GM Service Manual Online
For 1990-2009 cars only

Some vehicles may have the QUADRASTEERâ„¢ System.

If your vehicle is equipped with the 4 Wheel Steer system it has the ability to steer the vehicle with all four wheels

Once the 4 Wheel Steer mode is selected, it is recommended to leave the vehicle in this mode at all times, and during all driving and weather conditions.

You can select this mode at any speed; however, if you are turning the system will not engage until the turn is complete. See your vehicle's owner's manual for more information.