GM Service Manual Online
For 1990-2009 cars only
Figure 1:

Steering Column


Object Number: 900962  Size: MF
(1)Ignition Switch
(2)Passlock Sensor
(3)Ignition Key Alarm Switch
(4)Ignition Lock Cylinder Control Solenoid
(5)Steering Column
Figure 2:

Passlock Sensor


Object Number: 1167360  Size: MF
(1)Passlock Sensor
(2)Ignition Key