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

Brake Switch Signal and Valve Controls


Object Number: 744381  Size: FS
Master Electrical Component List
Electronic Component Description
TFT Sensor, Pressure Control Solenoid, and ISS Sensor
OBD II Symbol Description Notice
IGNITION, RUN, ACCESSORY, and RAP Bus Bars, RAP #1 and RAP #2 Fuses
RTD, RDO AMP, CRANK, and IGN 0 Fuses
Cruise Control Module (CCM), Clutch Pedal Position (CPP) Switch, Stoplamp Switch
Power, Ground, Serial Data - w/o Traction Assist
Figure 2:

TFT Sensor, Pressure Control Solenoid, and ISS Sensor


Object Number: 744383  Size: FS
Master Electrical Component List
Electronic Component Description
Park/Neutral Position (PNP) Switch
Brake Switch Signal and Valve Controls
OBD II Symbol Description Notice
Engine Data Sensors - Pressure and Temperature
Figure 3:

Park/Neutral Position (PNP) Switch


Object Number: 744384  Size: FS
Master Electrical Component List
Electronic Component Description
Vehicle Speed Signal and 4WD Low Signal
TFT Sensor, Pressure Control Solenoid, and ISS Sensor
OBD II Symbol Description Notice
SP205
G203 - 3 of 4 - Base Pickup
G203 - 3 of 4 - Base Pickup
G203 - 1 of 4
G103 and G105 - Gas
Figure 4:

Vehicle Speed Signal and 4WD Low Signal


Object Number: 744389  Size: FS
Master Electrical Component List
Electronic Component Description
Park/Neutral Position (PNP) Switch
OBD II Symbol Description Notice