Global Machinery Company Sierra 1999 - Manual (Page 125)

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To idle an automatic transmission equipped vehicle with
the DRL off, set the parking brake. Shifting the
transmission into PARK (P) will also allow you to idle
the vehicle with the DRL off. The DRL will stay off
until you release the parking brake or shift the
transmission out of PARK (P).
To idle a manual transmission equipped 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.
Fog Lamps (If Equipped)
If you have fog lamps, use them for better vision in
foggy or misty conditions. Your parking lamps and/or
low
- beam headlamps must be on for your fog lamps
to work.
The fog lamp switch is on
the left side of your
instrument panel.
Press the switch to turn the fog lamps on. Press the
switch again to turn them off. An indicator light will
glow in the switch when the fog lamps are on.
Remember, fog lamps alone will not give off as much
light as your headlamps. Never use your fog lamps in
the dark without turning on your headlamps.
The 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.