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e5u740zw5103
CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER]
id0740a1802200
1. Switch the ignition to ON.
2. Connect the negative (-) lead of the tester to body ground.
3. 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)
e5u740zw5103
|
|
Terminal |
Signal name |
Connected to |
Measurement condition |
Voltage (V) |
Inspection item (s) |
|---|---|---|---|---|---|
|
A
|
IG2
|
A/C 7.5 A fuse
|
IG SW ON
|
B+
|
• Related wiring harness
• A/C 7.5 A fuse
|
|
IG SW LOCK
|
1.0 or less
|
||||
|
B
|
B+
|
ROOM 15 A fuse
|
Under any condition
|
B+
|
• Related wiring harness
• ROOM 15 A fuse
|
|
C
|
Blower fan speed control
|
Power MOS FET
|
Fan stopped
|
1.0 or less
|
• Related wiring harness
• Power MOS FET
|
|
Fan: manual 1 (LO) — 24
|
2.7—3.4
|
||||
|
Fan: manual 25 (HI)
|
9.6
|
||||
|
D
|
TNS signal
|
TNS relay
|
Headlight switch OFF
|
1.0 or less
|
• Related wiring harness
• TNS relay
• Headlight switch
|
|
Headlight switch ON
|
B+
|
||||
|
E
|
Blower motor feedback
|
Power MOS FET
|
Fan stopped
|
B+
|
1. Related wiring harness
2. Power MOS FET
3. Blower motor
4. Blower relay
5. HEATER 40 A fuse
6. Power MOS FET replacement
|
|
Fan: manual LO
|
8.17
|
||||
|
Fan: manual HI
|
0.6
|
||||
|
F
|
Panel control signal
|
Instrument cluster
|
Headlight switch OFF
|
0
|
• Related wiring harness
• Instrument cluster
• Climate control unit: terminal voltage (D)
|
|
Headlight switch ON
|
2.7
|
||||
|
G
|
Actuator power
|
• Air intake actuator
• Air mix actuator
• Airflow mode actuator
|
IG SW ON
|
B+
|
• Related wiring harness
• Air intake actuator
• Air mix actuator
• Airflow mode actuator
|
|
IG SW LOCK
|
1.0 or less
|
||||
|
H
|
GND
|
Body ground
|
Under any condition
|
1.0 or less
|
• Related wiring harness
|
|
I
|
Actuator operation signal
|
• Air intake actuator
• Air mix actuator
• Airflow mode actuator
|
Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
|
• Related wiring harness
• Air intake actuator
• Air mix actuator
• Airflow mode actuator
|
|
|
J
|
Ambient temperature output
|
Instrument cluster
|
Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
|
• Related wiring harness
• Instrument cluster
|
|
|
K
|
A/C
|
Refrigerant pressure switch
|
A/C switch ON, fan switch at 1st
|
1.0 or less
|
• Related wiring harness
• Refrigerant pressure switch
• PCM: terminal voltage (1AU)
|
|
A/C switch OFF
|
B+
|
||||
|
L
|
Vehicle speed
|
Instrument cluster
|
Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
|
• Related wiring harness
|
|
|
M
|
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
|
|
N
|
Rear window defroster operation
|
Rear window defroster relay
|
Rear window defroster switch OFF
|
B+
|
• Related wiring harness
• Rear window defroster relay
|
|
Rear window defroster switch ON
|
1.0 or less
|
||||
|
O
|
Cabin temperature sensor input
|
Cabin temperature sensor
|
Compared with temperature detected by cabin temperature sensor
|
Refer to graph 3
|
• Related wiring harness
• Cabin temperature sensor
|
|
Q
|
Solar radiation sensor input
|
Solar radiation sensor
|
Expose the solar radiation sensor to natural sunlight
|
4.7
|
• Related wiring harness
• Solar radiation sensor
|
|
Light to solar radiation sensor block
|
Below 1.0
|
||||
|
R
|
Water temperature input
|
Instrument cluster
|
Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
|
• Related wiring harness
• Instrument cluster
|
|
|
S
|
Sensor GND
|
• Ambient temperature sensor
• Cabin temperature sensor
• Evaporator temperature sensor
• Solar radiation sensor
|
Under any condition
|
1.0 or less
|
• Related wiring harness
|
|
T
|
Ambient temperature sensor input
|
Ambient temperature sensor
|
Compared with temperature detected by ambient temperature sensor
|
Refer to graph 2
|
• Related wiring harness
• Ambient temperature sensor
|
 |
 |
 |
—
|