Circuit/System Verification
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Ignition ON, observe the scan tool Driver Seat and Lumbar position sensor parameters. The readings should be between 0.27-2.65 volts and change while adjusting seat and lumbar positions.