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

Power, Ground, and Stop Lamp Switch TCC Signal Circuit


Object Number: 866598  Size: FS
Master Electrical Component List
Electronic Component Description
Serial Data, Tow/Haul Switch, and Torque Signals
OBD II Symbol Description Notice
Ignition, Run and Start Bus Bar
BRAKE, HTR A/C, HVAC I
Ignition, Run, Start, Accy Bus Bar
IGN 0 , TBC IGN 0, TBC ACCY, SEO ACCY, W/S WIPER, RR WIPER
B+ Bus Bar (Gas) - 1 of 3
LH HID, RH HID, PCM B, CRANK, HORN, SIR
BRAKE, HTR A/C, HVAC I
IGN 0 , TBC IGN 0, TBC ACCY, SEO ACCY, W/S WIPER, RR WIPER
BRAKE, HTR A/C, HVAC I
BRAKE, HTR A/C, HVAC I
G102, G103-Gas
G102, G103, G108, and G109 - Diesel
Figure 2:

Serial Data, Tow/Haul Switch, and Torque Signals


Object Number: 866601  Size: FS
Master Electrical Component List
Electronic Component Description
CAN Serial Data, VSS, and PNP Switch
Power, Ground, and Stop Lamp Switch TCC Signal Circuits
OBD II Symbol Description Notice
Transfer Case Schematics - NP1
Power, Ground, Class 2, and Transfer Case Encoder Motor
SP205 - 1 of 2
Figure 3:

CAN Serial Data, VSS, and PNP Switch


Object Number: 1201439  Size: FS
Master Electrical Component List
Electronic Component Description
Speed Sensors, Trim B and Shift Solenoids
Serial Data, Tow/Haul Switch, and Torque Signals
OBD II Symbol Description Notice
MIL Control and Serial Data
Transmission Controls - A/T
Transmission Controls - A/T
G102, G103-Gas
G102, G103, G108, and G109 - Diesel
Figure 4:

Speed Sensors, Trim B and Shift Solenoids


Object Number: 866603  Size: FS
Master Electrical Component List
Electronic Component Description
TCC PWM and Trim A Solenoids, Pressure Switches, and TFT Sensor
CAN Serial Data, VSS, and PNP Switch
OBD II Symbol Description Notice
Figure 5:

TCC PWM and Trim A Solenoids, Pressure Switches, and TFT Sensor


Object Number: 866606  Size: FS
Master Electrical Component List
Electronic Component Description
Speed Sensors, Trim B and Shift Solenoids
OBD II Symbol Description Notice