Tools Required

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.

CH-47816 Suspension Position Calibration Blocks. See Special Tools .

IMPORTANT: Before proceeding with the steps below, ensure:

There are no stored diagnostic trouble codes stored in the ASCM.
The vehicle is on level ground.
There are no occupants in the vehicle.
The tire pressures are at the recommended kPa/psi.
All vehicle doors are closed.

Raise the vehicle on a hoist.
Install the CH-47816 on to the LR and RR jounce bumper mounting cups. See Special Tools .
Lower the vehicle off the hoist.
Depressurize the air suspension system in order to allow the full rear weight of the vehicle to rest on the blocks and rear axle. Refer to Air Suspension Depressurization .
Turn ON the ignition, with the engine OFF.
Install a scan tool.
With the scan tool select Chassis.
Select Air Suspension.
Select Special Functions.
Select Trim Height Calibration and press the Enter key. The scan tool will flash Calibration In Progress, then display Calibration Complete.
Press the Exit key.
Pressurize the air suspension system until the rear weight of the vehicle is lifted of the blocks. Refer to Air Suspension Pressurization .
Remove the CH-47816 . See Special Tools .
Ensure all vehicle doors are closed. 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.
After ensuring all vehicles doors are closed, use the scan tool to raise and lower the vehicle by commanding the extended ride height switch special function each time to verify the air suspension system is functioning properly.