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

Right Rear of Vehicle, Front of Wheelhouse


Object Number: 731955  Size: LF
(1)Rear Object Sensor Control Module
(2)Rear Parking Assist Diagnostic Connector
(3)Sliding Door Jamb Switch - Right
Figure 2:

Rear of Vehicle, Center of Roof


Object Number: 731968  Size: LF
(1)Rear Parking Assist (RPA) Display