CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER]

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1.  Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE 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 [F65M-R].)(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 (See FRONT CONSOLE BOX REMOVAL/INSTALLATION.)
(14)  CD player (with CD player) (See CD PLAYER REMOVAL.)(See CD PLAYER INSTALLATION.)
(15)  DVD/CD player (with DVD/CD player) (See DVD/CD PLAYER REMOVAL.)(See DVD/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 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].)

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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
•  Cabin temperature sensor
•  Evaporator temperature sensor
Under any condition
1.0 or less
•  Related wiring harness
•  Climate control unit: terminal voltage (H)
F
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 (E)
G
Potentiometer input
Passenger-side air mix actuator
Set temperature at MAX HOT
4.0 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
4.0 or more
•  Related wiring harness
•  Airflow mode actuator
•  Climate control unit: terminal voltage (H)
BI-LEVEL
3.2
HEAT
2.4
HEAT/DEF
1.6
DEFROSTER
0.8 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 (E)
K
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 (H)
•  Solar radiation sensor
Blocking light to solar radiation sensor
1.0 or less
L
B+
INTERIOR 15 A fuse
Under any condition
B+
•  Related wiring harness
•  INTERIOR 15 A fuse
M
—
—
—
—
—
N
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
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

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