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 a function request message over the HS-CAN3 to the GWM. The GWM sends the message to the FCIM over the Medium Speed Controller Area Network (MS-CAN). The GWM sends the requests to the PCM over the High Speed Controller Area Network (HS-CAN)1. 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 Medium Speed Controller Area Network (MS-CAN). The GWM sends the request to the PCM over the High Speed Controller Area Network (HS-CAN)1. The PCM controls the A/C clutch relay.

The FCIM requires Programmable Module Installation (PMI) when it is replaced.