System Logic
WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
The WACM directly sends a charge status message over the HS-CAN3 to the APIM. The signal the APIM receives from the WACM includes information about the state of the WACM: ChargeNotInProgress, ChargeInProgress, Metal ObjectDetected. These are used for the FCIM display messages.