Test Procedure

WARNING: This page is about a different car, the 2003 Cadillac Seville and 2003 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.

Install a scan tool.
With a scan tool, select the Service Bay Test in the special functions menu.
Follow the instructions on the scan tool.
Check DTCs with a scan tool.
Continue with the published service manual diagnostic DTC procedure. See DIAGNOSTIC TROUBLE CODE INDEX table under DIAGNOSTIC TROUBLE CODE DEFINITIONS.