CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER]

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Dual Type

1.  Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].)(See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)(See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].)(See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].)

2.  Remove the following parts:

(1)  Glove compartment (See GLOVE COMPARTMENT REMOVAL/INSTALLATION.)
(2)  Decoration panel (See DECORATION PANEL REMOVAL/INSTALLATION.)
(3)  Upper panel (See UPPER PANEL REMOVAL.)(See UPPER PANEL INSTALLATION.)
(4)  Rear console (See REAR CONSOLE REMOVAL/INSTALLATION.)
(5)  Shift lever knob (MTX) (See MANUAL TRANSAXLE SHIFT MECHANISM REMOVAL/INSTALLATION [F35M-R].)(See MANUAL TRANSAXLE SHIFT MECHANISM REMOVAL/INSTALLATION [C66M-R].)(See MANUAL TRANSAXLE SHIFT MECHANISM REMOVAL/INSTALLATION [D66M-R].)(See MANUAL TRANSAXLE SHIFT MECHANISM REMOVAL/INSTALLATION [F66M-R].)
(6)  Selector lever knob (ATX) (See AUTOMATIC TRANSAXLE SHIFT MECHANISM REMOVAL/INSTALLATION.)
(7)  Shift panel (See SHIFT PANEL REMOVAL/INSTALLATION.)
(8)  Front console box (See FRONT CONSOLE BOX REMOVAL/INSTALLATION.)
(9)  CD player (with CD player) (See CD PLAYER REMOVAL.)(See CD PLAYER INSTALLATION.)
(10)  Side wall (See SIDE WALL REMOVAL/INSTALLATION.)
(11)  Front console (See FRONT CONSOLE 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. If there is still any 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)
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
•  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 (1N)
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
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 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, 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 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.)
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


Single Type

1.  Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].)

2.  Remove the following parts:

(1)  Glove compartment (See GLOVE COMPARTMENT REMOVAL/INSTALLATION.)
(2)  Decoration panel (See DECORATION PANEL REMOVAL/INSTALLATION.)
(3)  Upper panel (See UPPER PANEL REMOVAL.)(See UPPER PANEL INSTALLATION.)
(4)  Rear console (See REAR CONSOLE REMOVAL/INSTALLATION.)
(5)  Shift lever knob (MTX) (See MANUAL TRANSAXLE SHIFT MECHANISM REMOVAL/INSTALLATION [F35M-R].) (See MANUAL TRANSAXLE SHIFT MECHANISM REMOVAL/INSTALLATION [C66M-R].)(See MANUAL TRANSAXLE SHIFT MECHANISM REMOVAL/INSTALLATION [F66M-R].)
(6)  Selector lever knob (ATX) (See AUTOMATIC TRANSAXLE SHIFT MECHANISM REMOVAL/INSTALLATION.)
(7)  Shift panel (See SHIFT PANEL REMOVAL/INSTALLATION.)
(8)  Front console box (See FRONT CONSOLE BOX REMOVAL/INSTALLATION.)
(9)  CD player (with CD player) (See CD PLAYER REMOVAL.)(See CD PLAYER INSTALLATION.)
(10)  Side wall (See SIDE WALL REMOVAL/INSTALLATION.)
(11)  Front console (See FRONT CONSOLE 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 Q), replace the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
―  For terminal Q, first try replacing the blower fan controller. If there is still any malfunction, replace the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

am3uuw00010220

Terminal voltage table (reference)

Terminal

Signal name

Connected to

Measurement condition

Voltage (V)

