The variable effort steering (VES) system varies the driver effort that is required to steer as the vehicle speed changes. At low speeds, the system provides maximum power assist for easy turning and parking maneuvers. At higher speeds, steering effort is increased in order to provide the driver with firmer steering (road feel) and directional stability.

The VES system varies the driver effort by reducing the current to the variable effort steering (VES) actuator on the power steering gear. When the vehicle is stationary, the system provides maximum current, allowing maximum power steering assist. As the vehicle speed increases, the current is decreased, reducing the amount of steering assist. The VES system consists of the following power steering components:

The VES steering system software is contained in the speed sensitive power steering (SSPS) control module. The SSPS control module processes vehicle speed information from the vehicle speed sensor. The SSPS control module uses the vehicle speed in order to provide a control signal to the magnetic coil in the variable effort steering (VES) actuator located on the power steering gear.

The VES actuator is mounted on the power steering gear. It consists of a magnetic coil that increases steering effort as the commanded current is reduced.

VES system components are similar to non-VES power steering components.

The design of the VES power rack and pinion assembly is the same as for a non-VES system.

The standard vane-type pump provides hydraulic pressure for the system.