Roll Stability Control (RSC)

The roll stability control (RSC) system constantly monitors the vehicle motion relative to the intended course. This is done by using sensors to compare the steering input and brake application with that of the actual vehicle motion. The system does not activate when the vehicle is traveling in reverse; however, the standard ABS and traction control continue to function as usual. The RSC system monitors information from the wheel speed sensors, the throttle position sensor, the steering wheel rotation sensor (steering wheel angle and rate of change) and a roll-rate sensor (integral to the stability control sensor cluster) that measures changes in vehicle motion. If the RSC system determines from all these inputs that conditions exist for a potential roll-over event, the system adjusts the brake torque at specific wheels in response to direct measurement of the vehicle roll motion and reduces engine torque to make the vehicle more stable. By adjusting brake torque, the system can reduce the cornering forces and, therefore, the total roll moment acting on the vehicle. The RSC system can be deactivated by pressing the stability/traction control switch in the instrument panel.

When the RSC system activates, any of the following can occur:

• A rumble or grinding sound much like ABS or traction control
• A small deceleration or a reduction in the acceleration of the vehicle
• The RSC indicator flashes
• If the driver's foot is on the brake pedal, a vibration will be felt in the pedal much like ABS

Some drivers may notice a slight movement of the brake pedal when the system checks itself. The brake pedal moves when an active test of the brake booster is run. During this test a small amount of pressure is generated at the master cylinder, but no pressure is generated in the brake calipers.