2001 Buick LeSabre Owner's Manual - Page 159

If the sun comes out and the sky becomes cloudy, you may need to adjust the HUD brightness using the dimmer control. Polarized sunglasses could make the HUD image harder to see. To change the display from English to metric units, push the ENG/MET button located to the left of the steering column. Clean the inside of the windshield as necessary to remove any dirt or film that reduces the sharpness or clarity of the HUD image. To clean the HUD lens, spray household glass cleaner on a soft, clean cloth. Gently wipe and dry the HUD lens. Do not spray cleaner directly on the lens to avoid cleaner leaking inside the unit. If the ignition is on and you can't see the HUD image, check to see if: D D D D Something is covering the HUD unit. The HUD dimmer control is adjusted properly. The HUD image is adjusted to the proper height. A fuse is blown. See "Fuses and Circuit Breakers" in the Index. Keep in mind that your windshield is part of the HUD system. If you ever have to have your windshield replaced, be sure to get one that is designed for HUD or your HUD image may look blurred or out of focus. 2-94