FRONT CLIMATE CONTROL UNIT INSPECTION

id074000805100

ac8wzw00003294

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

2.  Remove the following parts:

(1)  Console side panel (See CONSOLE SIDE PANEL REMOVAL/INSTALLATION.)
(2)  Selector lever knob (See SELECTOR LEVER COMPONENT REMOVAL/INSTALLATION.)
(3)  Shift panel (See SHIFT PANEL REMOVAL/INSTALLATION.)
(4)  Front console (See FRONT CONSOLE BOX REMOVAL/INSTALLATION.)
(5)  Side wall (See SIDE WALL REMOVAL/INSTALLATION.)
(6)  Rear console panel (See REAR CONSOLE PANEL REMOVAL/INSTALLATION.)
(7)  Rear cooler duct (See REAR COOLER DUCT REMOVAL/INSTALLATION.)
(8)  Rear console (See REAR CONSOLE REMOVAL/INSTALLATION.)
(9)  Lower decoration panel (See DECORATION PANEL REMOVAL/INSTALLATION.)
(10)  Upper decoration panel (See DECORATION PANEL REMOVAL/INSTALLATION.)
(11)  Driver-side front scuff plate (See FRONT SCUFF PLATE REMOVAL/INSTALLATION.)
(12)  Driver-side front side trim (See FRONT SIDE TRIM REMOVAL/INSTALLATION.)
(13)  Bonnet release lever (See BONNET RELEASE LEVER AND RELEASE CABLE REMOVAL/INSTALLATION.)
(14)  Fuel-filler lid opener lever (See FUEL-FILLER LID OPENER AND LEVER REMOVAL/INSTALLATION.)
(15)  Driver-side lower panel (See LOWER PANEL REMOVAL/INSTALLATION.)
(16)  Center lower panel (See CENTER LOWER PANEL REMOVAL/INSTALLATION.)

3.  Remove the front climate control unit with the connector connected. (See FRONT CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.)

4.  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.)

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 front 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, replace the front climate control unit. (See FRONT CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.)

ac9uuw00007359

Terminal voltage table (reference)

Terminal

Signal name

Connected to

Measurement condition

Voltage (V)

