Visual/Physical Inspection

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

Inspect for aftermarket devices which could affect the operation of any of the suspension subsystems.
Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
Inspect for proper tire size and inflation pressure. See Fig 1.

Fig 1: Inspecting Tire Placard

Courtesy of GENERAL MOTORS CORP.