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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The Problem: Increase In Control Module Variations




THE PROBLEM: Increase in Control Module Variations

Factory coding worked very well in the beginning but as the control Systems became more complex, and government influence regarding emission and safety issues increased, the number of control module variations increased dramatically.

Bulging Parts Inventories







The early method of factory coding also required the dealership to have available control modules on hand in the event of an immediate need.

Today the cost for dealership control module inventory would be extremely high if the previous factory coding methods where still practiced.