Inspection item (s)
1A
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
•  Front climate control unit: terminal voltage (1Q)
1B
Potentiometer input
Front airflow mode actuator
VENT
0.8
•  Related wiring harness
•  Front airflow mode actuator
•  Front climate control unit: terminal voltage (1C)
BI-LEVEL
1.4
HEAT
2.3
HEAT/DEF
2.9
DEFROSTER
3.8
1C
+5V
•  Air intake actuator
•  Driver-side front air mix actuator
•  Passenger-side front air mix actuator
•  Front airflow mode actuator
•  Solar radiation sensor
Under any condition
5
•  Related wiring harness
•  Air intake actuator
•  Driver-side front air mix actuator
•  Passenger-side front air mix actuator
•  Front airflow mode actuator
•  Solar radiation sensor
•  Front climate control unit: terminal voltage (1Q)
1D
Potentiometer input
Air intake actuator
Moving towards RECIRCULATE
3.8
•  Related wiring harness
•  Air intake actuator
•  Front climate control unit: terminal voltage (1C)
Moving towards FRESH
1.4
1E
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
•  Front climate control unit: terminal voltage (1Q)
1F
Solar radiation sensor (RH) input
Solar radiation sensor
Sunlight shined directly on solar radiation sensor
4
•  Related wiring harness
•  Front climate control unit: terminal voltage (1C)
•  Solar radiation sensor
Blocking light to solar radiation sensor
1.0 or less
1G
—
—
—
—
—
1H
Solar radiation sensor (LH) input
Solar radiation sensor
Sunlight shined directly on solar radiation sensor
4
•  Related wiring harness
•  Front climate control unit: terminal voltage (1C)
•  Solar radiation sensor
Blocking light to solar radiation sensor
1.0 or less
1I
GND
Body ground
Under any condition
1.0 or less
•  Related wiring harness
1J
Motor operation (HOT)
Passenger-side front air mix actuator
Moving towards HOT
B+
•  Related wiring harness
•  Passenger-side front air mix actuator
Moving towards COLD
1.0 or less
1K
MS_CAN_H
CAN related module
Because this terminal is for communication, integrity determination by terminal voltage is not possible.
1L
Motor operation (COLD)
Passenger-side front air mix actuator
Moving towards HOT
1.0 or less
•  Related wiring harness
•  Passenger-side front air mix actuator
Moving towards COLD
B+
1M
MS_CAN_L
CAN related module
Because this terminal is for communication, integrity determination by terminal voltage is not possible.
1N
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
1O
LIN
Rear climate control unit
Because this terminal is for communication, integrity determination by terminal voltage is not possible.
1P
—
—
—
—
—
1Q
Sensor GND
•  Air intake actuator
•  Driver-side front air mix actuator
•  Passenger-side front air mix actuator
•  Front airflow mode actuator
•  Evaporator temperature sensor
•  Cabin temperature sensor
Under any condition
1.0 or less
•  Related wiring harness
•  Front climate control unit: terminal voltage (1C)
1R
—
—
—
—
—
1S
—
—
—
—
—
1T
Blower fan speed control
Front blower motor
(See Blower fan speed control signal.)
•  Related wiring harness
•  Front blower motor
1U
B+
•  ROOM 15 A fuse
Under any condition
B+
•  Related wiring harness
•  ROOM 15 A fuse
1V
—
—
—
—
—
1W
IG1
•  IGNITION relay (IG1_STAB)
•  METER2 7.5A fuse
Switch the ignition ON (engine off or on)
B+
Related wiring harness
Switch the ignition off
1.0 or less
1X*
Front seat warmer switch signal
Front seat warmer control unit
Because this terminal is for communication, integrity determination by terminal voltage is not possible.
Seat ventilation switch signal
2A
Motor operation (HOT)
Driver-side front air mix actuator
Moving towards HOT
B+
•  Related wiring harness
•  Driver-side front air mix actuator
Moving towards COLD
1.0 or less
2B
Motor operation (DEFROSTER)
Front airflow mode actuator
Moving towards DEFROSTER
B+
•  Related wiring harness
•  Front airflow mode actuator
Moving towards VENT
1.0 or less
2C
Motor operation (COLD)
Driver-side front air mix actuator
Moving towards HOT
1.0 or less
•  Related wiring harness
•  Driver-side front air mix actuator
Moving towards COLD
B+
2D
Motor operation (VENT)
Front airflow mode actuator
Moving towards VENT
B+
•  Related wiring harness
•  Front airflow mode actuator
Moving towards DEFROSTER
1.0 or less
2E
—
—
—
—
—
2F
Motor operation (RECIRCULATE)
Air intake actuator
Moving towards RECIRCULATE
B+
•  Related wiring harness
•  Air intake actuator
Moving towards FRESH
1.0 or less
2G
—
—
—
—
—
2H
Motor operation (FRESH)
Air intake actuator
Moving towards RECIRCULATE
1.0 or less
•  Related wiring harness
•  Air intake actuator
Moving towards FRESH
B+
2I
Potentiometer input
Driver-side front air mix actuator
Set temperature at MAX HOT
4.2
•  Related wiring harness
•  Driver-side front air mix actuator
•  Front climate control unit: terminal voltage (1C)
Set temperature at MAX COLD
0.6
2J
—
—
—
—
—
2K
Potentiometer input
Passenger-side front air mix actuator
Set temperature at MAX HOT
4.3
•  Related wiring harness
•  Passenger-side front air mix actuator
•  Front climate control unit: terminal voltage (1C)
Set temperature at MAX COLD
0.6
2L
—
—
—
—
—

*  :Front climate control unit type B with front seat warmer system or seat ventilation system


Blower fan speed control signal


Fan stopped

ac9uuw00009654
Front climate control unit terminal
•  1T(+)—body ground(-)
Oscilloscope setting
•  2 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
•  Switch the ignition ON (engine off or on)
Front climate control unit condition
•  OFF


Manual 1st

ac9uuw00009655
Front climate control unit terminal
•  1T(+)—body ground(-)
Oscilloscope setting
•  2 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
•  Switch the ignition ON (engine off or on)
Front climate control unit condition
•  Airflow mode: VENT
•  Air intake mode: RECIRCULATE


Manual 3rd

ac9uuw00009656
Front climate control unit terminal
•  1T(+)—body ground(-)
Oscilloscope setting
•  2 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
•  Switch the ignition ON (engine off or on)
Front climate control unit condition
•  Airflow mode: VENT
•  Air intake mode: RECIRCULATE


Manual 5th

ac9uuw00009657
Front climate control unit terminal
•  1T(+)—body ground(-)
Oscilloscope setting
•  2 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
•  Switch the ignition ON (engine off or on)
Front climate control unit condition
•  Airflow mode: VENT
•  Air intake mode: RECIRCULATE


Manual 7th

ac9uuw00009658
Front climate control unit terminal
•  1T(+)—body ground(-)
Oscilloscope setting
•  2 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
•  Switch the ignition ON (engine off or on)
Front climate control unit condition
•  Airflow mode: VENT
•  Air intake mode: RECIRCULATE