CLIMATE CONTROL UNIT INSPECTION [MANUAL AIR CONDITIONER]
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1. Remove the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL [MANUAL AIR CONDITIONER].)
2. Disconnect the air mix wire from the climate control unit
3. Install the audio unit. (See AUDIO UNIT REMOVAL/INSTALLATION.)
4. Connect the climate control unit connector.
5. Connect the negative (-) lead of the tester to body ground.
6. Turn the ignition switch to the ON position.
7. By inserting the positive (+) lead of the tester into each climate control unit terminal, measure the voltage according to the terminal voltage table.
Terminal Voltage Table (Reference)
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|
|
Terminal |
Signal name |
Connected to |
Measurement condition |
Voltage (V) |
Inspection item (s) |
|---|---|---|---|---|---|
|
A
|
Illumination control
|
Instrument cluster
|
Headlight switch ON and panel light control switch at max
|
0.45
|
• Wiring harness: continuity (Climate control unit—instrument cluster: A—2H) (Instrument cluster—body ground: 2A—GND)
• Instrument cluster
|
|
Headlight switch ON and panel light control switch at min
|
9.96
|
• Wiring harness: short circuit (Climate control unit—instrument cluster: A—2H)
|
|||
|
B
|
TNS signal
|
TNS relay
|
Headlight switch OFF
|
1.0 or less
|
• Wiring harness: short circuit (Climate control unit—TNS relay: B—C)
• TNS relay
• Headlight switch
|
|
Headlight switch ON
|
B+
|
• Wiring harness: continuity, short circuit (Climate control unit—TNS relay: B—C)
• TNS relay
• Headlight switch
|
|||
|
C
|
—
|
—
|
—
|
—
|
—
|
|
D
|
—
|
—
|
—
|
—
|
—
|
|
E
|
+5V
|
Airflow mode actuator
|
IG SW ON
|
4.91
|
• Wiring harness: short circuit (Climate control unit—airflow mode actuator: E—B)
• Airflow mode actuator
• Climate control unit: terminal voltage (R, L)
|
|
IG SW OFF
|
1.0 or less
|
• Climate control unit replacement
|
|||
|
F
|
FAN ON/OFF
|
Fan switch
|
Fan switch ON
|
0.06
|
• Wiring harness: (Climate control unit—Fan switch: F—C)
• Fan switch
|
|
Fan switch OFF
|
12.18
|
• Wiring harness: continuity (Climate control unit—fan switch: F—C)
• Climate control unit: terminal voltage (R)
• Fan switch
|
|||
|
G
|
Potentiometer input
|
Airflow mode actuator
|
VENT
|
4.20
|
• Wiring harness: continuity, short circuit (Climate control unit— airflow mode actuator: G—C)
• Airflow mode actuator
• Climate control unit: terminal voltage (E)
|
|
BILEVEL
|
3.34
|
||||
|
HEAT
|
2.44
|
||||
|
HEAT/DEF
|
1.56
|
||||
|
DEFROSTER
|
0.68
|
||||
|
H
|
Rear window defroster switch
|
Rear window defroster relay
|
Rear window defroster switch OFF
|
B+
|
• Wiring harness: continuity, short circuit (Climate control unit—rear window defroster relay: H—E)
• Rear window defroster relay
|
|
Rear window defroster switch ON
|
0.06
|
• Climate control unit: terminal voltage (L, R)
• Climate control unit:
|
|||
|
I
|
Evaporator temperature sensor input
|
Evaporator temperature sensor
|
Compared with temperature detected by evaporator temperature sensor
|
Refer to graph 2
|
• Wiring harness: continuity (Climate control unit—evaporator temperature sensor: I—B, K—A)
• Wiring harness: short circuit (Climate control unit—evaporator temperature sensor: I—B)
• Evaporator temperature sensor
• Climate control unit: terminal voltage (L, R)
|
|
J
|
A/C
|
BCM
|
A/C switch ON, Fan switch at 1st
|
0.03
|
• Wiring harness: continuity (Climate control unit—BCM: J—3V)
• BCM
|
|
A/C switch OFF
|
5.02
|
• Wiring harness: continuity, short circuit (Climate control unit—BCM: J—3V)
|
|||
|
K
|
Sensor GND
|
• Evaporator temperature sensor
• Ambient temperature sensor
• Airflow mode actuator
|
Under any condition
|
1.0 or less
|
• Climate control unit: terminal voltage (L)
|
|
L
|
GND
|
Body ground
|
Under any condition
|
1.0 or less
|
• Wiring harness: continuity (Climate control unit—GND: L—GND)
|
|
M
|
—
|
—
|
—
|
—
|
—
|
|
N
|
—
|
—
|
—
|
—
|
—
|
|
O
|
—
|
—
|
—
|
—
|
—
|
|
P
|
B+
|
ROOM 15 A fuse
|
Under any condition
|
B+
|
• Wiring harness: continuity, short circuit (Climate control unit— fuse: P—ROOM 15 A)
• ROOM 15 A fuse
|
|
Q
|
Motor operation
|
Airflow mode actuator
|
Moving towards DEFROSTER
|
10.60
|
• Wiring harness: continuity, short circuit (Climate control unit—airflow mode actuator: Q—F, S—D)
• Airflow mode actuator
|
|
Moving towards VENT
|
0.69
|
||||
|
R
|
IG2
|
A/C 10 A fuse
|
IG SW ON
|
B+
|
• Wiring harness: continuity, short circuit (Climate control unit— fuse: R—A/C 10 A)
• A/C 10 A fuse
|
|
IG SW OFF
|
1.0 or less
|
• Wiring harness: continuity, short circuit (Climate control unit— fuse: R—A/C 10 A)
|
|||
|
S
|
Motor operation
|
Airflow mode actuator
|
Moving towards VENT
|
10.64
|
• Wiring harness: continuity, short circuit (Climate control unit—airflow mode actuator: S—D, Q—F)
• Airflow mode actuator
|
|
Moving towards DEFROSTER
|
0.68
|
||||
|
T
|
—
|
—
|
—
|
—
|
—
|
|
U
|
—
|
—
|
—
|
—
|
—
|
|
V
|
Motor operation
|
Air intake actuator
|
Moving towards RECIRCULATE
|
10.62
|
• Wiring harness: continuity, short circuit (Climate control unit—air intake actuator: V—F, X—D)
• Air intake actuator
|
|
Moving towards FRESH
|
0.66
|
||||
|
W
|
Ambient temperature sensor input
|
Ambient temperature sensor
|
Compared with temperature detected by ambient temperature sensor
|
Refer to graph 1
|
• Wiring harness: continuity (Climate control unit—ambient temperature sensor: W—B, K—A)
• Wiring harness: short circuit (Climate control unit—ambient temperature sensor: W—B)
• Ambient temperature sensor
• Climate control unit: terminal voltage (L, R)
|
|
X
|
Motor operation
|
Air intake actuator
|
Moving towards FRESH
|
10.64
|
• Wiring harness: continuity, short circuit (Climate control unit—air intake actuator: X—D, V—F)
• Air intake actuator
|
|
Moving towards RECIRCULATE
|
0.67
|
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