AIRFLOW MODE CONTROL OPERATION

id074000102900

Airflow Mode Automatic Control

• The climate control unit uses the present opening angle of the air mix actuator and the control condition of the A/C compressor to determine the airflow mode. When the A/C compressor is in OFF mode, the climate control unit varies the determined value of airflow mode according to the temperature signals received from the evaporator temperature sensor.

Correction

Ambient temperature correction (L.H.D. (except intensely hot area))

• To improve windshield and front door glass from fogging, airflow mode is fixed at HEAT/DEF when the ambient temperature is low. However, ambient temperature correction does not operate when the temperature is set at MAX COLD. (temperature setting dial is turned to the left)

Coolant temperature correction

• To prevent uncomfortable draughts of cold air blowing around the driver's feet soon after the engine is started in winter, airflow mode is switched from DEFROSTER to HEAT/DEF to HEAT mode to match the rise in engine coolant temperature. This control only operates when the passenger compartment temperature is below 13°C {55°F}, or when the passenger compartment temperature is below 23°C {73°F} and sunlight intensity is comparatively low.

Fail-safe function

• When the potentiometer of airflow mode actuator is malfunctioning, the airflow mode door is fixed. Under this situation, if the ignition switch is turned to the ON/LOCK position, the airflow mode door is controlled to be fully opened (DEFROSTER) or closed (VENT) based on the ambient temperature. In addition, the door is fully closed (VENT) in the manual VENT, and fully opened (DEFROSTER) in the manual DEFROSTER.

• If the airflow mode doors are locked and the target airflow mode is set by the climate control unit which does not reach to within 9 seconds, the airflow mode actuator drive signal will be stopped to prevent the motor from burning.

Airflow Mode Manual Control

• Airflow can be selected by operating the MODE switch and the DEFROSTER switch.


Airflow mode	Switch operation	Air outlet
VENT	MODE switch set from HEAT/DEF to VENT	CENTER VENT, SIDE VENT
BI-LEVEL	MODE switch set from VENT to BI-LEVEL	CENTER VENT, SIDE VENT, HEAT
HEAT	MODE switch set from BI-LEVEL to HEAT MODE switch set from DEFROSTER to HEAT	SIDE VENT (L.H.D. only), HEAT, REAR HEAT (minimum air from DEFROSTER and SIDE DEMISTER)
HEAT/DEF	MODE switch set from HEAT to HEAT/DEF	SIDE VENT (L.H.D. only), HEAT, REAR HEAT, DEFROSTER, SIDE DEMISTER
DEFROSTER	DEFROSTER switch to ON	SIDE VENT (L.H.D. only), DEFROSTER, SIDE DEMISTER