CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER]

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1. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].)(See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].)

2. Remove the following parts:

(1) Upper panel (See UPPER PANEL REMOVAL/INSTALLATION.)

(2) Rear console (See REAR CONSOLE REMOVAL/INSTALLATION.)

(3) Console side panel (See CONSOLE SIDE PANEL REMOVAL/INSTALLATION.)

(4) Shift lever knob (MTX) (See MANUAL TRANSAXLE SHIFT MECHANISM REMOVAL/INSTALLATION [C66M-R].)(See MANUAL TRANSAXLE SHIFT MECHANISM REMOVAL/INSTALLATION [D66M-R, D66MX-R].)

(5) Selector lever knob (ATX) (See AUTOMATIC TRANSAXLE SHIFT MECHANISM REMOVAL/INSTALLATION.)

(6) Shift panel (See SHIFT PANEL REMOVAL/INSTALLATION.)

(7) Front console box (See FRONT CONSOLE BOX REMOVAL/INSTALLATION.)

(8) CD player (with CD player) (See CD PLAYER REMOVAL.)(See CD PLAYER INSTALLATION.)

(9) DVD/CD player (with DVD/CD player) (See DVD/CD PLAYER REMOVAL.)(See DVD/CD PLAYER INSTALLATION.)

(10) Side wall (See SIDE WALL REMOVAL/INSTALLATION.)

(11) Front console (See FRONT CONSOLE REMOVAL/INSTALLATION.)

(12) Upper column cover (See COLUMN COVER REMOVAL/INSTALLATION.)

(13) Meter hood (See METER HOOD REMOVAL/INSTALLATION.)

(14) Glove compartment (See GLOVE COMPARTMENT REMOVAL/INSTALLATION.)

(15) Passenger-side decoration panel (See DECORATION PANEL REMOVAL/INSTALLATION.)

3. Remove the climate control unit with the connector connected. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

4. Connect the negative battery cable.

5. Switch the ignition ON (engine off or on).

6. Connect the negative (-) lead of the tester to body ground.

7. Insert the positive (+) lead of the tester into each climate control unit terminal and measure the voltage according to the terminal voltage table.

• If there is any malfunction, inspect the parts under “Inspection item (s)”.

― If the parts under “Inspection item (s)” are found to be normal (except for terminal 1E), replace the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

― For terminal 1E, first try replacing the blower fan controller. (See BLOWER FAN CONTROLLER REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

If there is still malfunction, replace the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

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Terminal voltage table (reference)

