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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Twice, Immobilization



TWICE, Immobilization







As standard, the car is fitted with a system that prevents the car from being started without the correct key. There is a transponder in the key with an identification code that is unique for that particular transponder. A receiver fitted round the ignition switch receives the transponder's identification code and sends it on to TWICE, which recognizes the car's transponders. In the event of an incorrect transponder being used, TWICE outputs an error message on the bus.

For more information about the TWICE control module, see System overview, TWICE.

For more information about Immobilization, see System overview, immobilizer.