GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2002 🢒 Montana 🢒 Transmission/Transaxle 🢒 Automatic Transaxle - 4T65-E 🢒 Cellular Communication Component Views
Figure 1:

Front Center of Roof in Overhead Console
Object Number: 734455 Size: SH
(1)OnStar® Button Assembly
(2)Cellular Telephone Microphone
(3)GPS Antenna
Figure 2:

Under Driver Side of the IP
Object Number: 734456 Size: SH
(1)Vehicle Communications Unit (VCU)
(2)Vehicle Interface Unit (VIU)