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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Prove Out System

Prior to attempting diagnostic prove out on a serviced vehicle, thoroughly check the air bag Electronic Crash Sensor (ECS) module and wiring for damaged or pinched wires.

After all service, verify the AIR BAG warning indicator. This means turn the ignition switch to RUN and count the flashes. If the AIR BAG warning indicator comes on continuously for six seconds and then goes out, and if no LFCs flash within 30 seconds, the air bag system is functioning properly and all malfunctions have been serviced.