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

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Control Module Ground


General





The control module is grounded through pin 31 and pin 32 to grounding point G38.
The grounding points are connected internally.

Diagnostics





If there is no ground connection, communication with the TCM will not be possible. No diagnostic trouble code is generated. TCM in Limp-Home mode.