CLIMATE CONTROL UNIT INSPECTION [MANUAL 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 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].)
(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 [MANUAL AIR CONDITIONER].)

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

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

6.  By inserting the positive (+) lead of the tester into the climate control unit connector, 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 I), replace the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)
―  For terminal I, first try replacing the blower fan controller. If there is still any malfunction, replace the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)

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Terminal Voltage Table (7-Speed Type Airflow Volume Control Dial) (Reference)

Terminal

Signal name

Connected to

Measurement condition

Voltage (V)

Inspection item(s)
A
TNS signal
Front body control module (FBCM)
TNS OFF
1.0 or less
•  Related wiring harness
•  Front body control module (FBCM)
TNS ON
B+
B
Illumination (-)
Instrument cluster
Headlight ON and panel light control MAX
2.0
•  Instrument cluster
•  Related wiring harness
Headlight ON and panel light control MIN
9.65
C
Motor operation (RECIRCULATE)
Air intake actuator
Switched to RECIRCULATE
B+
•  Related wiring harness
•  Air intake actuator
Switched to FRESH
1.0 or less
D
Ground
Body ground
Under any condition
1.0 or less
•  Related wiring harness
E
Motor operation (FRESH)
Air intake actuator
Switched to RECIRCULATE
1.0 or less
•  Related wiring harness
•  Air intake actuator
Switched to FRESH
B+
F
Sensor GND
Evaporator temperature sensor
Under any condition
1.0 or less
•  Related wiring harness
•  Climate control unit: terminal voltage (H)
G
—
—
—
—
—
H*1
Evaporator temperature sensor input
Evaporator temperature sensor
Compared with temperature detected by evaporator temperature sensor
Refer to graph 1
•  Related wiring harness
•  Evaporator temperature sensor
•  Climate control unit: terminal voltage (F)
I
Blower fan speed control
Blower fan controller
(See Blower Fan Speed Control Signal)
•  Related wiring harness
•  Blower fan controller
J
B+
ROOM 15 A fuse
Under any condition
B+
•  Related wiring harness
•  ROOM 15 A fuse
K
LIN
Front body control module (FBCM)
Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
•  Related wiring harness
•  Front body control module (FBCM)
L
IG2
Front body control module (FBCM)
Switch the ignition to ON
B+
•  Related wiring harness
•  Front body control module (FBCM)
Switch the ignition off
1.0 or less

*1  :With cooling system


Terminal Voltage Table (4-Speed Type Airflow Volume Control Dial) (Reference)

Terminal

Signal name

Connected to

Measurement condition

Voltage (V)

Inspection item(s)
A
TNS signal
Front body control module (FBCM)
TNS OFF
1.0 or less
•  Related wiring harness
•  Front body control module (FBCM)
TNS ON
B+
B
Illumination (-)
Instrument cluster
Headlight ON and panel light control MAX
2.0
•  Instrument cluster
•  Related wiring harness
Headlight ON and panel light control MIN
9.65
C
Motor operation (RECIRCULATE)
Air intake actuator
Switched to RECIRCULATE
B+
•  Related wiring harness
•  Air intake actuator
Switched to FRESH
1.0 or less
D
Ground
Body ground
Under any condition
1.0 or less
•  Related wiring harness
E
Motor operation (FRESH)
Air intake actuator
Switched to RECIRCULATE
1.0 or less
•  Related wiring harness
•  Air intake actuator
Switched to FRESH
B+
F
Sensor GND
Evaporator temperature sensor
Under any condition
1.0 or less
•  Related wiring harness
•  Evaporator temperature sensor
G
Blower fan ON/OFF signal
Fan switch
Fan stopped
B+
•  Related wiring harness
•  Resistor
•  Fan switch terminal voltage (D)
Fan on
1.0 or less
H
Evaporator temperature sensor input
Evaporator temperature sensor
Compared with temperature detected by evaporator temperature sensor
Refer to graph 1
•  Related wiring harness
•  Evaporator temperature sensor
•  Climate control unit: terminal voltage (F)
I
Blower fan position signal
Fan switch
3rd, 4th
1.0 or less
•  Related wiring harness
•  Resistor
•  Fan switch terminal voltage (D)
off, 1st, 2nd
B+
J
B+
ROOM 15 A fuse
Under any condition
B+
•  Related wiring harness
•  ROOM 15 A fuse
K
LIN
Front body control module (FBCM)
Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
•  Related wiring harness
•  Front body control module (FBCM)
L
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


Blower Fan Speed Control Signal


Fan stopped

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