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)

Or, hide this message: temporarily or permanently

Electrical Diagrams




HVAC Schematics

Power, Ground, Controls and Serial Data





Automatic HVAC Description and Operation
A/C Compressor Controls

A/C Compressor Controls





Automatic HVAC Description and Operation
Blower Motor Controls
Power, Ground, Controls and Serial Data

Blower Motor Controls





Automatic HVAC Description and Operation
Temperature, Air Quality, Ambient Light and Sunload Sensors
A/C Compressor Controls

Temperature, Air Quality, Ambient Light and Sunload Sensors





Automatic HVAC Description and Operation
Air Delivery and Temperature Controls (1 of 2)
Blower Motor Controls

Air Delivery and Temperature Controls (1 of 2)





Automatic HVAC Description and Operation
Air Delivery and Temperature Controls (2 of 2)
Temperature, Air Quality, Ambient Light and Sunload Sensors

Air Delivery and Temperature Controls (2 of 2)





Automatic HVAC Description and Operation
Air Delivery and Temperature Controls (1 of 2)