Mazda CX-5 Service & Repair Manual: Full Auto Air Conditioner [Full Auto Air Conditioner]

Mazda CX-5 Service & Repair Manual / HVAC / A/C / Full Auto Air Conditioner [Full Auto Air Conditioner]

Outline

The climate control unit performs the following controls based on the signals from each switch/dial and the sensor.

Airflow temperature control
Airflow volume control
Airflow mode control
Air intake control
A/C compressor control

A/C cut-off control

Controls the A/C operation by switching the A/C relay on/off at the optimal timing according to engine operation conditions..

Block Diagram

Control Table

The full-auto air conditioner system functions based on the five basic types of controls and three supplementary functions.


Basic control	Control description	Correction control
Airflow temperature control	Airflow temperature automatic control	MAX HOT and MAX COLD correction Engine coolant temperature correction
Airflow volume control	Airflow volume automatic control	Engine coolant temperature correction (warm-up correction) Mild start correction MAX HOT and MAX COLD correction Defroster correction Start-up window fogging prevention correction Starting compensation correction Start-up burnt-out prevention function
Airflow volume control	Airflow volume manual control	Defroster correction Starting burnt-out prevention function
Airflow mode control	Airflow mode automatic control	Engine coolant temperature correction (warm-up correction)
Airflow mode control	Airflow mode manual control	—
Air intake control	Air intake automatic control	Defroster correction Ambient temperature correction
Air intake control	Air intake manual control	Defroster correction
A/C compressor control	A/C compressor automatic control	Defroster correction
A/C compressor control	A/C compressor manual control	Defroster correction


Supplementary function
Fail-safe function
Sensor signal delay function
On-board diagnostic function

Control Type Transition by Switch Operation

Airflow temperature control, airflow volume control


Operation switch		Airflow temperature control	Airflow volume control
		Control prior to switch operation	Control prior to switch operation
		Automatic control	Automatic control	Defroster correction	Manual control
		Automatic control	Automatic control	Defroster correction	OFF	1	2	3	4	5	6	7
OFF switch		Automatic control	OFF	OFF	OFF
AUTO switch		Automatic control	Automatic control	Automatic control	Automatic control
Airflow volume control dial	HI	Automatic control	Manual control*2	Manual control*2	1	2	3	4	5	6	7	7
Airflow volume control dial	LO	Automatic control	Manual control*3	Manual control*3	1	1	1	2	3	4	5	6
MODE switch		Automatic control	Automatic control	Automatic control*4	No change
DEFROSTER switch		Automatic control	Defroster correction	Automatic control*4	Defroster correction
A/C switch		Automatic control	Automatic control	No change	*5	No change
RECIRCULATE switch		Automatic control	Automatic control	No change	No change
FRESH switch		Automatic control	Automatic control	No change	No change
Driver-side temperature setting dial*1	15.0/60	MAX COLD	MAX HI	MAX HI	No change
	15.5—31.5/61—89	Automatic control	Automatic control	No change	No change
	32.0/90	MAX HOT	AUTO HI	AUTO HI	No change
Passenger-side temperature setting dial*1	15.0/60	MAX COLD	MAX HI	MAX HI	No change
	15.5—31.5/61—89	Automatic control	Automatic control	No change	No change
	32.0/90	MAX HOT	AUTO HI	AUTO HI	No change
Dual switch		Automatic control	No change	No change	No change

*1 Adjusted up or down in increments of 0.5 with a range of 15.0—32.0 or 1 with a range of 60—90.

*2 Increases to the manual voltage that is closest to the auto or defroster correction voltage.

*3 Decreases to the manual voltage that is closest to the auto or defroster correction voltage.

*4 Returns to condition prior to defroster operation. However, if it had been off prior to defroster operation, it switches to automatic control.

*5 Returns to fan condition before fan off. However, if it had been defroster correction (manual control) returns to condition as follows.

