GM Service Manual Online
For 1990-2009 cars only

OnStar Schematics F1

Figure 1:

Power and Ground


Object Number: 814953  Size: FS
Master Electrical Component List
Keypad Microphone Signals
Serial Data Class 2
G401 (2 of 2)
Battery Feed to the Fuse Block-Rear
Battery Feed to the Fuse Block-Rear
G303, G305, G310 and G404
Figure 2:

Keypad Microphone Signals


Object Number: 797928  Size: FS
Master Electrical Component List
Power and Ground
G402
G402
Cellular Communication Schematic Icons

OnStar Schematics 2.6

Figure 1:

Power and Ground


Object Number: 625376  Size: FS
Master Electrical Component List
Keypad Microphone Signals
Battery Feed to the Fuse Block-Rear
Battery Feed to the Fuse Block-Rear
G303, G305, G310 and G404
Serial Data Class 2
G401 (2 of 2)
Figure 2:

Keypad Microphone Signals


Object Number: 816764  Size: FS
Master Electrical Component List
VIU and VCU Signals
Power and Grounds
Cellular Communication Schematic Icons
G402
G402
Figure 3:

VIU and VCU Signals


Object Number: 694103  Size: FS
Master Electrical Component List
Keypad Microphone Signals
G303, G305, G310 and G404
Cellular Communication Schematic Icons