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

Rear Headliner Components


Object Number: 1539219  Size: LF
(1)Roof Rail Reading Lamp - Left
(2)Cargo Lamp
(3)Rear Parking Assist (RPA) Display (UD7)
(4)Roof Rail Reading Lamp - Right
Figure 2:

Right Rear Cargo Components - Body Harness


Object Number: 1536111  Size: LF
(1)Speaker - Rear Tweeter - Right
(2)Accessory AC/DC Power Control Module (KC7)
(3)C420 Rear Parking Assist Display Jumper Harness to Body Harness (UD7)
(4)Rear Quarter Window Actuator - Right (A20)
(5)C402 and C400 Liftgate Harness to Body Harness
(6)Rear Parking Assist (RPA) Display (UD7)
(7)G400
(8)Auxiliary Power Outlet - 115VAC (KC7)
(9)Sliding Door Jamb Switch - Right
(10)Rear Object Sensor Control Module (UD7)
(11)Rear Parking Assist (RPA) Diagnostic Connector (UD7)
Figure 3:

Rear Fascia Exterior Lighting


Object Number: 1535971  Size: LF
(1)Center High Mounted Stop Lamp (CHMSL)
(2)Tail Lamp - Right
(3)Tail/Stop and Turn Signal Lamp - Right
(4)Backup Lamp - Right
(5)License Lamps
(6)Object Sensor - RR Corner (UD7)
(7)Object Sensor - RR Middle (UD7)
(8)Object Sensor - LR Middle (UD7)
(9)Object Sensor - LR Corner (UD7)
(10)Backup Lamp - Left
(11)Tail/Stop and Turn Signal Lamp - Left
(12)Tail Lamp - Left
(13)CHMSL Resistor (R900)