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SYSTEM HAC-15 < SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONING] C D E F G H J K L M A B HAC N O P If the engine coolant temperature is 56 °C (133°F) or less, to prevent a cold discharged air flow, A/C auto amp. suspends blower motor activation for the maximum 150 seconds depending on target air mix door opening angle. After this, voltage of blower motor is increased gradually, and blower motor is activated. FAN SPEED CONTROL AT DOOR MOTOR OPERATION When mode door motor is activated while air flow is more than the specified value, A/C auto amp. reduces temporarily fan speed so that mode door moves smoothly. HIGH IN- TEMPERATURE STARTING CONTROL When evaporator temperature is high [intake air temperature sensor value is 35 °C (95°F) or more], to prevent a hot discharged air flow, A/C auto amp. suspends blower motor activation for approximately 3 seconds so that evaporator is cooled by refrigerant. Air Inlet Control INFOID:0000000012200013 • While air inlet is in automatic control, A/C auto amp. selects air inlet (fresh air intake, 20% fresh air intake, or recirculation) depending on set temperature, in-vehicle temperature, and ambi- ent temperature. NOTE: Air inlet is fixed to REC, when the ambient temperature is 21 °C (70 °F) or more. • Air inlet is fixed to 80% FRE, only when the conditions are satisfied as follows: - Air inlet is FOOT or D/F - Ambient temperature is 2 °C (36°F) or less - Maximum fan speed Compressor Control INFOID:0000000012200014 DESCRIPTION • When the compressor activation condition is satisfied while blower motor is activated, A/C auto amp. trans- mits A/C ON signal and blower fan ON signal to BCM. • BCM transmits the A/C ON signal and blower fan ON signal to ECM via CAN communication line. Refer to BCS-12, "SIGNAL BUFFER SYSTEM : System Description" • ECM judges the conditions of each sensor (Refrigerant pressure sensor signal, accelerator position signal, etc.), and transmits the A/C compressor request signal to IPDM E/R via CAN communication line. • By receiving the A/C compressor request signal from ECM, IPDM E/R turns the A/C relay to ON, and acti- vates the compressor. Refer to PCS-7, "RELAY CONTROL SYSTEM : System Description" CONTROL BY A/C AUTO AMP. Low Temperature Protection Control When intake sensor detects that evaporator fin temperature is 2 °C (36 °F) or less, A/C auto amp. requests ECM to turn the compressor OFF, and stops the compressor. When the air temperature returns to 3.5 °C (38°F) or more, the com- pressor is activated. JMIIA1227GB JMIIA0711GB JMIIA1055GB |