G5 Check Grounds at Control Module

- Key OFF.

- Anti-lock brake control module disconnected.

- Measure the resistance between pin 3 terminal ("BK") of the anti-lock brake control module connector C1 and ground and pin 8 terminal ("BK") of the anti-lock brake control module connector C1 and ground at the anti-lock brake control module.

- Are the resistances less than 5 ohms?

YES -- Replace the anti-lock brake control module.

NO -- Service the "BK" wire(s) to ground and/or replace the joint connector in question.