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.

1. While the vehicle is raised on a hoist, 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. Start the engine.
4. Install a scan tool.
5. With the scan tool in hand, Select Chassis.
6. Select Air Suspension Control Module.
7. Select Special Functions.
8. Select Pressurize System.
9. Press the ON soft key and visually observe the springs as their air pressures inflate.
10. 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 40 seconds.
11. Press the Exit key.
12. Lower the vehicle.
13. Cycle the ignition switch OFF then start and run the engine for 2 minutes to allow the vehicle to level at the designed ride height.