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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Checking Ground Terminals



Checking Ground Terminals







- Ignition off.
- Control module disconnected.
- Turn of all equipment in the car that takes power from the battery (the interior lighting and radio etc).

Connect an ohmmeter between #53 on the breakout box and the battery negative terminal.

The ohmmeter should read approximately 0 Ohm.

OK: Refer to Checking Control Module Power Supply. Checking Control Module Power Supply
NOT OK: Refer to Checking For an Open-Circuit. Contact Resistance and Oxidation. Checking For an Open-Circuit, Contact Resistance and Oxidation