SMU - New Suspension Position Calibration Procedure Added

This bulletin is being issued to add the Suspension Position Calibration procedure in the Air Suspension sub-section of the Service Manual.

The following information has been updated within SI. If you are using a paper version of this Service Manual, please make a reference to this bulletin on the affected page.

A new essential tool has been developed and shipped to all North American dealers for the H2 air suspension system. These Suspension Position Calibration Blocks, CH-47816, are to be used during the suspension position calibration procedure.

Suspension Position Calibration

This procedure noted below should be performed after compressor assembly, air suspension control module, or suspension position sensor replacement. Uneven suspension position can also be corrected by performing this procedure.

Important: Before proceeding with the steps below, ensure:

1. Raise the vehicle on a hoist.



2. Install the suspension position calibration blocks on the LR and RR jounce bumper mounting cups.
3. Lower the vehicle off the hoist.
4. 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 Procedure.
5. Turn ON the ignition, with the engine OFF.
6. Install a scan tool.
7. With the scan tool select Chassis.
8. Select Air Suspension.
9. Select Special Functions.
10. Select Trim Height Calibration and press the Enter key. The scan tool will flash Calibration In Progress, then display Calibration Complete.
11. Press the Exit key.
12. Pressurize the air suspension system until the rear weight of the vehicle is lifted off the blocks. Refer to Air Suspension Pressurization Procedure.
13. Remove the calibration blocks.
14. Cycle the ignition switch Off then start and run the engine for 2 minutes. Verify the Air Suspension system is functioning properly.