Control System Logic

When the Information and Entertainment Display Unit 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 relays the request to the HVAC 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.

The HVAC control module requires a Programmable Module Installation (PMI) when it is replaced.