Hummer H2. Manual — part 2217

To depressurize the Air Suspension System install the scan tool with key in the on position. Go to the special
functions menu of the Air Suspension section and follow the on screen directions. The suspension will deflate
the air springs until the suspension is on the jounce bumpers.

AIR SUSPENSION PRESSURIZATION PROCEDURE

1. While the vehicle is raised, ensure that the lower end of the air springs are completely engaged in the

spring supports on the axle housing.

2. Lower the vehicle but do not allow the vehicles tires to contact the ground.

3. Turn the ignition ON, with the engine OFF.

4. Install a scan tool.

5. With the scan tool in hand, raise the vehicle.

6. With the scan tool select Special Functions.

7. Select Compressor Test.

8. Press the ON soft key and visually observe the springs as their air pressures inflate.

9. When the air spring inflation pressures have reached a pressure where there are no visible wrinkles, or

folds in the air springs, press the OFF soft key. This function will also stop after 90 seconds.

10. Press the Exit key.

11. Lower the vehicle.

12. Cycle the ignition OFF, then back ON, with the engine ON to allow the air suspension system to regain

the desired rear suspension position.

ELECTRONIC SUSPENSION SWITCH REPLACEMENT

Removal Procedure

1. Remove the instrument panel trim plate bezel. Refer to Trim Panel Replacement - Instrument Panel

(I/P) Center in Instrument Panel, Gauges, and Console.

IMPORTANT: Any time the air suspension system has been depressurized, it is necessary to

follow the steps below to avoid air spring damage upon lowering the vehicle
and adding weight to the rear suspension components.

2004 Hummer H2

2004 SUSPENSION Air Suspension - Hummer H2

Fig. 8: Switch Receptacle Screws
Courtesy of GENERAL MOTORS CORP.

2. Remove the switch receptacle screws.

2004 Hummer H2

2004 SUSPENSION Air Suspension - Hummer H2

Fig. 9: Switch Receptacle & Instrument Panel
Courtesy of GENERAL MOTORS CORP.

3. Pull the switch receptacle from the instrument panel and disconnect the electrical connectors from the

switch.

2004 Hummer H2

2004 SUSPENSION Air Suspension - Hummer H2

Fig. 10: Electronic Suspension Switch
Courtesy of GENERAL MOTORS CORP.

4. Remove the switch from the receptacle.

Installation Procedure

2004 Hummer H2

2004 SUSPENSION Air Suspension - Hummer H2