Mazda 6. Manual — part 89
CONTROL SYSTEM
U–29
U
Airflow Volume Manual Control
•
The blower motor (airflow) has seven speeds and is operated by the fan switch.
End Of Sie
AIRFLOW MODE CONTROL
A6E854001044T06
•
Airflow mode is controlled by the airflow mode actuator to improve efficiency, heating, and A/C comfort.
.
Fan speed
Switch operation
Control device
Blower motor voltage
1st
Airflow volume automatic control, manual 2nd (–
), manual 1st (–) or OFF (+ or –)
→
manual 1st
Power MOS FET
4.4 (V)
2nd
Airflow volume automatic control, manual 1st
(+), or manual 4th (–)
→
manual 2nd
Power MOS FET
6.1 (V)
3rd
Airflow volume automatic control, manual 2nd
(+), or manual 4th (–)
→
manual 3rd
Power MOS FET
7.8 (V)
4th
Airflow volume automatic control, manual 3rd
(+), or manual 5th (–)
→
manual 4th
Power MOS FET
9.5 (V)
5th
Airflow volume automatic control, manual 4th
(+), or manual 6th (–)
→
manual 5th
Power MOS FET
10.8 (V)
6th
Airflow volume automatic control, manual 5th
(+), or manual 7th (–)
→
manual 6th
Power MOS FET
12.1 (V)
7th
Airflow volume automatic control, manual 6th
(+), or manual 7th (+)
→
manual 7th
Power MOS FET
B+
A6E8540T045
1
MODE switch
2
Evaporator temperature
3
Ambient temperature
4
Sunlight intensity
5
Coolant temperature
6
Cabin temperature
7
Air mix actuator opening degree
8
A/C compressor control condition
9
Signals
10
Climate control unit
11
Output
12
Feedback
13
Airflow modeactuator
14
Operation
15
Airflow mode doors
16
Airflow mode changes
U–30
CONTROL SYSTEM
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 (European (L.H.D. U.K.) specs.)
•
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.
A6E8540T006
1
Airflow mode (A/C on mode)
2
Airflow mode (A/C off mode)
3
VENT
4
BI-LEVEL
5
HEAT
6
Air mix actuator
7
COLD
8
HOT
9
Amount varies
CONTROL SYSTEM
U–31
U
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.
End Of Sie
AIR INTAKE CONTROL
A6E854001044T07
•
Air intake mode is controlled by air intake actuator to adjust and cool down the cabin temperature quickly
adjusting to cooling condition.
.
A6E8540T007
1
Ambient temperature
2
VENT
3
DEFROSTER
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
A6E8540T046
1
REC/FRESH switch
2
A/C compressor control condition
3
Defroster switch
4
Sunlight intensity
5
Ambient temperature
6
Cabin temperature
7
Signals
8
Climate control unit
9
Output
10
Air intake actuator
11
Operation
12
Air intake door
13
Air intake mode changes
U–32
CONTROL SYSTEM
Air Intake Automatic Control
•
Based on the ambient temperature and sunlight intensity, the climate control unit calculates the cabin
temperature computation value. By comparison with this cabin temperature computation value and actual
cabin temperature, air intake mode is determined.
.
Correction
MAX COLD correction
•
When the temperature is set to 15.0 (European (L.H.D. U.K.) specs.) or 18.0 (GCC specs.), air intake is fixed in
recirculated air intake mode to improve cooling effect. This correction does not operate when defroster
correction is on or when the A/C compressor is in OFF mode or when the ambient temperature is below 5
°
C
{41
°
F}.
Defroster correction
•
When the defroster switch is on, air intake is fixed in fresh air intake mode to improve defrosting effect, and this
correction also operates when recirculated air intake mode is on by manual operation.
Ambient temperature correction
•
When the ambient temperature is 5
°
C {41
°
F} or below, air intake mode is fixed at FRESH to prevent
windshield and front door glass fogging.
A/C OFF correction
•
While in air intake automatic control and A/C OFF mode, air intake mode is fixed at FRESH.
Air Intake Manual Control
•
The driver can switch air intake mode by operating the REC/FRESH switch.
End Of Sie
A/C COMPRESSOR CONTROL
A6E854001044T08
•
In A/C compressor control, the A/C relay (A/C compressor) is controlled via the PCM so that discharged air is
simultaneously cooled and dehumidified to provide comfortable air conditioning.
•
The climate control unit sends A/C signals to the PCM which actuates the A/C relay.
.
A6E8540T008
1
Cabin temperature computation value
2
Recirculate
3
Fresh
4
Cabin temperature
5
Low
6
High
Air intake mode
REC/FRESH switch operation
FRESH
Switching from RECIRCULATE to FRESH fixes mode in FRESH
RECIRCULATE
Switching from FRESH to RECIRCULATE fixes mode in RECIRCULATE
A6E8540T051
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