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

Steering Column


Object Number: 327480  Size: LF
(1)Automatic Transmission Shift Lock Control Solenoid (BTSI)
Figure 2:

Center of Floor Console


Object Number: 593538  Size: LF
(1)Performance Shift Switch
(2)Automatic Transmission Control Position Indicator Bulb
(3)Automatic Transmission Control Switch (BTSI)
(4)C325