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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Control Unit: Service and Repair




1. Remove the ECM cover.
2. Remove the ATTS control unit from the ECM cover.
3. Install the ATTS control unit in the reverse order of removal. Make note of the following items.
- Perform the writing of steering angle sensor neutral position.
- Perform the ATTS function test .