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

Power Ground and Class 2


Object Number: 885734  Size: FS
Master Electrical Component List
OnStar Description and Operation
Keypad Controls
TSIG/HAZ, STOP LP, AUDIO, and CD Fuses
TSIG/HAZ, STOP LP, AUDIO, and CD Fuses
Serial Data Class 2
G303, G305, G310, and G404
G401 - 1 of 2
Figure 2:

Keypad Controls


Object Number: 885735  Size: FS
Master Electrical Component List
OnStar Description and Operation
Power Ground and Class 2
Cellular Communication Schematic Icons
G402
G402