B1 Check Continuity of Circuits 518 and 519

- Turn ignition switch to the OFF position.

Anti-Lock Module:

- Disconnect 55-pin plug from anti-lock brake control module.

Break Out Box:

- Connect Rotunda EEC-IV Breakout Box 014-00322 with Anti-Lock Test Adapter T90P-50-ALA or equivalent to the Anti-Lock 55-pin plug on the wiring harness.

- Check continuity between breakout box pins 28 and 60.

- Is continuity present?

YES -- Go to B2. B2 Check LH Rear Sensor to Ground

NO -- Go to B3. B3 Check Continuity of Circuits 523 and 524