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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Signal Description, Central Electronic Module (CEM)






Signal specification





Note! It is important to connect the breakout box and check the ground terminals before taking readings.

Other information
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- To check ground terminals, see Checking the ground terminal Checking the Ground Terminal, Central Electronic Module (CEM).