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

Valve Controls and Brake Switch


Object Number: 744394  Size: FS
Master Electrical Component List
Electronic Component Description
Switch Inputs
Automatic Transmission Schematic Icons
Stop Lamp Switch Inputs and Vehicle Speed Signal (w/o ETC)
BRAKE, CRUISE, HTR A/C, RR WPR, WS WPR, and SEO ACCY Fuses
RTD, RDO AMP, CRANK, and IGN 0 Fuses
Power, Ground, Class 2 Communication - w/o Traction Assist
Figure 2:

Switch Inputs


Object Number: 744395  Size: FS
Master Electrical Component List
Electronic Component Description
Tow/Haul Switch and PNP Switch Inputs
Valve Controls and Brake Switch
Automatic Transmission Schematic Icons
Engine Data Sensors - Electronic Throttle Controls, TAC Motor and TP Sensor
Figure 3:

Tow/Haul Switch and PNP Switch Inputs


Object Number: 744384  Size: FS
Master Electrical Component List
Electronic Component Description
Vehicle Speed Signal and 4WD Low Signal
Switch Inputs
Automatic Transmission Schematic Icons
Splice Pack SP205
G203 - 3 of 4
G203 - 3 of 4
G203 - 1 of 4
G103, G105, and G106
Figure 4:

Vehicle Speed Signal and 4WD Low Signal


Object Number: 744389  Size: FS
Master Electrical Component List
Electronic Component Description
Tow/Haul Switch and PNP Switch Inputs
Automatic Transmission Schematic Icons