Steering Wheel Position Sensor - Digital Signal

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3 outputs used - Phase A, Phase B, Index Marker Pulse
Phase A & Phase B
Offset PWM wave forms created when turning the wheel
Index marker pulse
Signal is present only when steering wheel is within 10 degrees either side of center

Output is used to determine Direction of Rotation and Rate of Rotation

Fig 1: Identifying Steering Wheel Position Sensor Digital Signal

Courtesy of GENERAL MOTORS CORP.

Fig 2: Identifying Steering Wheel Position Sensor A And B Phase

Courtesy of GENERAL MOTORS CORP.