GM Service Manual Online
For 1990-2009 cars only

Problem

Action

The ignition switch is not set correctly.

Adjust 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.

Replace the lock cylinder. Refer to Steering Column Lock Cylinder Set - Disassemble - Off Vehicle and Steering Column Lock Cylinder Set - Assemble - Off Vehicle .