Inspection item (s)
A
—
—
—
—
—
B
MS_CAN_L
CAN related module
Because this terminal is for communication, integrity determination by terminal voltage is not possible.
•  Related wiring harness
C
GND
Body ground
Under any condition
1.0 or less
•  Related wiring harness
D
MS_CAN_H
CAN related module
Because this terminal is for communication, integrity determination by terminal voltage is not possible.
•  Related wiring harness
E
Sensor GND
•  Air mix actuator
•  Airflow mode actuator
•  Passenger compartment temperature sensor
•  Evaporator temperature sensor
Under any condition
1.0 or less
•  Related wiring harness
•  Climate control unit: terminal voltage (H)
F
Passenger compartment temperature sensor input
Passenger compartment temperature sensor
Compared with temperature detected by passenger compartment temperature sensor
Refer to graph 1
•  Related wiring harness
•  Passenger compartment temperature sensor
•  Climate control unit: terminal voltage (H)
G
Potentiometer input
Passenger-side air mix actuator
Set temperature at MAX HOT
4.3 or more
•  Related wiring harness
•  Passenger-side air mix actuator
•  Climate control unit: terminal voltage (H)
Set temperature at MAX COLD
1.0 or less
H
+5V
•  Air mix actuator
•  Airflow mode actuator
•  Solar radiation sensor
Under any condition
5
•  Related wiring harness
•  Air mix actuator
•  Airflow mode actuator
•  Solar radiation sensor
•  Climate control unit: terminal voltage (E)
I
Potentiometer input
Airflow mode actuator
VENT
4.3 or more
•  Related wiring harness
•  Airflow mode actuator
•  Climate control unit: terminal voltage (H)
BI-LEVEL
3.4
HEAT
2.5
HEAT/DEF
1.6
DEFROSTER
0.7 or less
J
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 (H)
K
Solar radiation sensor (RH) input
Solar radiation sensor
Sunlight shined directly on solar radiation sensor
4
•  Related wiring harness
•  Climate control unit: terminal voltage (H)
•  Solar radiation sensor
Blocking light to solar radiation sensor
1.0 or less
L
B+
ROOM 15 A fuse
Under any condition
B+
•  Related wiring harness
•  ROOM 15 A fuse
M
Solar radiation sensor (LH) input
Solar radiation sensor
Sunlight shined directly on solar radiation sensor
4
•  Related wiring harness
•  Climate control unit: terminal voltage (H)
•  Solar radiation sensor
Blocking light to solar radiation sensor
1.0 or less
N
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
O
—
—
—
—
—
P
—
—
—
—
—
Q
Blower fan speed control
Blower fan controller
(See Blower Fan Speed Control Signal)
•  Related wiring harness
•  Blower fan controller
R
—
—
—
—
—
S
Motor operation (RECIRCULATE)
Air intake actuator
Moving towards RECIRCULATE
B+
•  Related wiring harness
•  Air intake actuator
Moving towards FRESH
1.0 or less
T
Motor operation (VENT)
Airflow mode actuator
Moving towards VENT
B+
•  Related wiring harness
•  Airflow mode actuator
Moving towards DEFROSTER
1.0 or less
U
Motor operation (FRESH)
Air intake actuator
Moving towards RECIRCULATE
1.0 or less
•  Related wiring harness
•  Air intake actuator
Moving towards FRESH
B+
V
Motor operation (DEFROSTER)
Airflow mode actuator
Moving towards DEFROSTER
B+
•  Related wiring harness
•  Airflow mode actuator
Moving towards VENT
1.0 or less
W
Motor operation (COLD)
Air mix actuator
Moving towards HOT
1.0 or less
•  Related wiring harness
•  Air mix actuator
Moving towards COLD
B+
X
Motor operation (HOT)
Air mix actuator
Moving towards HOT
B+
•  Related wiring harness
•  Air mix actuator
Moving towards COLD
1.0 or less


Blower Fan Speed Control Signal


Fan stopped

aaxjjw00019786
Climate control unit terminal
•  1E(+)—body ground(-) (dual type climate control unit)
•  Q(+)—body ground(-) (single type climate control unit)
Oscilloscope setting
•  5 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
•   Switch the ignition ON (engine off or on)


Manual 1st

aaxjjw00019787
Climate control unit terminal
•  1E(+)—body ground(-) (dual type climate control unit)
•  Q(+)—body ground(-) (single type climate control unit)
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

aaxjjw00019788
Climate control unit terminal
•  1E(+)—body ground(-) (dual type climate control unit)
•  Q(+)—body ground(-) (single type climate control unit)
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

aaxjjw00019789
Climate control unit terminal
•  1E(+)—body ground(-) (dual type climate control unit)
•  Q(+)—body ground(-) (single type climate control unit)
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