Hummer H2. Manual - part 340

Fig. 79: Retaining Nuts & Connecting Electrical Connector 
Courtesy of GENERAL MOTORS CORP. 

1. Install the bulb to the socket.  

2. Install the headlamp bulb retaining ring.  

3. Connect the electrical connector (4).  

4. Close the hood.  

HEADLAMP AIMING 

Tools Required 

J 25300-D Headlamp Aimer. See Special Tools and Equipment .

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2

  

The screen method is preferred for aiming headlamps. If the headlamp is equipped with aiming pads, headlamp 
aiming may be performed using the alternate procedure. 

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. If the high beam needs adjustment, follow the screen method using the high 
beam bulb as the reference for measurements. 

Screen Method for Headlamp Aiming (Visual Aim) 

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

Fig. 80: Identifying Aiming Screen & Vehicle Alignment 
Courtesy of GENERAL MOTORS CORP. 

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.

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2

  

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. 

Fig. 81: Measuring Headlamp Bulb Centerline 
Courtesy of GENERAL MOTORS CORP. 

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

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

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. Adjust the headlamps to the specifications required by state and local authorities.  

Alternate Aiming Procedure 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2

  

Instructions for use accompany the tool. 

This procedure may only be used on headlamps equipped with aiming pads. Adjustment settings are embossed 
on the headlamp lens. They are typically located near the aiming pads. In some cases, the adjustment settings 
are located in other areas of the lens. They will be represented by a number followed by the letter "V" or the 
letter "H". 

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

2. The vehicle should be fully assembled and all other work stopped while the headlamp aiming is being 

done.  

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

4. Tires should be properly inflated.  

5. Rock the vehicle to stabilize the suspension.  

6. Using the J 25300-D , adjust the headlamps to the specifications required by state and local authorities. 

See Special Tools and Equipment .  

OFF-ROAD LAMP REPLACEMENT - ROOF 

Removal Procedure 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2