GM Service Manual Online
For 1990-2009 cars only

Object Number: 1400574  Size: B1

The exterior lamp control is located in the middle of the turn signal/multifunction lever.

(Exterior Lamp Control): Turn the control with this symbol on it to operate the exterior lamps.

The exterior lamp control has four positions:

(Off): Turns off all lamps and automatic lighting features, including Daytime Running Lamps (DRL) and IntelliBeam™. This is a momentary switch that springs back to the AUTO position when released. An AUTOMATIC LIGHTS ON message appears on the DIC when automatic lights are enabled or an AUTOMATIC LIGHTS OFF message appears on the DIC when the automatic lights are disabled.

AUTO (Automatic): Turns the exterior lamps on and off automatically depending upon how much light is outside of the vehicle. The automatic lights may be disabled even if the control is in the AUTO position.

To enable automatic lighting do any of the following:

    • Turn the headlamp control from AUTO to off and release the switch. It returns back to the AUTO position by itself.
    • Turn the headlamp control from the parking lamp position to AUTO.
    • Turn the headlamp control from the headlamp position to AUTO.

To disable automatic lighting do any of the following:

    • Turn the headlamp control from AUTO to off and release the switch. It returns back to the AUTO position by itself.
    • Turn the headlamp control from AUTO to the parking lamp position.
    • Turn the headlamp control from AUTO to the headlamp position.

Disabling automatic lighting disables the automatic headlamp operation, DRL, and IntelliBeam™ High-Beams (if the vehicle has them).

(Parking Lamps): Turns on the parking lamps together with the following:

    • Sidemarker Lamps
    • Taillamps
    • License Plate Lamps
    • Instrument Panel Lights
(Headlamps): Turns on the headlamps, together with the previously listed lamps and lights.

IntelliBeam™ Intelligent High-Beam Headlamp Control System

For vehicles with IntelliBeam, read this entire section before using this feature.

IntelliBeam is an enhancement to the vehicle's headlamp system. It uses a light sensor located on the back of the rearview mirror to turn the high-beam headlamps on and off depending on approaching traffic.

The IntelliBeam system turns the high-beam headlamps on when it is dark enough, there is no other traffic present, and the IntelliBeam system is enabled.

Turning On and Enabling IntelliBeam

AUTO (IntelliBeam On/Off): Press and release the IntelliBeam button on the inside rear view mirror. The indicator on the mirror turns on. Once the system has been turned on, it remains on each time the vehicle is started. Additionally, the IntelliBeam system must be enabled.

To enable the System, turn the exterior lamp control to AUTO, with the turn signal/multifunction lever in its starting position. The High-Beam On Light appears on the instrument panel cluster when the high-beams are on. See Highbeam On Light . The vehicle has variable intensity high-beams. The high-beam indicator on the instrument panel cluster comes on as soon as the high-beams start to come on, and remains on until the high-beams have completely turned off. Vehicles with IntelliBeam quickly turn off the high-beams if the system detects the sudden presence of vehicle lights ahead.

Driving with IntelliBeam

IntelliBeam only activates the high-beams when driving over 20 mph (32 km/h).

The high-beam headlamps remain on, under the control of IntelliBeam, until any of the following situations occur:

    • The system detects an approaching vehicle's headlamps.
    • The system detects a preceding vehicle's taillamps.
    • The outside light is bright enough that high-beam headlamps are not required.
    • The high-beam headlamps are manually turned on or you use the flash-to-pass feature. See Headlamp High/Low-Beam Changer and Flash-to-Pass .
        When either of these conditions occur, the IntelliBeam feature is temporarily disabled until the high-beam stalk is returned to its starting position. If either of these conditions occur and IntelliBeam already has the high-beam headlamps on, the feature is disabled and the light in the mirror turns off.
    • The exterior lamp control is turned to any setting except AUTO.
        When this occurs, IntelliBeam is disabled until the control is turned back to the AUTO position and the AUTOMATIC LIGHTS ON message displays on the DIC.
    • The IntelliBeam system is turned off at the inside rearview mirror.
    • The vehicle's speed drops below 15 mph (24 km/h).

IntelliBeam may not turn off the high-beams if the system cannot detect other vehicle's lamps because of any of the following:

    • The others vehicle's lamp(s) are missing, damaged, obstructed from view, or otherwise undetected.
    • The other vehicle's lamp(s) are covered with dirt, snow and/or road spray.
    • The other vehicle's lamp(s) cannot be detected due to dense exhaust, smoke, fog, snow, road spray, mist, or other airborne obstructions.
    • Your vehicle's windshield is dirty, cracked, or obstructed by something that blocks the view of the IntelliBeam light sensor.
    • Your vehicle's windshield is covered with ice, dirt, haze, or other obstructions.
    • Your vehicle is loaded such that the front end of the vehicle points upward, causing the IntelliBeam sensor to aim high and not detect headlamps and taillamps.
    • You are driving on winding or hilly roads.

You might need to manually disable or cancel the high-beam headlamps by turning the low-beam headlamps on, if any of the above conditions exist.

Disabling and Resetting IntelliBeam at the Rearview Mirror

IntelliBeam can be disabled and reset to the original factory setting by using the controls on the inside rearview mirror.

AUTO (IntelliBeam On/Off): To disable the system, press this button on the inside rearview mirror. The IntelliBeam indicator turns off and does not come back on until the IntelliBeam button is pressed again. When IntelliBeam has turned on the high-beams, pull or push the high-beam stalk. This disables IntelliBeam and the IntelliBeam indicator on the rearview mirror turns off. To re-enable IntelliBeam, press the IntelliBeam button on the mirror. A different sensitivity setting is available for dealer diagnostics. This is done by pushing and holding this button for 20 seconds until the light flashes three times. If you accidentally activate this, the vehicle's setting automatically resets each time the ignition is turned off and then on again; otherwise, refer to the text above for resetting the system.

Cleaning the IntelliBeam Light Sensor


Object Number: 1459946  Size: A2

The light sensor is located on the inside of the vehicle at the back of the rearview mirror.

Clean the light sensor window, periodically, using glass cleaner on a soft cloth. Gently wipe the sensor window. Do not spray glass cleaner directly on the surface of the sensor window.