1997 Buick LeSabre Owner's Manual - Page 285

2. Locate the headlamp aiming screwthat is under the hood. 3. T r the vertical aiming screw until the bubble un inside the level is centered at zero "0". 4. After the vertical aim is correct, checkthe horizontal aim for each headlamp adjust as necessary. Turn and the horizontal aiming screw until end of the the screw aligns with the "0". zero 5. Re-check the verticalaim to make sure it remains correct after the horizontal aim adjustment. Adjust as necessary. 6-37