Steering Wheel Position Sensor - Digital Signal

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

3 outputs used (Phase A, Phase B, Index Pulse)
Phase A & Phase B. Offset PWM wave forms created when turning the wheel
Index 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: Steering Wheel Position Sensor - Digital Signal Chart

Courtesy of GENERAL MOTORS CORP.

Fig 2: Steering Wheel Position Sensor - A & B Phase Chart

Courtesy of GENERAL MOTORS CORP.

Fig 3: Steering Wheel Position Sensor - Analog Signal Chart

Courtesy of GENERAL MOTORS CORP.