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

Passlock Module


Object Number: 420155  Size: SH
(1)IP Carrier
(2)Passlock Module
(3)Passlock Module Retaining Tab
(4)Passlock Module Bracket
(5)Passlock Module Connector
Figure 2:

Steering Column View


Object Number: 312044  Size: MF
(1)Steering Wheel Mounting Shaft
(2)Ignition Switch
(3)Passlock Sensor
(4)AT Shift Lock Solenoid
(5)Steering Column
(6)Windshield Washer/Wiper Switch
(7)Turn Signal Switch
Figure 3:

Vehicle Immobilizer Module


Object Number: 420158  Size: MF
(1)Vehicle Immobilizer Module