2005 Pontiac Grand Prix Owner's Manual - Page 255

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. The traction you can get in a curve depends on the condition of your tires and the road surface, the angle at which the curve is banked, and your speed. While you are in a curve, speed is the one factor you can control. Suppose you are steering through a sharp curve. Then you suddenly apply the brakes. Both control systems - steering and braking - have to do their work where the tires meet the road. Unless you have four-wheel anti-lock brakes, adding the hard braking can demand too much of those places. You can lose control. The same thing can happen if you are steering through a sharp curve and you suddenly accelerate. Those two control systems - steering and acceleration - can overwhelm those places where the tires meet the road and make you lose control. See Traction Control System (TCS) on page 4-9 or Enhanced Traction System (ETS) on page 4-10. What should you do if this ever happens? Ease up on the brake or accelerator pedal, steer the vehicle the way you want it to go, and slow down. Speed limit signs near curves warn that you should adjust your speed. Of course, the posted speeds are based on good weather and road conditions. Under less favorable conditions you will want to go slower. Variable Effort Steering If your vehicle has this steering system, the system provides less steering effort for parking and when driving at speeds below 20 mph (32 km/h). Steering effort will increase at higher speeds for improved road feel. Steering Tips Driving on Curves It is important to take curves at a reasonable speed. A lot of the "driver lost control" accidents mentioned on the news happen on curves. Here is why: Experienced driver or beginner, each of us is subject to the same laws of physics when driving on curves. The traction of the tires against the road surface makes it possible for the vehicle to change its path when you turn the front wheels. If there is no traction, inertia will keep the vehicle going in the same direction. If you have ever tried to steer a vehicle on wet ice, you will understand this. 4-13