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CLIMATE CONTROL UNIT INSPECTION

CLIMATE CONTROL UNIT INSPECTION


id074000802200


Full-auto Air Conditioner

1.  Connect the all center panel connectors.

2.  Turn the ignition switch to ON position.

3.  Measure the voltage at each climate control unit terminal and refer to the terminal voltage list.

•  If not as specified, inspect the parts listed under “Action” and the related wiring harness.
―  If there is any malfunction, replace the climate control unit.


Terminal Voltage List (Reference)

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Terminal

Signal

Connected to

Test condition

Voltage (V)

Action

1A
Blower motor feedback signal
•  Blower motor
•  Power MOS FET
Fan switch is OFF
12
1.  Inspect for continuity or short circuit (Climate control unit—blower motor: 1A—A) (Climate control unit—power MOS FET: 1A—B, 1C—E) (Blower motor—blower relay: B—C) (Blower relay—fuse: D—BLOWER 40 A fuse)
2.  Inspect for continuity (Power MOS FET—ground: A—GND) (Blower relay—ground: A—GND)
3.  Inspect power MOS FET
4.  Inspect blower motor
5.  Inspect blower relay
6.  Inspect BLOWER 40 A fuse
7.  Replace power MOS FET
Fan switch is at manual LO
7.8
Fan switch is at manual HI
0.2
1B
+5 V
•  Air mix actuator
•  Airflow mode actuator
•  Solar radiation sensor
Ignition switch at ON position
5.0
•  Inspect for short circuit (Climate control unit— air mix actuator, airflow mode actuator, solar radiation sensor: 1B—A (L.H.D.) or B (R.H.D.), B, A)
•  Inspect air mix actuator
•  Inspect airflow mode actuator
•  Inspect solar radiation sensor
•  Inspect terminal voltage of climate control unit connector (2H, 2L)
Ignition switch at LOCK position
Below 1.0
•  Replace climate control unit
1C
Blower motor control signal
Power MOS FET
Fan switch is OFF
Below 1.0
•  Inspect terminal voltage of climate control unit (1A)
Fan switch is at manual LO
4.1
Fan switch is at manual HI
7.9
1D
1E
Rear window defroster SW signal
Rear window defroster relay
Rear window defroster switch is off
12
•  Inspect for continuity or short circuit (Climate control unit—rear window defroster relay: 1E—E)
•  Inspect rear window defroster relay
Rear window defroster switch is on
Below 1.0
•  Inspect terminal voltage of climate control unit (2H, 2L)
•  Inspect center panel
1F
On-board diagnostic signal
A/C check connector
Terminal A of A/C check connector is shorted.
Below 1.0
•  Inspect for continuity (Climate control unit—A/C check connector: 1F—A)
Other
5.4
•  Inspect short circuit (Climate control unit—A/C check connector: 1F—A)
•  Inspect terminal voltage of climate control unit (2H, 2L)
1G
1H
1I
GND
•  Cabin temperature sensor
•  Evaporator temperature sensor
•  Ambient temperature sensor
•  Water temperature sensor
•  Air mix actuator
•  Airflow mode actuator
Under any condition
Below 1.0
•  Inspect terminal voltage of climate control unit (2L)
1J
Water heater select (MZR-CD (RF Turbo))
Ground
Under any condition
Below 1.0
•  Inspect for continuity (Climate control unit—ground: 1J—GND)
•  Inspect center panel
1K
Ambient temperature sensor input
Ambient temperature sensor
Depends on temperature surrounding sensor
See Figure 2
•  Inspect for continuity (Climate control unit— ambient temperature sensor: 1K—B, 1I—A)
•  Inspect for short circuit (Climate control unit— ambient temperature sensor: 1K—B)
•  Inspect ambient temperature sensor
•  Inspect terminal voltage of climate control unit (2H, 2L)
1L
MZR-CD (RF Turbo) select
Ground
Under any condition
Below 1.0
•  Inspect for continuity (Climate control unit—ground: 1L—GND)
•  Inspect center panel
1M
Cabin temperature sensor input
Cabin temperature sensor
Depends on temperature surrounding sensor
See Figure 3
•  Inspect for continuity (Climate control unit— cabin temperature sensor: 1M—B, 1I—A)
•  Inspect for short circuit (Climate control unit— cabin temperature sensor: 1M—B)
•  Inspect cabin temperature sensor
•  Inspect terminal voltage of climate control unit (2H, 2L)
1N
1O
Water temperature sensor input
Water temperature sensor
Depends on temperature surrounding sensor
See Figure 4
•  Inspect for continuity (Climate control unit—water temperature sensor: 1O—A, 1I—B)
•  Inspect for short circuit (Climate control unit—water temperature sensor: 1O—A)
•  Inspect water temperature sensor
•  Inspect terminal voltage of climate control unit (2H, 2L)
1P
A/C
Refrigerant pressure switch
Fan switch at OFF
12
•  Inspect for continuity or short circuit (Climate control unit—refrigerant pressure switch: 1P—A (Dual-pressure type), 1P—C (Triple-pressure type)) (Refrigerant pressure switch—PCM: B—1AC (except MZR-CD (RF Turbo)), 84 (MZR-CD (RF Turbo)))
•  Inspect refrigerant pressure switch
