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

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Blower Motor Relay: Testing and Inspection


1. Using an ohmmeter, measure resistance between terminals 1-2, resistance should be approximate 80 ohms.
2. Measured resistance between terminals 3-4, should be infinity.
3. Measured resistance between terminals 3-5, should be zero.
4. If readings obtained are incorrect, replace heater relay.