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

Accessory Signal: Description and Operation

When the electric defog is turned "ON", the defog (heated windshield) controller signals the ECM/PCM. The ECM/PCM responds by modifying the signal to the IAC valve to compensate for the additional charging system load on the engine.