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

Module Power, Ground, Serial Data and Stop Lamp Signal


Object Number: 1845265  Size: FS
Master Electrical Component List
Electronic Component Description
Control Module References
Pressure Controls - 1 of 2 and 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:

Pressure Controls - 1 of 2 and Shift Controls


Object Number: 1845268  Size: FS
Master Electrical Component List
Electronic Component Description
Control Module References
Pressure Controls - 2 of 2 and Speed Sensors
Module Power, Ground, Serial Data and Stop Lamp Signal
Figure 3:

Pressure Controls - 2 of 2 and Speed Sensors


Object Number: 1845269  Size: FS
Master Electrical Component List
Electronic Component Description
Control Module References
Transmission Range Signals and Driver Shift Request
Pressure Controls - 1 of 2 and Shift Controls
Figure 4:

Transmission Range Signals and Driver Shift Request


Object Number: 1845271  Size: FS
Master Electrical Component List
Electronic Component Description
Control Module References
Pressure Controls - 2 of 2 and Speed Sensors
Cruise Control Schematics
High Speed Bus - 1 of 3
High Speed Bus - 1 of 3
G201 2 of 2