Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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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.