CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER]

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

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

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

4. By inserting the positive (+) lead of the tester into each climate control unit terminal, 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.

― For terminal 1E, first try replacing the blower fan controller. If there is still any malfunction, replace the climate control unit.

Terminal Voltage Table (Reference)

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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

DC/DC IG1^*1

Ignition relay

Switch the ignition ON (engine off or on)

B+

•  Related wiring harness

•  Ignition relay

Switch the ignition off

1.0 or less

IG1^*2

C/U IG1 15 A fuse

Switch the ignition ON (engine off or on)

B+

•  Related wiring harness

•  C/U IG1 15 A fuse

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)

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 (1N)

1I

—

—

—

—

—

1J

Sensor GND

•  Driver-side air mix actuator

•  Passenger-side air mix actuator

•  Airflow mode actuator

•  Evaporator 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 (1N)

1M

Solar radiation sensor (LH) input

Solar radiation sensor

Sunlight shined directly on the solar radiation sensor

4

•  Related wiring harness

•  Climate control unit: terminal voltage (1N)

•  Solar radiation sensor

Blocking light to solar radiation sensor

1.0 or less

1N

+5V

•  Driver-side air mix actuator

•  Passenger-side air mix actuator

•  Airflow mode actuator

•  Solar radiation sensor

Under any condition

5

•  Related wiring harness

•  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 the solar radiation sensor

4

•  Related wiring harness

•  Climate control unit: terminal voltage (1N)

•  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, good/no good judgment by terminal voltage is not possible.

•  Related wiring harness

1T

—

—

—

—

—

1U

MS_CAN_L

CAN related module

Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.

•  Related wiring harness

1V

—

—

—

—

—

1W

—

—

—

—

—

1X

—

—

—

—

—

2A

Potentiometer input

Airflow mode actuator

VENT

4.3 or more

•  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 or less

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.)

Moving towards COLD

B+

2C

—

—

—

—

—

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.)

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 or more

•  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)

Set temperature at MAX COLD

1.0 or less

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.)

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 or more

•  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)

Set temperature at MAX COLD

1.0 or less

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.)

Moving towards COLD

B+

2I

Motor operation (VENT)

Airflow mode actuator

Moving towards VENT

B+

•  Related wiring harness

•  Airflow mode actuator

Moving towards DEFROSTER

1.0 or less

2J

Motor operation (FRESH)

Air intake actuator

Moving towards RECIRCULATE

1.0 or less

•  Related wiring harness

•  Air intake actuator

Moving towards FRESH

B+

2K

Motor operation (DEFROSTER)

Airflow mode actuator

Moving towards DEFROSTER

B+

•  Related wiring harness

•  Airflow mode actuator

Moving towards VENT

1.0 or less

2L

Motor operation (RECIRCULATE)

Air intake actuator

Moving towards RECIRCULATE

B+

•  Related wiring harness

•  Air intake actuator

Moving towards FRESH

1.0 or less

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	DC/DC IG1^*1	Ignition relay	Switch the ignition ON (engine off or on)	B+	• Related wiring harness • Ignition relay
Switch the ignition off	1.0 or less
IG1^*2	C/U IG1 15 A fuse	Switch the ignition ON (engine off or on)	B+	• Related wiring harness • C/U IG1 15 A fuse
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)
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 (1N)
1I	—	—	—	—	—
1J	Sensor GND	• Driver-side air mix actuator • Passenger-side air mix actuator • Airflow mode actuator • Evaporator 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 (1N)
1M	Solar radiation sensor (LH) input	Solar radiation sensor	Sunlight shined directly on the solar radiation sensor	4	• Related wiring harness • Climate control unit: terminal voltage (1N) • Solar radiation sensor
Blocking light to solar radiation sensor	1.0 or less
1N	+5V	• Driver-side air mix actuator • Passenger-side air mix actuator • Airflow mode actuator • Solar radiation sensor	Under any condition	5	• Related wiring harness • 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 the solar radiation sensor	4	• Related wiring harness • Climate control unit: terminal voltage (1N) • 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, good/no good judgment by terminal voltage is not possible.	• Related wiring harness
1T	—	—	—	—	—
1U	MS_CAN_L	CAN related module	Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.	• Related wiring harness
1V	—	—	—	—	—
1W	—	—	—	—	—
1X	—	—	—	—	—
2A	Potentiometer input	Airflow mode actuator	VENT	4.3 or more	• 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 or less
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.)
Moving towards COLD	B+
2C	—	—	—	—	—
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.)
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 or more	• 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)
Set temperature at MAX COLD	1.0 or less
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.)
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 or more	• 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)
Set temperature at MAX COLD	1.0 or less
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.)
Moving towards COLD	B+
2I	Motor operation (VENT)	Airflow mode actuator	Moving towards VENT	B+	• Related wiring harness • Airflow mode actuator
Moving towards DEFROSTER	1.0 or less
2J	Motor operation (FRESH)	Air intake actuator	Moving towards RECIRCULATE	1.0 or less	• Related wiring harness • Air intake actuator
Moving towards FRESH	B+
2K	Motor operation (DEFROSTER)	Airflow mode actuator	Moving towards DEFROSTER	B+	• Related wiring harness • Airflow mode actuator
Moving towards VENT	1.0 or less
2L	Motor operation (RECIRCULATE)	Air intake actuator	Moving towards RECIRCULATE	B+	• Related wiring harness • Air intake actuator
Moving towards FRESH	1.0 or less

*1 :With i-stop

*2 :Without i-stop

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