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

HVAC Control Module

The HVAC control module is powered up by the ignition 3 voltage circuit. When the air temperature switch is rotated a variable resister in the HVAC control module changes the voltage on the air temperature door control circuit for an actuator position change. The module does not utilize Keep Alive Memory (KAM). The module does not have Class 2 communication, personalization and programming available.