1995 Honda Prelude Owner's Manual - Page 213
1995 Honda Prelude Manual
Page 213 highlights
Four Wheel Steering The SR 4WS model in Canada is equipped with an electronic Four Wheel Steering system. As inputs, the 4WS system uses a vehicle speed sensor and a sensor to measure how far the front wheels are turned. The electronic control unit for the 4WS system uses these inputs to determine which direction to steer the rear wheels, and at what angle. Depending on vehicle speed and the angle of the front wheels, the rear wheels will be "countersteered" (steered in the opposite direction of the front wheels) or "same-steered" (steered in the same direction as the front wheels). The 4WS electronic control unit drives an electric motor built into the rear steering box. Sensors for rear wheel angle and speed provide feedback. The electronic control unit uses this feedback to compare the actual rear wheel angle to the desired angle. When the driver turns the front wheels with the car traveling less than 18 mph (30 km/h), the rear wheels are countersteered. The angle of countersteer increases as the angle of the front wheels increases, to a maximum countersteer angle of six degrees. This improves response when parallel parking or making sharp turns. Above 18 mph (30 km/h), the rear wheels are same-steered as the driver begins to turn the steering wheel. The rear wheel angle for any given steering wheel angle is not fixed; it increases as vehicle speed increases. This improves response in lane-changing maneuvers. As the driver continues to turn the steering wheel, the rear wheels are steered back to the straight-ahead position and then to countersteer mode. As with same steer, the angle of countersteer varies with vehicle speed; increasing and then decreasing as the speed rises. This gives improved handling in low, medium, and high speed curves. The 4WS system's electronic control unit monitors the sensors whenever the ignition is ON. If it detects a problem anywhere in the system, it lights the 4WS indicator on the instrument panel and turns the system off. With the system off, the rear wheels remain pointed straight ahead. Your car will then drive like a conventional car without 4WS. Technical Information