SYSTEM OPERATION

- For air flow, the manual selection (1-7 speed) with the fan control dial has priority.
- If the AUTO switch is pressed or if the DEF switch is pressed while in the OFF condition, it changes to the automatic control by A/C auto amp.
- When increasing the air flow, it changes the duty ratio of blower fan motor drive signal to prevent the air flow from suddenly increasing.
- There are the following types of air flow control: starting air flow control, starting air flow control at low coolant temperature, starting air flow control at high interior air temperature, air flow control at door motor operation, and air flow control at voice recognition in addition to manual control, normal automatic air flow control.

AIR FLOW CONTROL
Automatic Air Flow Control

- When the target temperature is set by the temperature control dial of preset switch, the A/C auto amp. performs the calculation and decides the target air flow according to the signal from each sensor.
- The A/C auto amp. changes the duty ratio of the blower motor control signal and controls the air flow continuously so that the air flow becomes the target air flow.
- The minimum air flow will change according to the sunload when the air discharge outlet is VENT or B/L.

Starting Air Flow Control

- When starting the automatic control of air flow, the system gradually increases the duty ratio of the blower motor control signal to prevent too much air from blowing.
- The time period from when the air flow changes from LOW to HI is approximately 8 seconds.
- It becomes the starting air flow control at low coolant temperature according to the calculation result of auto amp and engine coolant temperature [approximately 56°C (133°F) or less] during the automatic air flow control.
- Do not perform the starting air flow control when the air discharge outlet is set to DEF.

Low Coolant Temperature Starting Control

- It stops the blower motor for approximately 150 seconds at the maximum according to the target air mix door position based on the calculation result of A/C auto amp. and engine coolant temperature [approximately 56°C (133°F) or less] when starting the automatic air flow control. Then, it increases the duty ratios gently so as not to blow cold air underfoot.
- Change the increase rate of the duty ratio to the normal automatic air flow control when the engine coolant temperature is approximately 56°C (133°F) or more in the starting air flow control at low coolant temperature.

High In-vehicle Temperature Starting Control
Turn the blower motor to OFF while the evaporator is cooled by the refrigerant (approximately 3 seconds) to prevent the hot air from blowing out when the evaporator temperature is high [approximately 35°C (95°F) or more of intake sensor detection temperature] at starting the blower motor.
Fan Speed Control at Door Motor Operation
When the mode door motor operated at the air flow automatic control, it decreases the air flow of the blower motor once and controls it so that the mode door motor moves smoothly.
Fan Speed Control at Voice Recognition
When the voice command switch is operated at the air flow automatic control, it decreases the air flow of the blower motor once and controls it so as not to disturb the voice recognition function. In addition, this control continues while the voice recognition function is operating.