GM Service Manual Online
For 1990-2009 cars only

Problem

Action

The ignition switch is not set correctly.

Adjust or replace the ignition switch.

Refer to Ignition and Key Alarm Switch Assembly - Disassemble - Off Vehicle and Ignition and Key Alarm Switch Assembly - Assemble - Off Vehicle .

The lock cylinder is faulty.

Refer to Steering Column Lock Cylinder Set - Off Vehicle .