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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Electronic Car Immobilization System



Comparison images EWS oscilloscope measurement

IMPORTANT: During the measurement, the DME/DDE must be connected.







Bear in mind that the statement "OK" only refers to the data line and the signal form. It is unable to determine whether the transmitted code is correct.







The above signal indicates a fault in the DME/DDE.







The above signal indicates that the electronic vehicle immobilizer is not isolated or that there is a short to positive.







The above signal indicates a short circuit to ground or an open circuit.