to operate your
clearance and marker lamps.
Your headlamps switch will not operate these lamps.
You can use the switch to manually blink the marker and
clearance lamps by simply turning it on and off.