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2016 – MX-5 – HVAC

A/C OPERATION CHECK MODE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)]

• The A/C operation check mode forcibly operates the output devices as shown in the operation check table regardless of the signals input to the climate control unit.

• During an A/C operation check mode operation, indication in the display panel and the illumination of the indicator light on the switches are automatically controlled.

• Determine the malfunctioning part by visual inspection, listening to the operation sound, placing a hand on the air vents, or checking that each transition is as indicated in the operation check table.

M-MDS display	Target part	Reference
Air Mix Actuator	Air mix actuator Air mix door	(See Air mix actuator)
Air conditioning compressor	A/C compressor	(See A/C compressor)
Air Intake Actuator	Air intake actuator Air intake door	(See Air intake actuator)
Blower Motor Speed	Blower motor	(See Blower motor)
Air Flow Mode Actuator	Airflow mode actuator Airflow mode door	(See Airflow mode actuator)
Illumination of All Indicator Lights	Climate control unit	(See Indicator light)

Air mix actuator

1. Connect the M-MDS to the DLC-2.

2. Switch the ignition ON (engine off).

3. After the vehicle is identified, select the following items from the initial screen of the M-MDS.

a. Select the “Body”.

b. Select the “EATC Operation Check”.

4. Select the “Air Mix Actuator” from the screen menu.

5. Verify the A/C operation check mode according to the directions on the screen.

6. Select “Stop” to stop the A/C operation check. (See A/C operation check stop.)
Operation

Step	Air mix actuator	Airflow mode actuator	Blower speed	Magnet clutch	Air intake actuator	Rear window defogger
1	0 %	VENT	5th	ON	FRESH	OFF
2	100 %

Indicator light

Step	Recirculate switch indicator light	Rear window defogger switch indicator light	A/C switch indicator light
1	Not Illuminated	Not illuminated	Illuminated
2

NOTE:

• After approx. 22 s have elapsed, the operation step moves to the next step.

• When the last step is finished, the operation is repeated from Step 1.

• To prevent super-cooling, the magnetic clutch turns off despite the A/C forced override.

A/C compressor

1. Connect the M-MDS to the DLC-2.

2. Switch the ignition ON (engine off).

3. After the vehicle is identified, select the following items from the initial screen of the M-MDS.

a. Select the “Body”.

b. Select the “EATC Operation Check”.

4. Select the “Air conditioning compressor” from the screen menu.

5. Verify the A/C operation check mode according to the directions on the screen.

6. Select “Stop” to stop the A/C operation check. (See A/C operation check stop.)
Operation

Step	Air mix actuator	Airflow mode actuator	Blower speed	Magnet clutch	Air intake actuator	Rear window defogger
1	0 %	VENT	5th	ON	FRESH	OFF
2				OFF

Indicator light

Step	Recirculate switch indicator light	Rear window defogger switch indicator light	A/C switch indicator light
1	Not illuminated	Not illuminated	Illuminated
2			Not illuminated

NOTE:

• After the following times have elapsed, the operation step moves to the next step.

• Step 1: Approx. 5 s

• Step 2: Approx. 25 s

• When the last step is finished, the operation is repeated from Step 1.

Air intake actuator

1. Connect the M-MDS to the DLC-2.

2. Switch the ignition ON (engine off).

3. After the vehicle is identified, select the following items from the initial screen of the M-MDS.

a. Select the “Body”.

b. Select the “EATC Operation Check”.

4. Select the “Air Intake Actuator” from the screen menu.

5. Verify the A/C operation check mode according to the directions on the screen.

6. Select “Stop” to stop the A/C operation check. (See A/C operation check stop.)
Operation

Step	Air mix actuator	Airflow mode actuator	Blower speed	Magnet clutch	Air intake actuator	Rear window defogger
1	0 %	VENT	5th	ON	FRESH	OFF
2					RECIRCULATE
3				OFF	FRESH
4					RECIRCULATE

Indicator light

Step	Recirculate switch indicator light	Rear window defogger switch indicator light	A/C switch indicator light
1	Not illuminated	Not illuminated	Illuminated
2	Illuminated
3	Not illuminated		Not illuminated
4	Illuminated

NOTE:

• After approx. 11 s have elapsed, the operation step moves to the next step.

