Cooling Fan Control
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The Automatic Temperature Control Module (ATCM) determines the amount of condenser cooling required from the refrigerant pressure sensor, since there is a direct relationship between the temperature and pressure of the refrigerant. The cooling requirement is broadcast on the High Speed (HS) Controller Area Network (CAN) Power Mode Zero bus. This message is transmitted through the Body Control Module/Gateway Module (BCM/GWM), onto the HS CAN Powertrain bus to the Powertrain Control Module (PCM). The PCM then controls the temperature of the condenser using the cooling fan(s).