2008 Cadillac STS Owner's Manual - Page 291

All-Wheel Drive (AWD) System If your vehicle has this feature, engine power is sent to all four wheels all the time. This is like four-wheel drive, but it is fully automatic. system reduces steering effort at low speeds, improves steering feel at moderate speeds, and reduces steering sensitivity at higher speeds. During some operating conditions, the active steering might deactivate to protect the system from damage. You might notice that the center position of the steering wheel is changed. Unless there is a SERVICE STEERING SYS message, the system will return to normal operation as soon as the condition ceases, usually within a very short period of time. At low speeds, the active steering system requires less movement of the steering wheel to change vehicle direction than the normal power steering system. Adjust your driving accordingly. When certain steering faults are present, the active steering deactivates and vehicle speed might be limited. The SERVICE STEERING SYS and SPEED LIMITED TO XXX messages will be displayed. See DIC Warnings and Messages on page 3-80. The normal power steering system is still operational. You might notice that the center position of the steering wheel is changed and that more steering effort at low speeds and less steering effort at high speeds is required. You can continue to drive your vehicle with normal power steering but you should have your dealer/retailer inspect the steering system as soon as possible in order to have the problem corrected and the steering wheel position centered. 4-13 Steering Power Steering If you lose power steering assist because the engine stops or the system is not functioning, you can steer but it will take much more effort. Speed Variable Assist Steering Your vehicle has a steering system that continuously adjusts the effort you feel when steering at all vehicle speeds. It provides ease when parking, yet a firm, solid feel at highway speeds. Active Steering All-wheel-drive vehicles with the Active Steering with Enhanced StabiliTrak® option have an electronically controlled active steering system. The active steering system uses the steering actuator to automatically adjust the front road wheel turning angle based on vehicle speed and how much you turn the steering wheel. This