2007 Lexus GS 350 Owners Manual - Page 504

4-3. Do-it-yourself maintenance n Adjusting the headlight aim Low beam (vertical adjustment) STEP 1 Using a Phillips-head screwdriver, turn adjustment bolt A so that the bubble is within the 2 center lines. Remember the turning direction and the number of turns. STEP 2 Turn bolt B the same number of turns and in the same direction as step 1. Low beam (horizontal adjustment) Turn adjustment bolt A so that the red line on the gauge is in the middle of the "0" mark (within the blue lines to either side of the gauge). High beam (vertical and horizontal adjustment) Turn each adjustment bolt in either direction so that the bubble in within the 2 center lines (vertical), and the red line on the gauge is in the middle of the "0" mark (within the blue lines to either side of the gauge) (horizontal). If you feel that there is a large deviation, have the headlight aim adjusted at a Lexus dealer. 430