Chevrolet Silverado / GMC Sierra. Service manual — part 2499

Fig. 33: Headlamp Bulb Replacement (GMC)
Courtesy of GENERAL MOTORS CORP.

HEADLAMP BULB REPLACEMENT (CHEVROLET)

Callout

Component Name

Preliminary Procedure:
Remove either the LF or RF headlamp assembly. Refer to Headlamp Replacement
(GMC HD) or Headlamp Replacement (Chevrolet).

1

Headlamp Bulb (Hi)

Tip: Rotate the bulb socket a quarter turn counterclockwise and remove the
bulb from the headlamp.

CAUTION:

Refer to Halogen Bulb Caution .

2

Headlamp Bulb (Lo)
Tip: Rotate the bulb socket a quarter turn counterclockwise and remove the
bulb from the headlamp.

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 34: Headlamp Bulb Replacement (Chevrolet)
Courtesy of GENERAL MOTORS CORP.

Callout

Component Name

Preliminary Procedure:
Remove either the LF or RF headlamp Assembly. Refer to Headlamp Replacement
(GMC HD) or Headlamp Replacement (Chevrolet).

1

Headlamp Bulb (Hi)

Tip: Disconnect the headlamp bulb electrical connector and turn the bulb
assembly a quarter counterclockwise to remove.

CAUTION:

Refer to Halogen Bulb Caution .

2

Headlamp Bulb (Lo)
Tip: Disconnect the headlamp bulb electrical connector and turn the bulb
assembly a quarter counterclockwise to remove.

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

HEADLAMP AIMING (CHEVROLET/GMC)

Headlamp aiming is done with the low beam lamps. The high beam lamps will be correctly aimed
if the low beam lamps are aimed properly.

Screen Method for Headlamp Aiming (Visual Aim)

The screen method requires an area set up specifically for headlamp aim.

The area should consist of a level surface large enough to allow for a vehicle and an additional
7.62 m (25 ft) as measured from the face of the headlamps to the aiming screen.

The screen should be a wall or other flat surface at least 1.52 m (5 ft) high by 3.66 m (12 ft) wide
with a matte white surface well shaded from extraneous light, and 90 degrees to the floor. The
screen should be provided with a permanent vertical reference line 0.61 m (2 ft) from the left
edge of the screen, 2 laterally adjustable vertical tapes, and one vertically adjustable horizontal
tape.

After the aiming screen has been set up and located, paint or tape a reference line on the floor
15.24 m (50 ft) from the vertical reference line on the screen. This line should be perpendicular
to the aiming screen and a mark placed at 7.62 m (25 ft) from the screen.

Headlamp Aiming Procedure

1. Align the left tires of the vehicle with the reference line extending from the screen with the

headlamps aligned with the reference line.

2. Remove any snow, ice or mud from the vehicle.

3. The vehicle should be fully assembled and all other work stopped while the headlamp

aiming is being done.

4. The vehicle should contain cargo or be loaded to represent normal vehicle use.

5. Tires should be properly inflated.

6. Rock the vehicle to stabilize the suspension.

7. Measure from the floor to the center of the lamp bulb on the vehicle. Some lamps have an

aim dot marked on the lens.

8. At the screen, measure from the floor and place the horizontal tape at the measured distance.

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 35: View Of Left Headlamp Bulb Centerline & Measured Distance
Courtesy of GENERAL MOTORS CORP.

9. Measure from the reference line on the floor to the left headlamp bulb centerline (1).

10. At the screen, measure from the reference line and place the vertical tape at the measured

distance (2).

11. Measure from the reference line on the floor to the right headlamp bulb centerline.

12. At the screen, measure from the reference line and place the vertical tape at the measured

distance.

13. Turn the headlamps ON.

14. Block the light from projecting onto the screen from the passenger side headlamp. This will

allow the cutoff in the beam pattern from the drivers side to be more pronounced for easier
aim verification.

15. On this vehicle you will be verifying the aim of the vertical cutoff on the right side of the

IMPORTANT: DO NOT cover the headlamp, this may cause excessive heat

build up.

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Lighting - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado