GM Service Manual Online
For 1990-2009 cars only

Object Number: 871046  Size: A2

Your exterior lamps knob is located on your instrument panel to the left of the steering wheel.

(Off):  Turn the knob to this symbol and release it to turn off the Daytime Running Lamps (DRL) and the automatic headlamps. An indicator will illuminate when the position is selected. This position is not available for vehicles first sold in Canada.

(Automatic DRL/AHS):  Turning the knob to this symbol puts the system into automatic headlamp mode. An indicator will illuminate when the position is selected.

(Parking Lamps):  Turn the knob to this symbol to manually turn on the following:

    • Parking Lamps
    • Sidemarker Lamps
    • Taillamps
    • License Plate Lamps
    • Instrument Panel Lights
&(Headlamps):  Turn the knob to this symbol to turn on all the lamps listed as well as the headlamps.

Automatic Headlamp System

When it is dark enough outside, your Automatic Headlamp System will turn on your headlamps at the normal brightness along with other lamps such as the taillamps, sidemarker, parking lamps and the instrument panel lights. The radio lights will also be on.

Your vehicle is equipped with a light sensor on the top of the instrument panel. Be sure it is not covered or the system will be on whenever the ignition is on.

The system may also turn on your lights 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 Daytime Running Lamps (DRL) and the automatic headlamp systems, so that driving under bridges or bright overhead street lights does not affect the system. The DRL and automatic headlamp system will only be affected when the light sensor sees a change in lighting lasting longer than the delay.

If you start your vehicle in a dark garage, the automatic headlamp system will come on immediately. Once you leave the garage, it will take about one minute for the automatic headlamp system to change to DRL if it is light outside. During that delay, your instrument panel cluster may not be as bright as usual. Make sure your instrument panel brightness control is in the full bright position.

To idle your vehicle with the automatic headlamp system off, set the parking brake while the ignition is off. Then start your vehicle. The automatic headlamp system will stay off until you release the parking brake, shift out of park or turn the exterior lamp control to the off position as described in "Exterior Lamps" listed previously.

Lamps On Reminder

A reminder tone will sound when your headlamps or parking lamps are manually turned on, the driver's door is open and your ignition is in LOCK or ACCESSORY. To turn the tone off, turn the knob all the way counterclockwise. In the automatic mode, the headlamps turn off once the ignition key is in LOCK.

Daytime Running Lamps (DRL)

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.

The DRL system will make your headlamps come on at reduced brightness when the following conditions are met:

    • The ignition is on
    • the exterior lamps knob is in automatic headlamp mode
    • the light sensor detects daytime light
    • the transmission is not in PARK (P)

When the DRL are on, only your headlamps will be on. The taillamps, sidemarker and other lamps won't be on. The instrument panel won't be lit up either.

When it begins to get dark, the headlamps will automatically switch from DRL to the regular headlamps.

Fog Lamps

Your vehicle may have this feature. Use your fog lamps for better vision in foggy or misty conditions. Your ignition must be in RUN for your fog lamps to work.


Object Number: 806321  Size: A2

The fog lamp button is located on the instrument panel to the right of the exterior lamps knob.

Press the button to turn the fog lamps on. Press the button again to turn them off. A light will glow near the button while the fog lamps are on. Fog lamps will turn off whenever your high-beam headlamps are on.