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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Check Ground Points




Check Ground Points







- Ignition off.
- Connect breakout box 981 3190 with adapter 981 3194 to 16-pin yellow (or green) connector (output 31-46).
- Measure with ohmmeter between battery negative pole and:
- connection 36 on breakout box.
- connection 37 on breakout box.

In both cases the ohmmeter should read 0 [ohm].

OK - Calibrating Ground Terminals, Continued. Calibrating Ground Terminals, Continued

Not OK - Checking For an Open-Circuit. Checking For an Open-Circuit