2005 Buick LeSabre Owner's Manual - Page 127

Light Sensor Your Twilight Sentinel® and DRL work with the light sensor located on top of the instrument panel. Instrument Panel Brightness The lever for this feature is located to the left of the steering column. Do not cover it up. If you do, it will sense darkness and the Twilight Sentinel® lighting will turn on. Exterior Lighting Battery Saver If the exterior lamp button has been left on, the exterior lamps will turn off about 10 minutes after the ignition is turned to LOCK and a door has been opened. This protects against draining the battery in case you have accidentally left the headlamps or parking lamps on. If you need to leave the lamps on for more than 10 minutes, use the manual control to turn the lamps back on after the ignition is turned to LOCK and any door is opened. To delay the lamps from turning off, see Twilight Sentinel® on page 3-16. The brightness of the instrument panel lights can be adjusted by sliding the INTERIOR lever from LO to HI. The instrument panel lights will be on only while the parking lamps are on. The interior courtesy lamps can be turned on by sliding the INTERIOR lever all the way to HI. Courtesy Lamps If it is dark enough outside, when any door is opened, several lamps go on. They make it easy for you to enter and leave the vehicle. You can also turn these lamps on by sliding the INTERIOR lever all the way to HI. 3-17