Test Description
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.
The number below refers to the step number on the diagnostic table.
3. Tests for the proper operation of the 12V reference Security Sensor Power circuit, sensor ground circuit, and Passlock™ sensor signal (data) circuit. Troubleshoot the appropriate DTC prior to diagnosing DTC B3031.