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

Ground, Power, Pump, Indicators, and Traction Control (NW9)
Object Number: 1921506 Size: FS
Master Electrical Component List
ABS Description and Operation
Control Module References
Wheel Speed Sensors
Figure 2:

Wheel Speed Sensors
Object Number: 1921511 Size: FS
Master Electrical Component List
ABS Description and Operation
Control Module References
Driver Inputs and Stability Control Sensors - JL4
Ground, Power, Pump, Indicators, and Traction Control - NW9
Figure 3:

Driver Inputs and Stability Control Sensors (JL4)
Object Number: 1921509 Size: FS
Master Electrical Component List
ABS Description and Operation
Control Module References
Wheel Speed Sensors