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

Module Power, Ground and Serial Data


Object Number: 1845255  Size: FS
Master Electrical Component List
Electronic Component Description (TCM)
Control Module References
Shift Controls
RUN/CRANK BUS - AIRBAG IGN, MISC IGN and SEO/ALC Fuses
Stop Lamp Controls and CHMSL
RUN/CRANK BUS - ECM-IGN and TRANS IGN 1 Fuses
ECM-BATT, HDLP WASH, HVAC BATT, IPC, LTR, S/ROOF and TCM-BATT Fuses
Stop Lamp Controls and CHMSL
Accessory Wakeup Serial Data
G102, G107 (4.3L), G104, G108
G106 (4.3L) and G103
High Speed Bus - 1 of 3
Figure 2:

Shift Controls


Object Number: 1845257  Size: FS
Master Electrical Component List
Electronic Component Description (TCM)
Control Module References
Pressure and Temperature Controls
Module Power, Ground and Serial Data
Module Power, Ground and Serial Data
RUN/CRANK BUS - ECM-IGN and TRANS IGN 1 Fuses
Figure 3:

Pressure and Temperature Controls


Object Number: 1845258  Size: FS
Master Electrical Component List
Electronic Component Description (TCM)
Control Module References
PNP Signals, VSS Signal and Tow/Haul Signal
Shift Controls
Figure 4:

PNP Signals, VSS Signal and Tow/Haul Signal


Object Number: 1845259  Size: FS
Master Electrical Component List
Electronic Component Description (TCM)
Control Module References
Pressure and Temperature Controls
Low Speed Bus - 1 of 3
G106 (4.3L) and G103
G201 2 of 2