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

Rear Window Shelf


Object Number: 1906105  Size: LF
(1)Speaker - Left Rear
(2)Audio Amplifier (U87)
(3)Electronic Compass Module
(4)Digital Radio/Navigation Antenna (U2K/UE1)
(5)Rear Compartment Courtesy Lamp
(6)Speaker - Right Rear
(7)Digital Radio Receiver (U2K)
Figure 2:

Rear of the Vehicle


Object Number: 1906232  Size: LF
(1)Center High Mounted Stop Lamp (CHMSL)
(2)Rear Window Defogger Grid
(3)Tail Lamp - Right
(4)Marker Lamp - Right Rear
(5)Tail/Stop and Turn Signal Lamp - Right
(6)Backup Lamp - Right
(7)License Lamp - Right
(8)License Lamp - Left
(9)Backup Lamp - Left
(10)Tail/Stop and Turn Signal Lamp - Left
(11)Marker Lamp - Left Rear
(12)Tail Lamp - Left