A2 Determine Whether Cause Is Control Module or Wiring

- Install 60-pin breakout box. Make sure the correct Econoline 4WABS overlay is installed.

- Jumper breakout box Pin 20 (lamp ground) to Pin 23 (amber ABS warning lamp input).

- Key On for 5-10 seconds.

- Key Off.

- Did the amber ABS warning lamp come On?

YES -- The amber ABS warning lamp comes On brightly. Go to A3.

YES -- The amber ABS warning lamp comes On but only dimly. Resistive short to B+ has been detected in Circuit 603 (DG). Repair wiring fault or repair wiring fault in 14401 harness. Go to A4 to verify concern is resolved.

NO -- Short to B+ in Circuit 603 (DG) has been detected. Find and repair wiring fault. Inspect amber ABS warning lamp fuse. Replace if necessary. Go to A4 to verify concern is resolved.