Control System Logic
WARNING: This page is about a different car, the 2017 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
When the customer directly inputs an A/C request into the FCIM, the module sends the request to the GWM over the MS-CAN. The GWM sends the request to the PCM over the HS-CAN. The PCM controls the A/C clutch relay.
The FCIM Programmable Module Installation (PMI) when it is replaced.