Toyota Tundra Service Manual: Adjustment

ADJUSTMENT

CAUTION / NOTICE / HINT

HINT:

• Use the same procedure for the RH and LH sides.
• The procedure listed below is for the LH side.
• It is possible that a bulb is incorrectly installed, affecting headlight aim. Bulb installation should be considered prior to performing the adjustment procedure.
• It is possible that a No. 1 headlight bulb is incorrectly installed, affecting headlight aim. Headlight assembly and No. 1 headlight bulb installation should be considered prior to performing the adjustment procedure.

PROCEDURE

1. VEHICLE PREPARATION FOR HEADLIGHT AIMING ADJUSTMENT

(a) Prepare the vehicle:

• Make sure that there is no damage to the body around the headlights.
• Fill the fuel tank.
• Make sure that the oil is filled to the specified level.
• Make sure that the coolant is filled to the specified level.
• Inflate the tires to the appropriate pressure.
• Unload the trunk and vehicle, ensuring that the spare tire, tools and jack are in their original positions.
• Have a person of average weight (68 kg, 150 lb) sit in the driver seat.
• Bounce the vehicle at the corners up and down to stabilize the suspension.
• Set the headlight leveling switch dial to 0.

2. PREPARATION FOR HEADLIGHT AIMING (Using a Tester)

(a) Adjust the headlight aim in accordance with the tester instructions.

3. PREPARATION FOR HEADLIGHT AIMING (Using a Screen)

(a) Prepare the vehicle:

• Place the vehicle in a location that is dark enough to clearly observe the cutoff line. The cutoff line is a distinct line, below which light from the headlights can be observed and above which it cannot.
• Place the vehicle at a 90° angle to the wall.
• Create a 7.62 m (25 ft.) distance between the vehicle (headlight bulb center) and wall.
• Make sure that the vehicle is on a level surface.
• Bounce the vehicle up and down to settle the suspension.

NOTICE:

A distance of 7.62 m (25 ft.) between the vehicle (headlight bulb center) and the wall is necessary for proper aim adjustment. If unavailable, secure a distance of exactly 3 m (9.84 ft.) for the check and adjustment. (The target zone will change with the distance, so follow the instructions in the illustration.)

(b) Prepare a piece of thick white paper approximately 2 m (6.56 ft.) (height) x 4 m (13.1 ft.) (width) to use as a screen.

(c) Draw a vertical line down the center of the screen (V line).

(d) Set the screen as shown in the illustration.

HINT:

• Stand the screen perpendicular to the ground.
• Align the V line on the screen with the center of the vehicle.

(e) Draw base lines (H, V LH, and V RH lines) on the screen as shown in the illustration.

HINT:

• The base lines differ for "low beam inspection" and "high beam inspection".
• Mark the No. 1 headlight bulb center marks on the screen. If the center mark cannot be observed on the headlight, use the center of the No. 1 headlight bulb as the center mark. Text in Illustration

  *a	Center Mark

(1) H Line (Headlight):

Draw a horizontal line across the screen so that it passes through the center marks. The H line should be at the same height as the headlight bulb center marks of the low beam headlights.

(2) V LH Line, V RH Line (Center mark position of the left-hand (LH) and right-hand (RH) headlights):

Draw two vertical lines so that they intersect the H line at each center mark (aligned with the center of the low beam headlight bulbs).

4. INSPECT HEADLIGHT AIMING

(a) Cover the headlight or disconnect the connector of the headlight on the opposite side to prevent light from the headlight that is not being inspected from affecting the headlight aiming inspection.

NOTICE:

Do not keep the headlight covered for more than 3 minutes. The headlight lens is made of synthetic resin, which may melt or be damaged due to excessive heat.

(b) Start the engine.

(c) Turn on the low beams and check if the cutoff line matches the preferred cutoff line in the following illustration.

HINT:

• Since the low beam light and the high beam light are a unit, if the aim on the low beam is correct, the high beam should also be correct. However, check both beams just to make sure.
• If the alignment distance is 7.62 m (25 ft.):

  for RH Side:

  The low beam cutoff line should be within 27 mm (1.06 in.) above the H line (SAE J599).

  for LH Side:

  The low beam cutoff line should be within 32 mm (1.26 in.) above the H line (SAE J599).

• If the alignment distance is 3 m (9.84 ft.):

  for RH Side:

  The low beam cutoff line should be within 12 mm (0.47 in.) above the H line (SAE J599).

  for LH Side:

  The low beam cutoff line should be within 20 mm (0.79 in.) above the H line (SAE J599).

(d) Turn on the high beams and check if the center of intensity for each high beam matches the preferred center of the intensity in the illustration.

HINT:

• Since the low beam light and the high beam light are a unit, if the aim on the low beam is correct, the high beam should also be correct. However, check both beams just to make sure.
• If the alignment distance is 7.62 m (25 ft.):

  The high beam center of intensity should be within 101 mm (3.97 in.) above or below the H line as well as 101 mm (3.97 in.) left and right of the V LH or V RH line (SAE J599).

• If the alignment distance is 3 m (9.84 ft.):

  The high beam center of intensity should be within 40 mm (1.57 in.) above or below the H line as well as 40 mm (1.57 in.) left or right of the V LH or V RH line (SAE J599).

5. ADJUST HEADLIGHT AIMING

(a) Using a screwdriver, adjust the aim. Adjust the aim of each headlight so that it is within the specified range by turning each aiming screw with a screwdriver. NOTICE: The final turn of the aiming screw should be made in the clockwise direction. If the screw is tightened excessively, loosen it, and then retighten it so that the final turn of the screw is in the clockwise direction. HINT: The low beam and high beam headlights are a unit. Adjusting the aim on the low beam to the correct position should also result in the high beam adjustment being correct. If it is not possible to correctly adjust the headlight aim, check the headlight assembly and No. 1 headlight bulb installation. The headlight aim moves up when turning the vertical aiming screw clockwise, and moves down when turning the vertical aiming screw counterclockwise. Text in Illustration *a Aiming Screw