CLIMATE CONTROL UNIT INSPECTION [MANUAL AIR CONDITIONER]

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Climate Control Unit With RECIRCULATE/FRESH Lever Type

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.)

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 H), replace the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)
―  For terminal H, 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 (Reference)

Terminal

Signal name

Connected to

Measurement condition

Voltage (V)

Inspection item(s)
A
—
—
—
—
—
B
—
—
—
—
—
C
—
—
—
—
—
D
Illumination (panel light control)
Instrument cluster
Light switch off
1.0 or less
Instrument cluster
Light switch on (TNS position) and panel light control MAX position
1.0 or less
Light switch on (TNS position) and panel light control MIN position
7.84
E
—
—
—
—
—
F
TNS signal
Electrical supply unit (ESU)
Light switch ON
B+
Electrical supply unit (ESU)
Light switch off
1.0 or less
G
A/C switch input
Instrument cluster
Ignition is switched ON (engine off or on) and A/C switch off
4.72
Instrument cluster
Ignition is switched ON (engine off or on) and A/C switch on
1.0 or less
H
—
—
—
—
—
I
—
—
—
—
—
J
IG1
C/U IG1 15 A
Ignition is switched ON (engine off or on)
B+
C/U IG1 15 A
Ignition is switched off
1.0 or less
K
—
—
—
—
—
L
—
—
—
—
—
M
GND
Instrument cluster
Under any condition
1.0 or less
Body ground
N
A/C switch illumination input
Instrument cluster
Ignition is switched ON (engine off or on)
B+
Instrument cluster
O
—
—
—
—
—
P
—
—
—
—
—
Q
—
—
—
—
—
R
—
—
—
—
—
S
Rear window defogger switch illumination
Instrument cluster
Rear window defogger switch off
12.22
Instrument cluster
Rear window defogger switch ON
1.686
T
—
—
—
—
—
U
Rear window defogger switch input
Instrument cluster
Ignition is switched ON (engine off or on) and rear window defogger switch off
4.72
Instrument cluster
Ignition is switched ON (engine off) and rear window defogger switch on
1.0 or less
V
—
—
—
—
—
W
MS CAN_H
CAN system related module
Terminal used for communication therefore determination based on terminal voltage is not possible.
X
MS CAN_L
CAN system related module
Terminal used for communication therefore determination based on terminal voltage is not possible.


Climate Control Unit With RECIRCULATE/FRESH Switch Type

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 [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 (Reference)

Terminal

Signal name

Connected to

Measurement condition

Voltage (V)

Inspection item(s)
A
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
B
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+
C
+5V
Air intake actuator
Under any condition
5
•  Related wiring harness
•  Air intake actuator
•  Climate control unit: terminal voltage (J)
D
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
E
Potentiometer input
Air intake actuator
RECIRCULATE
1.6
•  Related wiring harness
•  Air intake actuator
•  Climate control unit: terminal voltage (C)
FRESH
3.2
F
B+
•  INTERIOR 15 A
•  ROOM 25 A
Under any condition
B+
•  INTERIOR 15 A
•  ROOM 25 A
G
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
H
Blower fan speed control
Blower fan controller
(See Blower Fan Speed Control Signal)
•  Related wiring harness
•  Blower fan controller
I
GND
Body ground
Under any condition
1.0 or less
Body ground
J
Sensor GND
•  Air intake actuator
•  Evaporator temperature sensor
Under any condition
1.0 or less
•  Related wiring harness
•  Climate control unit: terminal voltage (C)
K
MS_CAN_H
CAN related module
Because this terminal is for communication, integrity determination by terminal voltage is not possible.
•  Related wiring harness
L
MS_CAN_L
CAN related module
Because this terminal is for communication, integrity determination by terminal voltage is not possible.
•  Related wiring harness

*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
•  H(+)—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
•  H(+)—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
•  H(+)—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
•  H(+)—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