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

Left Rear of Engine Compartment


Object Number: 1685114  Size: MF
(1)Brake Fluid Level Switch
(2)Electronic Brake Control Module (EBCM)
Figure 2:

Wheel Speed Sensors


Object Number: 1685115  Size: MF
(1)Wheel Speed Sensor (WSS) - RF
(2)Wheel Speed Sensor (WSS) - RR
(3)Wheel Speed Sensor (WSS) - LR
(4)Wheel Speed Sensor (WSS) - LF