Lexus GS430 User Manual page 616

ELECTRICAL COMPONENTS
Adjusting the headlight aiming (high beam)
G64025
" 1 Adjusting bolt A
2 Adjusting bolt B
592
G64026
" 1 Bubble
2 Acceptable range
Vertical movement gauge: The bubble of the gauge should
not deviate from the center of the gauge by more than 2 marks
to either side of the gauge.
If the bubble is out of the acceptable range of the beam angle
gauge, adjust it using bolt A.