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

Behind the Front Grille, at the Center of the Radiator Core Support


Object Number: 524983  Size: LF
(1)Hood Ajar Switch (Export)
(2)Night Vision Camera
(3)Ambient Air Temperature Sensor
Figure 2:

Center Rear of the Rear Compartment Lid


Object Number: 524876  Size: LF
(1)Rear Compartment Lid Release Actuator
(2)Rear Comparment Lid Tamper Switch
Figure 3:

Left Front of the Passenger Compartment, in the Steering Column


Object Number: 525021  Size: LF
(1)Ignition Switch
(2)Theft Deterrent Control Module
(3)Ignition Lock Cylinder Control Actuator