GM Service Manual Online
For 1990-2009 cars only

Instrument Panel Brightness

This feature controls the brightness of the instrument panel lights.


Object Number: 808477  Size: A2

The knob for this feature is located to the right of the Twilight Sentinel lever.

Press the knob to release it to the outward position.

Turn the knob clockwise to brighten the lights and counterclockwise to dim them. Press the knob to return it to the original storage position.

Interior Lamps Control


Object Number: 810479  Size: A2

The interior lamp lever, located in the overhead console, has three positions: OFF, AUTO and ON.

When the interior lamp lever is in OFF, the lamps are turned off. Only the driver's door controls and ignition switch backlighting functions will operate.

If the lever is in AUTO and a front door is opened, the overhead console light, front hush panel lamps and rear footwell lamps in the door will automatically come on. When the rear door is opened, all the front door lighting and rear overhead lamps will come on.

When the lever is in ON, the courtesy lamps are turned on. Also, all automatic interior lighting functions are terminated.

Entry Lighting

The entry lighting system automatically turns on the courtesy lamps and the backlighting to the door switches and to the exterior lamp control when a door is opened or if you press the remote keyless entry transmitter unlock button. If activated due to the transmitter, the lighting will remain active for about 40 seconds. Since the entry lighting system uses the light sensor, it must be dark outside in order for the courtesy lamps to turn on. The courtesy lamps turn off approximately 25 seconds after the last door is closed. They will dim to off if the ignition key is placed in ON, or immediately deactivate if the power locks are activated.

Parade Dimming

This feature prohibits dimming of the digital displays and backlighting during daylight hours when the key is in the ignition and the headlamps are on. This feature operates with the light sensor for the Twilight Sentinel and is fully automatic. When the light sensor reads darkness outside and the parking lamps are active, the digital displays can be adjusted by turning the instrument panel brightness knob counterclockwise to dim and clockwise to brighten lighting.

Reading Lamps

The front reading lamps are located in the overhead console. These lamps and the interior courtesy lamps come on when a door is opened and it is dark outside. The rear reading lamps will not come on when a front door is opened.

The rear courtesy lamps are located on the rear headliner above the rear seat outboard positions. When a rear door is opened, both the front and rear reading lamps come on with the courtesy lamps.

Press the button near each lamp to turn it on and off.

If the reading lamps are left on, they automatically shut off 10 minutes after the ignition has been turned off.

Battery Load Management

The battery load management feature is designed to monitor the vehicle's electrical load and determine when the battery is in a heavy discharge condition. During times of high electrical loading, the engine may idle at a higher revolutions per minute (rpm) setting than normal to make sure the battery charges. High electrical loads may occur when several of the following are on: headlamps, high beams, fog lamps, rear window defogger, the climate control fan at high speeds, heated seats and engine cooling fans.

If the battery continues to discharge, even with the engine idling at a higher rpm setting, some electrical loads will automatically be reduced. When this occurs, the rear window defogger may take slightly longer to clear the glass, the heated seats may not get as warm as they usually do and the fan may cut back to a lower speed. For more battery saving information, see "Battery Saver Active Message" under DIC Warnings and Messages .

Inadvertent Power Battery Saver

This feature is designed to protect your vehicle's battery against drainage from the interior lamps, trunk lamp, glove box lamp, cigarette lighters or the garage door opener. When the ignition is turned off, the power to these features will automatically turn off after 10 minutes (three minutes if a new car has 15 miles (24 km) or less). Power will be restored for an additional 10 minutes if any door is opened, the trunk is opened or the courtesy lamp switch is turned on.