Control System Logic

The climate control system controls are in one or more locations depending on vehicle option content:

• FCIM (Dual Automatic Temperature Control (DATC) system)
• FDIM (part of APIM)

When the FDIM touchscreen or voice commands are used and A/C is selected, the APIM sends the request message over the HS-CAN3 to the GWM. The GWM relays the request to the FCIM over the MS-CAN, and the GWM sends the request to the PCM over the HS-CAN1. The PCM controls the A/C clutch relay.

When the customer directly inputs an A/C request into the FCIM, the module sends the request to the GWM over the MS-CAN, and the GWM sends the request to the PCM over the HS-CAN1. The PCM controls the A/C clutch relay.