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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Control Module: Testing and Inspection




Part 1 Of 2:




Part 2 Of 2:






1. Turn the ignition switch to ON. Measure the 4WD control module terminal voltages, referring to the Terminal voltage chart.
2. If not as specified, check, repair, or replace the component(s), wiring, and/or 4WD control module.