Engine Control Module (ECM)
The ECM controls the coil circuit of the A/C compressor clutch relay. When the ECM senses ground through the A/C on input circuit, it grounds the coil circuit of the A/C compressor clutch relay.
The ECM controls the coil circuit of the A/C compressor clutch relay. When the ECM senses ground through the A/C on input circuit, it grounds the coil circuit of the A/C compressor clutch relay.