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am6zzw00001077
CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER]
id0740a1802200
1. Remove the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
2. Connect the climate control unit connector.
3. Connect the negative (-) lead of the tester to body ground.
4. Switch the ignition to ON position.
5. 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)
am6zzw00001077
|
|
Terminal |
Signal name |
Connected to |
Measurement condition |
Voltage (V) |
Inspection item (s) |
|---|---|---|---|---|---|
|
1A
|
MS_CAN_H
|
CAN related module
|
Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
|
• Related wiring harness
|
|
|
1B
|
MS_CAN_L
|
CAN related module
|
Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
|
• Related wiring harness
|
|
|
1C
|
—
|
—
|
—
|
—
|
—
|
|
1D
|
GND
|
Body ground
|
Under any condition
|
1.0 or less
|
• Related wiring harness
• ROOM 15 A fuse
|
|
1E
|
B+
|
ROOM 15 A fuse
|
Under any condition
|
B+
|
|
|
1F
|
Illumination control
|
Instrument cluster
|
Headlight switch ON and panel light control switch at max
|
1.0 or less
|
• Related wiring harness
• Instrument cluster
|
|
Headlight switch ON and panel light control switch at min
|
11.5
|
||||
|
1G
|
IG2
|
AIR COND 10 A fuse
|
IG SW ON
|
B+
|
• Related wiring harness
• AIR COND 10 A fuse
|
|
IG SW OFF
|
1.0 or less
|
||||
|
1H
|
—
|
—
|
—
|
—
|
—
|
|
1I
|
Blower fan speed control
|
Power MOS FET
|
Fan stopped
|
1.0 or less
|
• Climate control unit: terminal voltage (1J)
|
|
Fan: manual LO
|
3.01
|
||||
|
Fan: manual HI
|
9.64
|
||||
|
1J
|
Blower motor feed back
|
• Blower motor
• Power MOS FET
|
Fan stopped
|
B+
|
• Related wiring harness
• Power MOS FET
• Blower motor
|
|
Fan: manual LO
|
9.1
|
||||
|
Fan: manual HI
|
1.0 or less
|
||||
|
1K
|
Motor operation
|
Airflow mode actuator
|
Moving towards DEFROSTER
|
B+
|
• Related wiring harness
• Airflow mode actuator
|
|
Moving towards VENT
|
1.0 or less
|
||||
|
1L
|
Motor operation (RECIRCULATE)
|
Air intake actuator
|
Moving towards RECIRCULATE
|
B+
|
• Related wiring harness
• Air intake actuator
|
|
Moving towards FRESH
|
1.0 or less
|
||||
|
1M
|
Motor operation
|
Airflow mode actuator
|
Moving towards VENT
|
B+
|
• Related wiring harness
• Airflow mode actuator
|
|
Moving towards DEFROSTER
|
1.0 or less
|
||||
|
1N
|
Motor operation (FRESH)
|
Air intake actuator
|
Moving towards RECIRCULATE
|
1.0 or less
|
• Related wiring harness
• Air intake actuator
|
|
Moving towards FRESH
|
B+
|
||||
|
1O
|
Motor operation (HOT)
|
Passenger’s side air mix actuator
|
Moving towards HOT
|
B+
|
• Related wiring harness
• Passenger’s side air mix actuator
|
|
Moving towards COLD
|
1.0 or less
|
||||
|
1P
|
Motor operation (HOT)
|
Driver’s side air mix actuator
|
Moving towards HOT
|
B+
|
• Related wiring harness
• Driver’s side air mix actuator
|
|
Moving towards COLD
|
1.0 or less
|
||||
|
1Q
|
Motor operation (COLD)
|
Passenger’s side air mix actuator
|
Moving towards HOT
|
1.0 or less
|
• Related wiring harness
• Passenger’s side air mix actuator
|
|
Moving towards COLD
|
B+
|
||||
|
1R
|
Motor operation (COLD)
|
Driver’s side air mix actuator
|
Moving towards HOT
|
1.0 or less
|
• Related wiring harness
• Driver’s side air mix actuator
|
|
Moving towards COLD
|
B+
|
||||
|
1S
|
