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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Checking Fan Control Current




Checking Fan Control Current







Unplug the connector:
- Ventilation fan control (220)







Connect a voltmeter.












Connect the test probes as follows:
Ventilation fan control (220) 8
Car battery (1) B-












- Turn the ignition switch to the ON position.
- Increase fan speed step by step on the ACC/MCC panel.
- The voltmeter should read 0-5 V in short steps from minimum to maximum fan speed.

Is the function correct?

NO - Rectifying the Lead - II

YES - Changing Components - I