If it's 4WABS, then you're going to need a scan tool.
If it's RWAL (rear only) then you can:
NOTE: Ford DOES NOT provide procedures other than those described to retrieve or clear trouble codes.
NOTE: Verify the ignition switch is in the RUN position (engine does not need to be running). Next, locate the black RABS II diagnostic connector. The diagnostic connector has two mating halves (one of which has a black/orange wire connected to it). Disconnect the two halves.
Attach one end of a jumper wire to the black with orange stripe wire side of the diagnostic connector. Momentarily ground the opposite end of the jumper wire by connecting it to a good chassis ground for 1-2 seconds. Grounding this wire should start the REAR ABS lamp flashing. If grounding this wire does not start the REAR ABS lamp flashing, Go to Diagnosis by Symptom. See: Trouble Code Descriptions
CAUTION: Care must be taken to connect only the black/orange stripe wire to ground. Connecting the mating connector wire to ground will result in a blown fuse.
The code consists of a number of short flashes and ends with a long flash. Count the short flashes and include the following long flash in the count to obtain the code number. For example, three short flashes followed by one long flash indicates diagnostic trouble Code 4. The code will continue to repeat itself until the key is turned off. It is recommended that the code be verified by reading it several times. This code will be used later for system repair instructions. It should be written down for future use. A diagnostic trouble code of 16 will be obtained when the antilock electronic control unit detects normal system operation.
This is directly from ALLDATA
For a RABS system the connector should be located under the right side of the dash.
Once you get codes, let me know what they are and I can point you in the right direction.
Hope this helps
