CLIMATE CONTROL UNIT INSPECTION [MANUAL AIR CONDITIONER]


id0740a2802200

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.

•  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 climate control unit.


Terminal Voltage Table (Reference)

acxuuw00000989

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