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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ROC3 Check SIG Wire For Open



- Key OFF.

- Install Breakout Box (leave the PCM disconnected).

- Remove the relay in question.

- Measure the resistance between SIG BOB Pin and the SIG wire at the relay connector.

- Is the resistance less than 5 ohms?

YES -- REPLACE the relay in question.

NO -- SERVICE the SIG wire for open.