E3 Check Circuit 539 to Ground

- Turn ignition switch to the OFF position.

Anti-Lock Control Module:

- Disconnect anti-lock brake wiring plug from anti-lock brake control module.

Breakout Box:

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

- Check for continuity between breakout box pins 15 and 60.

- Is continuity present?

YES -- Go to E4. E4 Check Circuit 539

NO -- Go to E5. E5 Check Anti-Lock Brake Control Module