Terminal	Signal name	Connected to	Measurement condition	Voltage (V)	Inspection item (s)
1A	GND	Body ground	Under any condition	1.0 or less	• Related wiring harness
1B	B+	ROOM 15 A fuse	Under any condition	B+	• Related wiring harness • ROOM 15 A fuse
1C	—	—	—	—	—
1D	IG1	Ignition relay (with i-stop) C/U IG1 15 A fuse (without i-stop)	Switch the ignition ON (engine off or on)	B+	• Related wiring harness • Ignition relay • C/U IG1 15 A fuse (without i-stop)
1D	IG1		Switch the ignition off	1.0 or less
1E	Blower fan speed control	Blower fan controller	(See Blower Fan Speed Control Signal)		• Related wiring harness • Blower fan controller
1F	IG2	Front body control module (FBCM)	Switch the ignition ON (engine off or on)	B+	• Related wiring harness • Front body control module (FBCM)
1F	IG2	Front body control module (FBCM)	Switch the ignition off	1.0 or less
1G	—	—	—	—	—
1H	Cabin temperature sensor input	Cabin temperature sensor	Compared with temperature detected by cabin temperature sensor	Refer to graph 1	• Related wiring harness • Cabin temperature sensor • Climate control unit: terminal voltage (1J)
1I	—	—	—	—	—
1J	Sensor GND	• Air intake actuator^*1 • Driver-side air mix actuator • Passenger-side air mix actuator • Airflow mode actuator • Evaporator temperature sensor • Cabin temperature sensor	Under any condition	1.0 or less	• Related wiring harness • Climate control unit: terminal voltage (1N)
1K	—	—	—	—	—
1L	Evaporator temperature sensor input	Evaporator temperature sensor	Compared with temperature detected by evaporator temperature sensor	Refer to graph 2	• Related wiring harness • Evaporator temperature sensor • Climate control unit: terminal voltage (1J)
1M	Solar radiation sensor (LH) input	Solar radiation sensor	Sunlight shined directly on solar radiation sensor	4	• Related wiring harness • Climate control unit: terminal voltage (1N) • Solar radiation sensor
1M	Solar radiation sensor (LH) input	Solar radiation sensor	Blocking light to solar radiation sensor	1.0 or less
1N	+5V	• Air intake actuator^*1 • Driver-side air mix actuator • Passenger-side air mix actuator • Airflow mode actuator • Solar radiation sensor	Under any condition	5.0	• Related wiring harness • Air intake actuator^*1 • Driver-side air mix actuator • Passenger-side air mix actuator • Airflow mode actuator • Solar radiation sensor • Climate control unit: terminal voltage (1J)
1O	Solar radiation sensor (RH) input	Solar radiation sensor	Sunlight shined directly on solar radiation sensor	4	• Related wiring harness • Climate control unit: terminal voltage (1N) • Solar radiation sensor
1O	Solar radiation sensor (RH) input	Solar radiation sensor	Blocking light to solar radiation sensor	1.0 or less
1P	—	—	—	—	—
1Q	—	—	—	—	—
1R	—	—	—	—	—
1S	MS_CAN_H	CAN related module	Because this terminal is for communication, integrity determination by terminal voltage is not possible.		• Related wiring harness
1T	—	—	—	—	—
1U	MS_CAN_L	CAN related module	Because this terminal is for communication, integrity determination by terminal voltage is not possible.		• Related wiring harness
1V	—	—	—	—	—
1W	—	—	—	—	—
1X	—	—	—	—	—
2A	Potentiometer input	Airflow mode actuator	VENT	4.3	• Related wiring harness • Airflow mode actuator • Climate control unit: terminal voltage (1N)
			BI-LEVEL	3.4
			HEAT	2.5
			HEAT/DEF	1.6
			DEFROSTER	0.7
2B	Motor operation (COLD)	• Driver-side air mix actuator (L.H.D.) • Passenger-side air mix actuator (R.H.D.)	Moving towards HOT	1.0 or less	• Related wiring harness • Driver-side air mix actuator (L.H.D.) • Passenger-side air mix actuator (R.H.D.)
2B	Motor operation (COLD)		Moving towards COLD	B+
2C^*1	Potentiometer input	Air intake actuator	RECIRCULATE	1.0	• Related wiring harness • Air intake actuator • Climate control unit: terminal voltage (1N)
2C^*1	Potentiometer input	Air intake actuator	FRESH	4.0
2D	Motor operation (HOT)	• Driver-side air mix actuator (L.H.D.) • Passenger-side air mix actuator (R.H.D.)	Moving towards HOT	B+	• Related wiring harness • Driver-side air mix actuator (L.H.D.) • Passenger-side air mix actuator (R.H.D.)
2D	Motor operation (HOT)		Moving towards COLD	1.0 or less
2E	Potentiometer input	• Passenger-side air mix actuator (L.H.D.) • Driver-side air mix actuator (R.H.D.)	Set temperature at MAX HOT	4.3	• Related wiring harness • Passenger-side air mix actuator (L.H.D.) • Driver-side air mix actuator (R.H.D.) • Climate control unit: terminal voltage (1N)
2E	Potentiometer input		Set temperature at MAX COLD	0.7
2F	Motor operation (HOT)	• Passenger-side air mix actuator (L.H.D.) • Driver-side air mix actuator (R.H.D.)	Moving towards HOT	B+	• Related wiring harness • Passenger-side air mix actuator (L.H.D.) • Driver-side air mix actuator (R.H.D.)
2F	Motor operation (HOT)		Moving towards COLD	1.0 or less
2G	Potentiometer input	• Driver-side air mix actuator (L.H.D.) • Passenger-side air mix actuator (R.H.D.)	Set temperature at MAX HOT	4.3	• Related wiring harness • Driver-side air mix actuator (L.H.D.) • Passenger-side air mix actuator (R.H.D.) • Climate control unit: terminal voltage (1N)
2G	Potentiometer input		Set temperature at MAX COLD	0.7
2H	Motor operation (COLD)	• Passenger-side air mix actuator (L.H.D.) • Driver-side air mix actuator (R.H.D.)	Moving towards HOT	1.0 or less	• Related wiring harness • Passenger-side air mix actuator (L.H.D.) • Driver-side air mix actuator (R.H.D.)
2H	Motor operation (COLD)		Moving towards COLD	B+
2I	Motor operation (VENT)	Airflow mode actuator	Moving towards VENT	B+	• Related wiring harness • Airflow mode actuator
2I	Motor operation (VENT)	Airflow mode actuator	Moving towards DEFROSTER	1.0 or less	• Related wiring harness • Airflow mode actuator
2J	Motor operation (FRESH)	Air intake actuator	Moving towards RECIRCULATE	1.0 or less	• Related wiring harness • Air intake actuator
2J	Motor operation (FRESH)	Air intake actuator	Moving towards FRESH	B+	• Related wiring harness • Air intake actuator
2K	Motor operation (DEFROSTER)	Airflow mode actuator	Moving towards DEFROSTER	B+	• Related wiring harness • Airflow mode actuator
2K	Motor operation (DEFROSTER)	Airflow mode actuator	Moving towards VENT	1.0 or less	• Related wiring harness • Airflow mode actuator
2L	Motor operation (RECIRCULATE)	Air intake actuator	Moving towards RECIRCULATE	B+	• Related wiring harness • Air intake actuator
2L	Motor operation (RECIRCULATE)	Air intake actuator	Moving towards FRESH	1.0 or less	• Related wiring harness • Air intake actuator

*1 :With potentiometer type air intake actuator

Blower Fan Speed Control Signal

Fan stopped

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Climate control unit terminal

• 1E(+)—body ground(-)

Oscilloscope setting

• 5 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition

• Switch the ignition ON (engine off or on)

Manual 1st

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Climate control unit terminal

• 1E(+)—body ground(-)

Oscilloscope setting

• 5 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition

• Switch the ignition ON (engine off or on)

• Airflow mode: VENT

• Air intake mode: RECIRCULATE

Manual 3rd

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Climate control unit terminal

• 1E(+)—body ground(-)

Oscilloscope setting

• 5 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition

• Switch the ignition ON (engine off or on)

• Airflow mode: VENT

• Air intake mode: RECIRCULATE

Manual 7th

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Climate control unit terminal

• 1E(+)—body ground(-)

Oscilloscope setting

• 5 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition

• Switch the ignition ON (engine off or on)

• Airflow mode: VENT

• Air intake mode: RECIRCULATE