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Headlamp Aiming Procedure GMC Sierra 2500

Lighting System 5 illustrations ~374 words

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.
  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 lamp vertical bulb centerline as it is projected onto the aim board.
  16. If the location of the cutoff projected onto the board differs from (Scheme 4) then an adjustment to the beam pattern location is necessary.
  17. Adjust the vertical headlamp adjustment screw until the Right Gradient Line (Cutoff Line) is set at the Horizontal Axis within +/- 2.0 inches (2) measured at 7.62 m (25 ft).
  18. Verify proper aim location.
  19. Repeat the aiming procedure for the passengers side headlamp while blocking the light from projecting onto the screen from the drivers side headlamp.

Scheme 30

Scheme 30: Front Fog Lamp Replacement (Chevrolet)
Scheme 30: Front Fog Lamp Replacement (Chevrolet)
CalloutComponent Name
Preliminary Procedures Remove either the LF or RF wheelhouse liners. Refer to Front Wheelhouse Liner Replacement - Left Side (GMC) , Front Wheelhouse Liner Replacement - Left Side (Chevrolet) , for the LF or Front Wheelhouse Liner Replacement - Right Side (GMC) , Front Wheelhouse Liner Replacement - Right Side (Chevrolet) for the RF wheelhouse liner. Disconnect the electrical connector. From inside the front air deflector, using a six point 10 mm socket or the open end of a 3/8" extension, compress the retainers and push outward on the two upper mounting studs for the fog lamp. Using the same tools, compress the lower retainer and press outward on the low Remove the fog lamp assembly from the lower air deflector.
1Fog Lamp Retainers (Qty: 3) Procedure Install the retainers back onto the fog lamp upper mounting studs. Install the retainer onto the fog lamp adjusting screw. Firmly push the lamp assembly back into the lower air deflector until all three retainers are engaged to the air deflector. Aim the fog lamps after the fog lamp has been replaced. Refer to Fog Lamp Aiming .
2Fog Lamp Assembly WARNING: Refer to Halogen Bulb Warning . Transfer the bulb assembly as needed.
WARNING
Refer to Halogen Bulb Warning .

Front Fog Lamp Replacement (Chevrolet)

Scheme 31

Scheme 31: Front Fog Lamp Replacement (GMC)
Scheme 31: Front Fog Lamp Replacement (GMC)
CalloutComponent Name
Preliminary Procedures Remove either the LF or RF wheelhouse liners. Refer to Front Wheelhouse Liner Replacement - Left Side (GMC) , Front Wheelhouse Liner Replacement - Left Side (Chevrolet) , for the LF or Front Wheelhouse Liner Replacement - Right Side (GMC) , Front Wheelhouse Liner Replacement - Right Side (Chevrolet) for the RF wheelhouse liner. Disconnect the electrical connector. From inside the front air deflector, using a six point 10 mm socket or the open end of a 3/8" extension, compress the retainers and push outward on the two upper mounting studs on the fog lamp. Using the same tools, compress the lower retainer and push outward on the adjustment screw for the fog lamp. Remove the fog lamp assembly.
1Fog Lamp Assembly WARNING: Refer to Halogen Bulb Warning . TIP: Transfer the bulb assembly as needed.
2Fog Lamp Retainers (Qty: 3) Procedure Install the retainers back onto the fog lamp upper mounting studs. Install the retainer onto the fog lamp adjusting screw. Firmly push the lamp assembly back into the front air deflector until all three retainers are engaged to the air deflector. Aim the fog lamps after the fog lamp has been replaced. Refer to Fog Lamp Aiming .
WARNING
Refer to Halogen Bulb Warning .

Front Fog Lamp Replacement (GMC)

Scheme 32

Scheme 32: Front Fog Lamp Bulb Replacement (Chevrolet)
Scheme 32: Front Fog Lamp Bulb Replacement (Chevrolet)
CalloutComponent Name
Preliminary Procedures Reach under the front air deflector in order to access the fog lamp bulb socket. Disconnect the electrical connector.
1Fog Lamp Bulb WARNING: Refer to Halogen Bulb Warning . TIP: Squeeze the tabs and rotate in order to release the bulb socket from the fog lamp assembly.
WARNING
Refer to Halogen Bulb Warning .

Front Fog Lamp Bulb Replacement (Chevrolet)

Scheme 33

Scheme 33: Front Fog Lamp Bulb Replacement (GMC)
Scheme 33: Front Fog Lamp Bulb Replacement (GMC)
CalloutComponent Name
Preliminary Procedures Reach under the front air deflector in order to access the bulb socket. Disconnect the electrical connector.
1Fog Lamp Bulb WARNING: Refer to Halogen Bulb Warning . TIP: Squeeze the tabs and rotate the bulb socket in order to release the bulb socket from the fog lamp assembly.
WARNING
Refer to Halogen Bulb Warning .

Front Fog Lamp Bulb Replacement (GMC)

Scheme 34

Scheme 34: Front Fog Lamp Cover Replacement (GMC HD)
Scheme 34: Front Fog Lamp Cover Replacement (GMC HD)
CalloutComponent Name
Preliminary Procedure Reach under the front lower air deflector in order to access and release the front fog lamp opening cover clips from the air deflector.
1Front Fog Lamp Opening Cover

Front Fog Lamp Cover Replacement (GMC HD)