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

TCM and Transmission, Power, Ground, Serial Data, Inputs and Outputs
Object Number: 1990388 Size: FS
Master Electrical Component List
Transmission Component and System Description
Control Module References
NSBU Switch and TOSS Sensor
IGN II/III Bus - Airbag, IGN Engine and Phone/Cruise
ABS Motor, ABS Valves, HVAC Blower, HVAC Batt and TCM Fuses
Batt Main 2, Console Lighting, BCM Logic, Stop Lamps/Park Assist and IGNSW/Theft Fuses and Ignition Switch
Stop Lamps Power and Ground
Body Control Module and Ignition Switch, Power, Ground, Inputs and Outputs
Batt Main 2, Console Lighting, BCM Logic, Stop Lamps/Park Assist and IGNSW/Theft Fuses and Ignition Switch
Automatic Transmission Schematic Icons
Automatic Transmission Schematic Icons
Automatic Transmission Schematic Icons
Automatic Transmission Schematic Icons
G103, G106, G107, G108 and G109 (3.6L)
Figure 2:

NSBU Switch and TOSS Sensor
Object Number: 1990397 Size: FS
Master Electrical Component List
Transmission System Description and Operation
Control Module References
TCM and Transmission, Power, Ground, Serial Data, Inputs and Outputs
Automatic Transmission Schematic Icons
Automatic Transmission Schematic Icons