Pcm (ECM/TCM)
WARNING: This page is about a different car, the 2021 Hyundai Kona. However, it is still accessible from the selected car via links, so may be relevant.
 Courtesy of HYUNDAI MOTOR AMERICA
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The A/C Control Unit (Module) receives the engine RPM signal from the engine ECU through CAN communication lines and carries out variable control over the compressor according to the engine loads.