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

Antilock Brake System Wiring


Object Number: 211884  Size: LF
(1)Wheel Speed Sensor, RH
(2)Wheel Speed Sensor, LH
Figure 2:

Undercarriage Wiring


Object Number: 374544  Size: LF
(1)Electronic Brake Control Module (EBCM) Connector (C3)
(2)Brake Pressure Warning Switch
(3)EBCM Connector (C2)
(4)EBCM Connector (C1)
(5)S126
(6)S129
(7)S127
(8)G302
(9)Fuel Pump and Level Sender Connector
(10)Evaporative Emission Canister Vent Valve