Steering Wheel Position Sensor - Digital Signal

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 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

Courtesy of GENERAL MOTORS CORP.

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

Courtesy of GENERAL MOTORS CORP.

Fig 3: Steering Wheel Position Sensor - Analog Signal

Courtesy of GENERAL MOTORS CORP.