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1.Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.)

2.Remove the following parts:

(1)Driver-side front scuff plate (See FRONT SCUFF PLATE REMOVAL/INSTALLATION.)
(2)Driver-side front side trim (See FRONT SIDE TRIM REMOVAL/INSTALLATION.)
(3)Bonnet release lever (See BONNET RELEASE LEVER AND RELEASE CABLE REMOVAL/INSTALLATION.)
(4)Fuel-filler lid opener lever (See FUEL-FILLER LID OPENER AND LEVER REMOVAL/INSTALLATION.)
(5)Driver-side lower panel (See DRIVER-SIDE LOWER PANEL REMOVAL/INSTALLATION.)
(6)Center console tray (See CENTER CONSOLE TRAY REMOVAL/INSTALLATION.)
(7)Shift bezel (See SHIFT BEZEL REMOVAL/INSTALLATION.)
(8)Upper panel (See UPPER PANEL REMOVAL/INSTALLATION.)
(9)Shift lever knob (MTX) (See MANUAL TRANSAXLE SHIFT MECHANISM REMOVAL/INSTALLATION [F66M-R].)
(10)Selector lever knob (ATX) (See AUTOMATIC TRANSAXLE SHIFT MECHANISM REMOVAL/INSTALLATION.)
(11)Shift panel (See SHIFT PANEL REMOVAL/INSTALLATION.)
(12)Console side panel (See CONSOLE SIDE PANEL REMOVAL/INSTALLATION.)
(13)Front console box (without wireless charger (Qi)) (See FRONT CONSOLE BOX REMOVAL/INSTALLATION.)
(14)Wireless charger (Qi) (with wireless charger (Qi)) (See WIRELESS CHARGER (Qi) REMOVAL/INSTALLATION.)
(15)CD player (with CD player) (See CD PLAYER REMOVAL.)(See CD PLAYER INSTALLATION.)
(16)Front console (See FRONT CONSOLE REMOVAL/INSTALLATION.)
(17)Side wall (See SIDE WALL REMOVAL/INSTALLATION.)
(18)Rear console (See REAR CONSOLE REMOVAL/INSTALLATION.)
(19)Glove compartment (See GLOVE COMPARTMENT REMOVAL/INSTALLATION.)
(20)Center panel (See CENTER PANEL REMOVAL/INSTALLATION.)
(21)Center lower panel (See CENTER LOWER 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 terminal.

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 G), replace the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
― For terminal G, 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)

A
MS_CAN_L
CAN related module
Because this terminal is for communication, integrity determination by terminal voltage is not possible.
• Related wiring harness
B
MS_CAN_H
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
Sensor GND
• Air intake actuator
• Air mix actuator
• Airflow mode actuator
• Cabin temperature sensor
• Evaporator temperature sensor
Under any condition
1.0 or less
• Related wiring harness
• Climate control unit: terminal voltage (P)
E
F
Potentiometer input
Air mix actuator
Set temperature at MAX HOT
3.9
• Related wiring harness
• Air mix actuator
• Climate control unit: terminal voltage (P)
Set temperature at MAX COLD
1.0
G
Blower fan speed control
Blower fan controller
• Related wiring harness
• Blower fan controller
H
Potentiometer input
Airflow mode actuator
VENT
4.0
• Related wiring harness
• Airflow mode actuator
• Climate control unit: terminal voltage (P)
BI-LEVEL
3.3
HEAT
2.5
HEAT/DEF
1.7
DEFROSTER
0.9
I
J
Solar radiation sensor input
Solar radiation sensor
Sunlight shined directly on solar radiation sensor
Voltage value is output
• Related wiring harness
• Climate control unit: terminal voltage (P)
• Solar radiation sensor
Blocking light to solar radiation sensor
1.0 or less
K
L
M
Motor operation (RECIRCULATE)
Air intake actuator
• Moving towards RECIRCULATE *1
• Moving towards FRESH *2
B+
• Related wiring harness
• Air intake actuator
• Moving towards FRESH *1
• Moving towards RECIRCULATE *2
1.0 or less
N
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 (D)
O
Motor operation (FRESH)
Air intake actuator
• Moving towards RECIRCULATE *1
• Moving towards FRESH *2
1.0 or less
• Related wiring harness
• Air intake actuator
• Moving towards FRESH *1
• Moving towards RECIRCULATE *2
B+
P
+5V
• Air intake actuator
• Air mix actuator
• Airflow mode actuator
• Solar radiation sensor
Under any condition
5
• Related wiring harness
• Air intake actuator
• Air mix actuator
• Airflow mode actuator
• Solar radiation sensor
• Climate control unit: terminal voltage (D)
Q
Motor operation (VENT)
Airflow mode actuator
Moving towards VENT
B+
• Related wiring harness
• Airflow mode actuator
Moving towards DEFROSTER
1.0 or less
R
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 (D)
S
Motor operation (DEFROSTER)
Airflow mode actuator
Moving towards DEFROSTER
B+
• Related wiring harness
• Airflow mode actuator
Moving towards VENT
1.0 or less
T *1
Potentiometer input
Air intake actuator
RECIRCULATE
1.7
• Related wiring harness
• air intake actuator
• Climate control unit: terminal voltage (P)
FRESH
3.2
U
Motor operation (COLD)
Air mix actuator
Moving towards HOT
1.0 or less
• Related wiring harness
• Air mix actuator
Moving towards COLD
B+
V
B+
INTERIOR 15 A fuse
Under any condition
B+
• Related wiring harness
• INTERIOR 15 A fuse
W
Motor operation (HOT)
Air mix actuator
Moving towards HOT
B+
• Related wiring harness
• Air mix actuator
Moving towards COLD
1.0 or less
X
IG1
C/U IG1 15 A fuse
Switch the ignition ON (engine off or on)
B+
• Related wiring harness
• C/U IG1 15 A fuse

*1:With potentiometer type air intake actuator
*2:With mechanical lock type air intake actuator


Blower Fan Speed Control Signal


Fan stopped

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Climate control unit terminal
• G(+)—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
• G(+)—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
• G(+)—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
• G(+)—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