Circuit Description

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

This circuit monitors the rear position sensor signals for an out-of-specified operating range in IGNITION and RUN. The rear wheel position sensor has 2 signal circuits: position 1 and position 2. Position 1 is a linear measurement of voltage per degree. The voltage range for position 1 is from 0.25 to 4.75 volts, and the angular measurement range is from - 600° to + 600 °. At 0.25 volts the steering wheel has been rotated - 600 ° past center. At 4.75 volts the steering wheel has been rotated + 600 ° past center.

Position 2 circuit is a linear measurement of voltage per degree. The voltage for position 2 increases or decreases from 0.25 to 4.75 volts every 180 °, which is a half steering wheel rotation. When the steering wheel is 0° or at center, position 1 and position 2 output signals measure 2.5 volts respectively.