Headlamp: Adjustments
PRE-AIMING INSTRUCTIONS1. Inspect for badly rusted or faulty headlight assemblies.
2. These conditions must be corrected before a satisfactory adjustment can be made.
3. Place vehicle on a level floor.
4. Bounce front suspension through three (3) oscillations by applying body weight to hood or bumper.
5. Inspect tire inflation.
6. Rock vehicle sideways to allow vehicle to assume its normal position.
7. If fuel is not full, place a weight in trunk of vehicle to simulate weight of a full tank [3 kg (6.5 lbs.) per gallon.]
8. There should be no other load in the vehicle other than driver or substituted weight of approximately 70 kg (150 lbs.) placed in driver's position.
Thoroughly clean headlight lenses.
VERTICAL ADJUSTING
Adjust the vertical angle by rotating the vertical adjusting screw so that the bubble in the vertical adjusting gauge locates inside the adjusting range.
HORIZONTAL ADJUSTING
1. Check that gear (A) and gear (B) are engaged. If they are not engaged, press down the stopper until the gears engage.
2. Turn the horizontal adjusting screw to align the "0" mark of gear (B) with the stopper line and the headlight housing line.
NOTE: If on-vehicle aiming adjustment cannot be carried out because repairs are being made to the body as a result of an accident, follow the aiming procedure using the screen which is given in the next topic to carry out adjustment.
AIMING WITH SCREEN
Headlight Aim Preparation:
Headlight Aim Preparation
1. Set the distance between the screen and the bulb center marks of the headlight as shown in the illustration.
2. Four lines of adhesive tape or like are required on screen or wall:
1. Position a vertical tape so that it is aligned with the vehicle center line.
2. Position a horizontal tape with reference to center line of headlight bulb.
3. Position a vertical tape on the screen with reference to the center line of each headlight bulb.
Visual Headlight Adjustment
1. A properly aimed lower beam will appear on the aiming screen 3 m (9.8 feet) in front of the vehicle. The shaded area as shown in the illustration indicates high intensity zone.
NOTE: The position which is 3 m (9.8 ft.) in front of the vehicle is measured from the headlight center mark.
2. Adjust low beam of headlights to match the low beam pattern of the right and left headlights.
CAUTION: When adjusting one headlight, the other headlight should be turned off if possible. If this is not possible, do not cover the other headlight for more than three minutes while it is turned on. Otherwise, heat from the bulb may warp the headlight lens.
NOTE: If the visual headlight adjustment at low beam is made, the adjustment at high beam is not necessary.
Vertical Adjusting
1. Adjust the vertical angle by rotating the vertical adjusting screw so that the bubble in the vertical adjusting gauge locates inside the adjusting range.
2. Check to see if the light distribution projected on the aiming screen is as same as the light distribution pattern described in Visual Headlight Adjustment.
3. In case they differ, turn the vertical adjusting screw to adjust the vertical angle until the light distribution coincides with the correct lighting pattern.
Horizontal Adjusting:
Horizontal Adjusting
1. Check that gear (A) and gear (B) are engaged. If they are not engaged, press down the stopper until the gears engage.
2. Check to see if the light distribution projected on the aiming screen is as same as the light distribution pattern described in Visual Headlight Adjustment.
3. In case they differ, turn the vertical adjusting screw to adjust the vertical angle until the light distribution coincides with the correct lighting pattern.
4. Turn the horizontal adjusting screw to align the "0" mark of gear (B) with the stopper line and the headlight housing line.
LUMINOUS INTENSITY MEASUREMENT
Measure the luminous intensity of headlights with a photometer in accordance with the instruction manual prepared by the manufacturer of the photometer and make sure that the luminous intensity is within the following limit.
Limit:
High-beam: 18,000 Cd or more
Low-beam: 7,000 Cd or more
NOTE:
1. When measuring the luminous intensity of headlight, keep the engine at 2,000 rpm and have the battery charged.
2. If there are specific regulations for luminous intensity of headlights in the region where the vehicle is operated, make sure that the intensity conforms to the requirements of such regulations.