2009 Pontiac G8 Owner's Manual - Page 234

9-30 Vehicle Service and Care Notice: Do not cover a headlamp to improve beam cut-off when aiming. Covering a headlamp may cause excessive heat build-up which may cause damage to the headlamp. 6. Turn on the low-beam headlamps and place a piece of cardboard or equivalent in front of the headlamp not being adjusted. Do not place it directly on the headlamp. This allows only the beam of light from the headlamp being adjusted to be seen on the flat surface. Driver Side (Passenger Side Similar) 7. Locate the vertical headlamp aiming screws, which are under the hood near each headlamp assembly. The adjustment screw can be turned with a 6 mm socket wrench. 8. Turn the vertical aiming screw clockwise or counterclockwise until the headlamp beam is aimed to the horizontal tape line. 9. Make sure that the light from the headlamp is positioned at the bottom edge of the horizontal tape line. The lamp on the left (A) shows the correct headlamp aim. The lamp on the right (B) shows the incorrect headlamp aim. 10. Repeat Steps 7 through 9 for the opposite headlamp.