CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER]

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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.

  • 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)

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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

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