Oldsmobile 1999 Alero - Manual (Page 101)

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Automatic Light Control (ALC)
When it is dark enough outside, your Automatic Light
Control (ALC) will turn on your headlamps along with
other lamps such as the taillamps, sidemarker lamps,
park lamps and the instrument panel lights. The radio
lights will also be dim.
Your vehicle is equipped with a light sensor on the top
of the instrument panel under the defroster grill, so be
sure it is not covered. This will cause the ALC system to
be on whenever the ignition is on.
The ALC system may also come on when driving
through a parking garage, heavy overcast weather or a
tunnel. This is normal.
There is a delay in the transition between the daytime
and nighttime operation of the DRL and the ALC
systems so that driving under bridges or bright overhead
street lights does not affect the system. The DRL and
ALC systems will only be affected when the light sensor
sees a change in lighting lasting longer than this delay.
To idle your vehicle with the ALC system off, set the
parking brake while the ignition is off. Then start the
vehicle. The ALC system 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.
Delayed Headlamps
The delayed headlamps feature will continue to
illuminate the headlamps for 20 seconds after the key is
turned to OFF.
To turn off the delayed headlamps feature, turn the turn
signal/multifunction lever up one position and then back
to OFF.
Fog Lamps (If Equipped)
The button for your fog lamps is located on the
instrument panel, to the left of the steering wheel, beside
the instrument panel intensity control.
When using the fog lamps, the ignition must be on as
well as the parking lamps or the low
- beam headlamps.
Push the button to turn the fog lamps on. An indicator
light on the button will glow when the fog lamps are on.
Push the button again to turn the fog lamps off.
The fog lamps will turn off whenever the high - beam
headlamps are turned on. When the high beams are
turned off, the fog lamps will come on again.