Rear window defroster switch
|
Rear window defroster relay
|
Rear window defroster switch OFF
|
B+
|
• Related wiring harness
• Rear window defroster relay
• Climate control unit: terminal voltage (1S)
• Climate control unit
|
|
Rear window defroster switch ON
|
1.0 or less
|
||||
|
1T*1
|
PTC relay
|
PTC heater relay
|
PTC heater operation
|
1.0 or less
|
• Related wiring harness
• PTC heater relay
|
|
PTC heater stopped
|
B+
|
||||
|
1U
|
A/C on
|
Refrigerant pressure switch
|
A/C off
|
B+
|
• Related wiring harness
|
|
A/C on
|
1.0 or less
|
||||
|
1V
|
—
|
—
|
—
|
—
|
—
|
|
1W
|
TNS signal
|
Auto light/wiper control module
|
Headlight switch ON
|
B+
|
• Related wiring harness
• Auto light/wiper control module
• Headlight switch
|
|
Headlight switch OFF
|
1.0 or less
|
||||
|
1X
|
—
|
—
|
—
|
—
|
—
|
|
2A
|
Potentiometer input
|
Passenger’s side air mix actuator
|
Set temperature at MAX COLD
|
1.0 or less
|
• Related wiring harness
• Passenger’s side air mix actuator
• Climate control unit: terminal voltage (2K)
|
|
Set temperature at MAX HOT
|
4.29 or more
|
||||
|
2B
|
Potentiometer input
|
Airflow mode actuator
|
VENT
|
4.33 or more
|
• Related wiring harness
• Airflow mode actuator
• Climate control unit: terminal voltage (2K)
|
|
BILEVEL
|
3.42
|
||||
|
HEAT
|
2.50
|
||||
|
HEAT/DEF
|
1.58
|
||||
|
DEFROSTER
|
1.0 or less
|
||||
|
2C
|
Potentiometer input
|
Driver’s side air mix actuator
|
Set temperature at MAX HOT
|
4.2 or more
|
• Related wiring harness
• Driver’s side air mix actuator
• Climate control unit: terminal voltage (2K)
|
|
Set temperature at MAX COLD
|
1.0 or less
|
||||
|
2D
|
Solar radiation sensor input
|
Solar radiation sensor (LH)
|
Fluorescent light shined directly on the solar radiation sensor
|
9.4
|
• Related wiring harness
• Climate control unit: terminal voltage (2K)
• Solar radiation sensor
|
|
Blocking light to solar radiation sensor
|
0.1 or less
|
||||
|
2E
|
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
• Climate control unit: terminal voltage (1D,1G)
|
|
2F
|
Solar radiation sensor input
|
Solar radiation sensor (RH)
|
Fluorescent light shined directly on the solar radiation sensor
|
8.2
|
• Related wiring harness
• Climate control unit: terminal voltage (2K)
• Solar radiation sensor
|
|
Blocking light to solar radiation sensor
|
0.1 or less
|
||||
|
2G
|
—
|
—
|
—
|
—
|
—
|
|
2H
|
—
|
—
|
—
|
—
|
—
|
|
2I
|
Cabin temperature sensor input
|
Cabin temperature sensor
|
Compared with temperature detected by cabin temperature sensor
|
Refer to graph 2
|
• Related wiring harness
• Cabin temperature sensor
• Climate control unit: terminal voltage (2K)
|
|
2J
|
—
|
—
|
—
|
—
|
—
|
|
2K
|
+5V
|
• Driver’s side air mix actuator
• Passenger’s side air mix actuator
• Airflow mode actuator
• Solar radiation sensor
|
IG SW ON
|
5
|
• Related wiring harness
• Driver’s side air mix actuator
• Passenger’s side air mix actuator
• Airflow mode actuator
• Solar radiation sensor
• Climate control unit: terminal voltage (1D)
|
|
IG SW OFF
|
1.0 or less
|
||||
|
2L
|
Sensor GND
|
• Ambient temperature sensor
• Cabin temperature sensor
• Evaporator temperature sensor
• Air mix actuator
• Airflow mode actuator
|
Under any condition
|
1.0 or less
|
• Climate control unit: terminal voltage (1D)
|
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