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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A/C Signal: Description and Operation

OPERATION
- The air conditioning switch applies the battery voltage to the engine control module when the air conditioning is turned on.

- When the air conditioning ON signal is input, the engine control module drives the idle air control motor and turns ON the power transistor. As a result, the air conditioning power relay coil is energized to turn on the relay switch, which activates the air compressor magnetic clutch.