GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2002 🢒 DeVille 🢒 Body and Accessories 🢒 Cellular Communication 🢒 OnStar Schematics
Figure 1:

Power, Ground and OnStar Keypad
Object Number: 799552 Size: FS
Master Electrical Component List
OnStar Description and Operation
Microphone, Audio Amplifier and Antenna
DIMR and Audio Fuses
Class 2 Serial Data (3 of 3)
G402 1 of 2
DIMR and Audio Fuses
G401
G401
G402 1 of 2
Figure 2:

Microphone, Audio Amplifier and Antenna
Object Number: 799553 Size: FS
Master Electrical Component List
OnStar Description and Operation
Power, Ground, and OnStar Keypad
Vehicle Communication Interface Module (VCIM) Microphone, Audio Amplifier
Cellular Communication Schematic Icons
Vehicle Communication Interface Module (VCIM) Microphone, Audio Amplifier
Cellular Communication Schematic Icons
Domestic Microphone
G300,G303,G304,G306