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

Overhead Console


Object Number: 1495835  Size: MF
(1)Cellular Microphone
(2)Overhead Console
Figure 2:

Vehicle Communication Interface Module (VCIM)


Object Number: 825916  Size: MF
(1)Connectors
(2)Body Harness
(3)Rear Floor Panel
(4)Vehicle Communication Interface Module (VCIM)