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Network Message Chart

Module Network Input Messages - Powertrain Control Module (PCM) 

Broadcast Message Originating Module Message Purpose
Air Conditioning (A/C) request HVAC control module This message requests the A/C compressor to be engaged.
Ambient air temperature IPC This message contains raw value from the Ambient Air Temperature (AAT) sensor.
Evaporator temperature IPC This message contains the evaporator temperature. The PCM uses the evaporator temperature to cycle the A/C compressor clutch.

Module Network Input Messages - Heating, Ventilation, and Air Conditioning (HVAC) Control Module 

Broadcast Message Originating Module Message Purpose
Ambient air temperature IPC This message contains raw value from the Ambient Air Temperature (AAT) sensor.
Evaporator temperature IPC This message contains the evaporator temperature information.