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

Liftgate


Object Number: 863307  Size: LF
(1)Liftgate Latch Assembly
(2)Liftgate
Figure 2:

Rear of Vehicle


Object Number: 828193  Size: LF
(1)Center High Mount Stop Lamp (CHMSL)
(2)Rear Window Defogger Grid
(3)Tail/Stop and Turn Signal Lamp - Right, and Marker Lamp - RR (Left Similar)
(4)Rear Wiper Arm
(5)Backup Lamp - Left, and Backup Lamp - Right
(6)Object Sensor RR Corner
(7)Object Sensor RR Middle
(8)Object Sensor LR Middle
(9)Object Sensor LR Corner
(10)Liftgate Release Switch
(11)Park Lamp - LR Inner, and Park Lamp - LR Outer (Right Similar)
(12)License Lamp - Left, and License Lamp - Right
(13)Cargo Lamp