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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Pinout Values and Diagnostic Parameters








HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Manual Air Conditioning System): TERMINALS OF ECU

TERMINALS OF ECU

1. A/C AMPLIFIER




HINT: Check from the rear of the connector while it is connected to the A/C amplifier.













- *1: w/ PTC heater
- *2: w/ Manual System





(a) Waveform 1: