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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Information Bus: Service Precautions

Controller Area Network (CAN) Communication System

Precautions For Trouble Diagnosis / CAN SYSTEM
Do not apply voltage of 7.0 V or higher to the measurement terminals.

Use the tester with its open terminal voltage being 7.0 V or less.







Precautions For Harness Repair / CAN SYSTEM
Solder the repaired parts, and wrap with tape. [Frays of twisted line must be within 110 mm (4.33 in)]






Do not perform bypass wire connections for the repair parts. (The spliced wire will become separated and the characteristics of twisted line will be lost.)