Control System Logic

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

• HVAC control module (DATC)
• FDIM (part of APIM)

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

The HVAC control module requires PMI when it is replaced.