•  Inspect PCM terminal voltage (1AC (except MZR-CD (RF Turbo)), 84 (MZR-CD (RF Turbo)))
Fan switch at 1st position, A/C switch ON
Below 1.0
•  Inspect terminal voltage of climate control unit (2H, 2L)
1Q
Evaporator temperature sensor input signal
Evaporator temperature sensor
Depends on temperature surrounding sensor
See Figure 1
•  Inspect for continuity (Climate control unit— evaporator temperature sensor: 1Q—B, 1I—A)
•  Inspect for short circuit (Climate control unit— evaporator temperature sensor: 1Q—B)
•  Inspect evaporator temperature sensor
•  Inspect terminal voltage of climate control unit (2H, 2L)
1R
1S
Solar radiation sensor input
Solar radiation sensor
Incandescent light (60W) shining on solar radiation sensor from distance of approx. 100mm {3.9 in}
4.0
•  Inspect for continuity or short circuit (Climate control unit—solar radiation sensor: 1S—B, 1B—A)
•  Inspect terminal voltage of climate control unit (1B)
•  Inspect solar radiation sensor
Light to solar radiation sensor block
Below 1.0
1T
GND
Ground
Under any condition
Below 1.0
•  Inspect for continuity (Climate control unit—ground: 1T—GND)
•  Inspect center panel
1U
Potentiometer signal
Air mix actuator
Set temperature at MAX COLD
0.6
•  Inspect for continuity or short circuit (Climate control unit—air mix actuator: 1U—C)
•  Inspect air mix actuator
•  Inspect terminal voltage of climate control unit (1B)
Set temperature at MAX HOT
4.3
1V
1W
Potentiometer signal
Airflow mode actuator
VENT mode
4.3
•  Inspect for continuity or short circuit (Climate control unit—airflow mode actuator: 1W—C)
•  Inspect airflow mode actuator
•  Inspect terminal voltage of climate control unit (1B)
BI-LEVEL mode
3.3
HEAT mode
2.3
HEAT/DEF mode
1.5
DEFROSTER mode
0.6
1X
Hazard warning SW signal
Hazard warning switch
Hazard warning switch is off
12
•  Inspect for continuity or short circuit (Climate control unit—flasher unit: 1X—H)
•  Inspect flasher unit
Hazard warning switch is on
Below 1.0
•  Inspect terminal voltage of climate control unit (1T)
•  Inspect center panel
2A
Panel light control signal
Panel light control switch
Headlight switch ON and panel light control switch at max. illumination
0.2
•  Inspect for continuity (Climate control unit— panel light control switch: 2A—C) (Panel light control switch—ground: C—GND)
•  Inspect panel light control switch
Headlight switch ON and panel light control switch at min. illumination
10.2
•  Inspect for short circuit (Climate control unit— panel light control switch: 2A—C)
2B
TNS signal
TNS relay
Headlight switch OFF
Below 1.0
•  Inspect for short circuit (Climate control unit—TNS relay: 2B—D)
•  Inspect TNS relay
•  Inspect headlight switch
Headlight switch ON
12
•  Inspect for continuity or short circuit (Climate control unit—TNS relay: 2B—D)
•  Inspect TNS relay
•  Inspect headlight switch
2C
Motor drive signal
Air mix actuator
Moving to COLD
12
•  Inspect for continuity or short circuit (Climate control unit—air mix actuator: 2D—F (L.H.D.) or D (R.H.D.), 2C—D (L.H.D.) or F (R.H.D.))
•  Inspect air mix actuator
Moving to HOT
Below 1.0
2D
Motor drive signal
Air mix actuator
Moving to HOT
12
•  Inspect for continuity or short circuit (Climate control unit—air mix actuator: 2C—D (L.H.D.) or F (R.H.D.), 2D—F (L.H.D.) or D (R.H.D.))
•  Inspect air mix actuator
Moving to COLD
Below 1.0
2E
Motor drive signal
Airflow mode actuator
Moving to DEFROSTER
12
•  Inspect for continuity or short circuit (Climate control unit—airflow mode actuator: 2E—F, 2G—D)
•  Inspect airflow mode actuator
Moving to VENT
Below 1.0
2F
Backup power supply
ROOM 15 A fuse
Under any condition
B+
•  Inspect for continuity or short circuit (Climate control unit—fuse: 2F— ROOM 15 A fuse)
•  Inspect ROOM 15 A fuse
2G
Motor drive signal
Airflow mode actuator
Moving to VENT
12
•  Inspect for continuity or short circuit (Climate control unit—airflow mode actuator: 2G—D, 2E—F)
•  Inspect airflow mode actuator
Moving to DEFROSTER
Below 1.0
2H
IG2
A/C 10 A fuse
Ignition switch at ON position
B+
•  Inspect for continuity or short circuit (Climate control unit—fuse: 2H—A/C 10 A fuse)
•  Inspect A/C 10 A fuse
Ignition switch at LOCK position
Below 1.0
•  Inspect for short circuit (Climate control unit—fuse: 2H—A/C 10 A fuse)
2I
Motor drive signal
Air intake actuator
Moving to RECIRCULATE
12
•  Inspect for continuity or short circuit (Climate control unit—air intake actuator: 2I—F, 2K—D)
•  Inspect air intake actuator
Moving to FRESH
Below 1.0
2J
2K
Motor drive signal
Air intake actuator
Moving to FRESH
12
•  Inspect for continuity or short circuit (Climate control unit—air intake actuator: 2K—D, 2I—F)
•  Inspect air intake actuator
Moving to RECIRCULATE
Below 1.0
2L
GND
Ground
Under any condition
Below 1.0
•  Inspect for continuity (Climate control unit—ground: 2L—GND)