SECTION 06: ELECTRICAL
DOB 2490-2789 | X3-45 Commuter PA1605 Maintenance Manual (Final Version) – Sec 06 revised June 2017
43
Caution
Use a soft cloth to clean the parking and front
turn signal lamp.
10.1.2 Headlight adjustment
1. Headlight aiming and inspection can be
accomplished by visual means. This is done
on a screen located at a distance of 25 feet
of the headlights. It should be of adequate
size with a matte-white surface well shaded
from extraneous light and properly adjusted
to the floor area on which the vehicle stands.
Provisions should be made for moving the
screen or its vertical centerline so that it can
be aligned with the vehicle axis. In addition
to the vertical centerline, the screen should
be provided with four laterally adjustable
vertical tapes and two vertically adjustable
horizontal tapes.
2. The four movable vertical tapes should be
located on the screen at the left and right
limits called for in the specification with
reference to centerlines ahead of each
headlight assembly.
3. The headlight centerlines shall be spaced
either side of the fixed centerline on the
screen by ½ the lateral distance between
the light source centers of the pertinent
headlights. The horizontal tapes should be
located on the screen at the upper and lower
limits called for in the specification with
reference to the height of beam centers and
the plane on which the vehicle rests, not the
floor on which the screen rests.
Table 1 – vertical beam aim guidelines
Headlight
(centerline)
Mounting
height
Nominal
Vertical
aim
Aim inspection limits
for vertical aim
22 to 36 inch 0 vertical
4 inch up to 4 inch
down
36 to 48 inch 2 inch
down
2 inch up to 6 inch
down
48 to 54 inch 4 inch
down
1.5 inch up to 6.5
inch down
4. The nominal vertical aim position on lower
beam headlights shall be adjusted based on
the headlight mounting height, from the
ground to the light source center of the
headlight, according to table 1.
FIGURE 42: ALIGNMENT OF HEADLIGHT AIMING
SCREEN 06502
5. High beam headlights are aimed so that the
center of the high-intensity zone is located at
the horizontal and straight ahead vertically
(Figure 43).
6. Low beam headlights are aimed so that the
top edge (the cutoff) of the high-intensity
zone is at the vertical location as per table 1
and the left edge of the high-intensity zone
is at the vertical centerline of the headlight
(Figure 44).
7. The inspection limits for high-beam
headlights shall be with the center of the
high-intensity zone from 10 cm (4 in) up to
10 cm (4 in) down; and, from 10 cm (4 in)
left to 10 cm (4 in) right on a screen at 7.6 m
(25 ft) (Figure 45).
FIGURE 43: PROPER UPPER BEAM HIGH-INTENSITY
ZONE AT 25FT
06503
