Circuit/System Verification
WARNING: This page is about a different car, the 2008 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
Ignition ON, observe the scan tool Wheel Speed Sensor parameter while driving, the vehicle in a straight line at a speed greater than 8 km/h (5 mph), all wheel speed sensor scan tool readings should read the same speed.