Circuit Description

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The digital steering wheel position sensor inputs to the electronic suspension control (ESC) module consists of 3 digital input circuits, phase A, phase B and index marker pulse. The steering wheel position sensor supply voltage is between 4.9-5.1 volts. The information that the ESC module receives from the steering wheel position sensor is used to calculate steering angle, steering velocity and lateral acceleration. These values are used in the control of the suspension dampers.

The digital steering wheel position sensor phase A and phase B circuits are digital pulse signals whose output represents one degree of steering wheel rotation. When observing the phase A data and the phase B data parameters on the scan tool, the parameters will not have the same value at the same time. When the steering wheel is rotated, the phase A data and the phase B data parameters will be shown as high or low on the scan tool.

The index marker pulse is a digital pulse that is displayed as high on the scan tool for 20 degrees only when the steering wheel angle is between -10 and +10 degrees.