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

OnStar System


Object Number: 823641  Size: LF
(1)Headliner Wiring Harness
(2)Cellular Telephone Microphone
(3)OnStar Button Assembly
(4)Cellular Telephone Antenna
(5)Navigation Antenna
(6)Vehicle Communications Interface Module (VCIM)
(7)Body Wiring Harness
Figure 2:

Left Side of the Luggage Compartment Components


Object Number: 911116  Size: MF
(1)Body Wiring Harness
(2)Vehicle Communications Interface Module (VCIM)
(3)Cellular Telephone Antenna Connection
(4)Vehicle Communications Interface Module (VCIM) C1, C2
(5)Navigation Antenna Connection
Figure 3:

Left Side of Rear Window Shelf


Object Number: 885618  Size: MF
(1)Cellular Antenna Connector
(2)C404
(3)Body Wiring Harness
(4)C403
(5)Navigation Antenna Connector