B1318-2: Check Anti-Lock Brake Module Ground For Open Circuit

- Turn ignition switch to OFF.

- Using an ohmmeter, measure resistance between breakout box pin 1 and a known good ground.

- Is resistance less than 5 ohms?

YES -- Go to B1318-3. B1318-3: Check Anti-Lock Module Power Circuit For Short

NO -- Service circuit 570 (BK/W) for open. Restore vehicle. Retest system.