GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Oldsmobile 🢒 2004 🢒 Silhouette Ext. 🢒 Accessories 🢒 Cellular Communication 🢒 OnStar Schematics
Figure 1:

Onstar Power and Grounds
Object Number: 857920 Size: FS
Master Electrical Component List
OnStar Description and Operation
Onstar Inputs and Outputs
BATT Main 1 and Fuse Block - I/P Fuses
Data Link Connector (DLC) Schematics
Key Cylinder Switches
G200, Page 3 of 3
Figure 2:

Onstar Inputs and Outputs
Object Number: 857927 Size: FS
Master Electrical Component List
OnStar Description and Operation
Onstar Power and Ground