Check wiring loom, especially on all the connectors from Fuse Box to ABS unit. Most of the time is one of the connectors corroded off.
If nothing found visually, you HAVE to check for power and ground at the ABS pump before u condemn the ABS unit.
75% of the time this is a Wiring problem instead of the ABS unit failure. Mainly pay attention under the Fuse box.
The wiring loom runs under the Battery, and you have to remove the battery and battery tray to gain access to check the ABS unit. I recommend you to remove battery, put it aside, and use a remote jump cable to power vehicle for testing.
Of course, check for blown/missing fuse.
Last edited by steak59; 12-26-2011 at 11:25 PM.