F4 Check Grounds at ABS Control Module

- Key OFF.

- Anti-lock brake control module connector C1 disconnected.

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

- Are the resistances less than 5 ohms?

YES -- Replace anti-lock brake control module.

NO -- Service the "BK" wire(s) to ground.