The condition before fan off defroster correction, the fan condition return to the condition before defroster correction.
The condition before fan off defroster correction and furthermore the condition before defroster correction is fan off, the fan condition change to the automatic control. (It has higher priority than 1)
The condition before fan off defroster correction and fan is manually operated during that defroster correction, the fan condition return to the manually operated condition. (It has higher priority than 1 and 2)

Airflow mode control, air intake control, A/C compressor control


Operation switch		Airflow mode control		Air intake control		A/C compressor control
		Control prior to switch operation		Control prior to switch operation		Control prior to switch operation
		Automatic control	Manual control	Automatic control	Manual control	Automatic control	Manual control
OFF switch		Fixed at mode before turned OFF	No change	Fixed at mode before turned OFF	No change	OFF	OFF
AUTO switch		Automatic control	Automatic control	Automatic control	Automatic control	Automatic control	Automatic control
Airflow volume control dial	HI	Automatic control	No change	Automatic control	No change	Automatic control	No change
Airflow volume control dial	LO	Automatic control	No change	Automatic control	No change	Automatic control	No change
MODE switch		VENT > BI-LEVEL BI-LEVEL > HEAT HEAT > DEF/HEAT DEF/HEAT > VENT	VENT > BI-LEVEL BI-LEVEL > HEAT HEAT > DEF/HEAT DEF/HEAT > VENT	Automatic control	No change	Automatic control	No change
MODE switch		VENT > DEF/HEAT DEF/HEAT > HEAT HEAT > BI-LEVEL BI-LEVEL > VENT DEFROSTER (warm-up) > HEAT	VENT > DEF/HEAT DEF/HEAT > HEAT HEAT > BI-LEVEL BI-LEVEL > VENT DEFROSTER (warm-up) > HEAT	Automatic control	No change	Automatic control	No change
DEFROSTER switch		DEFROSTER	DEFROSTER	Defroster correction	Defroster correction	Defroster correction	Defroster correction
A/C switch		Automatic control	No change	Automatic control	No change	A/C>OFF OFF>A/C	A/C>OFF OFF>A/C
RECIRCULATE switch		Automatic control	No change	FRESH>REC	FRESH>REC	Automatic control	No change
FRESH switch		Automatic control	No change	REC>FRESH	REC>FRESH	Automatic control	No change
Driver-side temperature setting dial*1	15.0/60	Automatic control	No change	Automatic control	No change	Automatic control	No change
	15.5—31.5/61—89	Automatic control	No change	Automatic control	No change	Automatic control	No change
	32.0/90	Automatic control	No change	Automatic control	No change	Automatic control	No change
Passenger-side temperature setting dial*1	15.0/60	Automatic control	No change	Automatic control	No change	Automatic control	No change
	15.5—31.5/61—89	Automatic control	No change	Automatic control	No change	Automatic control	No change
	32.0/90	Automatic control	No change	Automatic control	No change	Automatic control	No change
Dual switch		Automatic control	No change	Automatic control	No change	No change	No change

*1 Adjusted up or down in increments of 0.5 with a range of 15.0—32.0 or 1 with a range of 60—90.

Sensor Signal Delay Function

The amount of solar radiation, and the ambient and cabin temperatures may change due to factors such as direct and intermittent sunlight (traveling through a city or a highway tunnel), or radiant heat from the ground under parked vehicles as well as the opening and closing of doors.
If control was performed based exactly on these variations, the air conditioning function would be negatively affected and smooth control could not occur.
In order to prevent this, the climate control unit delays and smoothes the input signals for solar radiation, and the ambient and cabin temperature as shown in the following figure, realizing stable control.
When the engine is restarted after being temporarily stopped, the ambient temperature sensor may detect a temperature higher than the actual ambient temperature.
To prevent this, if the engine coolant temperature exceeds 55 °C {131 °F}
, control of each system is performed based on the ambient temperature data before the engine was stopped, which is stored in the climate control unit.

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