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

TCM Power, Grounds, Class 2 and Range Indicator


Object Number: 639053  Size: FS
Automatic Transmission Schematics TCM, PRNDL Module
Important Icon
Power, Grounds, CAN Bus, and Keyword Serial Data
Extended Travel Brake Switch, ECT and MAF/IAT Sensors
Underhood Fuse Block - STARTER and IGN-1 Relays, CLUTCH, TCM/IPC, WASH NOZ, TURN SW, and HEATER VALVE Fuses
Figure 2:

Transmission Sensors and Solenoids


Object Number: 639054  Size: FS
OBD II Symbol Description Notice