System Operation: Notes

When A/C switch is pressed, turn fan control dial to ON or set mode control dial to MAX A/C position, A/C amp. transmits A/C switch signal to BCM.

BCM sends A/C switch signal to ECM, via CAN communication.

ECM judges whether compressor can be turned ON, based on each sensor status (refrigerant-pressure sensor signal, throttle angle, etc.). If it judges compressor can be turned ON, it sends A/C compressor request signal to IPDM E/R, via CAN communication.

Upon receipt of A/C compressor request signal from ECM, IPDM E/R turns air conditioner relay ON to operate compressor.