• When the last step is finished, the operation is repeated from Step 1.

• To prevent super-cooling, the magnetic clutch turns off despite the A/C forced override.

Blower motor

1. Connect the M-MDS to the DLC-2.

2. Switch the ignition ON (engine off).

3. After the vehicle is identified, select the following items from the initial screen of the M-MDS.

a. Select the “Body”.

b. Select the “EATC Operation Check”.

4. Select the “Blower Motor Speed” from the screen menu.

5. Verify the A/C operation check mode according to the directions on the screen.

6. Select “Stop” to stop the A/C operation check. (See A/C operation check stop.)
Operation

Step	Air mix actuator	Airflow mode actuator	Blower speed	Magnet clutch	Air intake actuator	Rear window defogger
1	50 %	VENT	OFF	OFF	FRESH	OFF
2			1st	ON
3			3rd
4			5th
5			7th

Indicator light

Step	Recirculate switch indicator light	Rear window defogger switch indicator light	A/C switch indicator light
1	Not illuminated	Not illuminated	Not illuminated
2			Illuminated
3
4
5

NOTE:

• After approx. 4 s have elapsed, the operation step moves to the next step.

• When the last step is finished, the operation is repeated from Step 1.

• To prevent super-cooling, the magnetic clutch turns off despite the A/C forced override.

Airflow mode actuator

1. Connect the M-MDS to the DLC-2.

2. Switch the ignition ON (engine off).

3. After the vehicle is identified, select the following items from the initial screen of the M-MDS.

a. Select the “Body”.

b. Select the “EATC Operation Check”.

4. Select the “Airflow Mode Actuator” from the screen menu.

5. Verify the A/C operation check mode according to the directions on the screen.

6. Select “Stop” to stop the A/C operation check. (See A/C operation check stop.)
Operation

Step	Air mix actuator	Airflow mode actuator	Blower speed	Magnet clutch	Air intake actuator	Rear window defogger
1	50 %	VENT	5th	ON	FRESH	OFF
2		BI-LEVEL
3		HEAT
4		DEF/HEAT
5		DEFROSTER

Indicator light

Step	Recirculate switch indicator light	Rear window defogger switch indicator light	A/C switch indicator light
1	Not illuminated	Not illuminated	Illuminated
2
3
4
5

NOTE:

• After approx. 11 s have elapsed, the operation step moves to the next step.

• When the last step is finished, the operation is repeated from Step 1.

• To prevent super-cooling, the magnetic clutch turns off despite the A/C forced override.

Indicator light

1. Connect the M-MDS to the DLC-2.

2. Switch the ignition ON (engine off).

3. After the vehicle is identified, select the following items from the initial screen of the M-MDS.

a. Select the “Body”.

b. Select the “EATC Operation Check”.

4. Select the “Illumination Of All Indicator Lights” from the screen menu.

5. Verify the A/C operation check mode according to the directions on the screen.

6. Select “Stop” to stop the A/C operation check. (See A/C operation check stop.)
Operation

Step	Air mix actuator	Airflow mode actuator	Blower speed	Magnet clutch	Air intake actuator	Rear window defogger
—	50 %	VENT	OFF	OFF	FRESH	OFF

Indicator light

Step	Recirculate switch indicator light	Rear window defogger switch indicator light	A/C switch indicator light
—	Illuminated	Illuminated	Illuminated

A/C operation check stop

1. If “Stop” is selected while the A/C operation check is operating, the A/C stops at the conditions shown in the table.
Operation

Step	Air mix actuator	Airflow mode actuator	Blower speed	Magnet clutch	Air intake actuator	Rear window defogger
—	50 %	VENT	OFF	OFF	FRESH	OFF

Indicator light

Step	Recirculate switch indicator light	Rear window defogger switch indicator light	A/C switch indicator light
—	Not illuminated	Not illuminated	Not illuminated

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