Circuit Description
WARNING: This page is about a different car, the 2007 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
Steering angle centering is the process which calibrates the steer sensor output so that it reads 0 when the steering wheel is centered, using data from the yaw rate sensor, lateral accelerometer and wheel speeds. Under normal circumstances steer angle centering occurs after approximately 10 seconds of driving in a straight line on a fairly level surface (i.e. a typical road) at > 10 KPH.
The usable output voltage range for the lateral accelerometer and yaw rate sensors is 0.25-4.75 volts. The scan tool will report zero lateral acceleration or yaw rate as 2.5 volts with no sensor bias present. The sensor bias compensates for sensor mounting alignment errors, electronic signal errors, temperature changes, and manufacturing differences.