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

Power, Ground, DLC, Indicators, Sensors, and References
Object Number: 2035046 Size: FS
Master Electrical Component List
SIR System Description and Operation
Control Module References
Deployment Loops
Master Electrical Schematic Icons
Power Moding
Power Moding
Power, Ground, Class 2, and GM Low Speed Serial Data (CAN A)
Power, Ground, Class 2, and GM Low Speed Serial Data (CAN A)
Seat Belt
G302 and G303
Figure 2:

Deployment Loops
Object Number: 2035047 Size: FS
Master Electrical Component List
SIR System Description and Operation
Control Module References
Passenger Presence System
Power, Ground, DLC, Indicators, Sensors, and References
Master Electrical Schematic Icons
Figure 3:

Passenger Presence System
Object Number: 2035050 Size: FS
Master Electrical Component List
SIR System Description and Operation
Control Module References
Deployment Loops
Master Electrical Schematic Icons
Fuse Block - Rear F40, F39, F14, F16, F17, F18 and F12 Fuses
Seat Belt
G201 and G202
G201 and G202
G302 and G303