C4 Check Left Front Brake Sensor Circuits

- Remove cover from hydraulic control unit.

- Disconnect jumper harness from anti-lock brake control module.

- Check for a short between pin 4 of the 15-pin connector to ground.

- Check for a short between pin 12 of the 15-pin connector to ground.

- Does a short to ground exist at either of the two pins?

YES -- Service or replace jumper, circuit 521 or 522, or left front brake anti-lock sensor.

NO -- Go to C5. C5 Check Left Front Sensor Air Gap