1. Remove the climate control unit with the connector connected. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
2. Switch the ignition ON (engine off or on).
3. Connect the negative (-) lead of the tester to body ground.
4. Insert the positive (+) lead of the tester into each climate control unit terminal and 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 (except for terminal 1E), replace the climate control unit.
For terminal 1E, first try replacing the blower fan controller. If there is still any malfunction, replace the climate control unit.
| Terminal | Signal name | Connected to | Measurement condition | Voltage (V) | Inspection item (s) |
| 1A | GND | Body ground | Under any condition | 1.0 or less |
|
| 1B | B+ | ROOM 15 A fuse | Under any condition | B+ |
|
| 1C | — | — | — | — | — |
| 1D | IG1 | C/U IG1 15 A fuse | Switch the ignition ON (engine off or on) | B+ |
|
| Switch the ignition off | 1.0 or less |
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| 1E | Blower fan speed control | Blower fan controller | Switch the ignition off | 1.0 or less |
|
| Fan stopped (Switch the ignition ON (engine off or on)) | 2.5 |
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| Fan: manual 1st | 3.7 |
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| Fan: manual 3rd | 6.9 |
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| Fan: manual 7th | B+ |
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| 1F | IG2 | Front body control module (FBCM) | Switch the ignition ON (engine off or on) | B+ |
|
| Switch the ignition off | 1.0 or less |
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| 1G | — | — | — | — | — |
| 1H | Passenger compartment temperature sensor input | Passenger compartment temperature sensor | Compared with temperature detected by passenger compartment temperature sensor | Refer to graph 1 |
|
| 1I | — | — | — | — | — |
| 1J | Sensor GND |
| Under any condition | 1.0 or less |
|
| 1K | — | — | — | — | — |
| 1L | Evaporator temperature sensor input | Evaporator temperature sensor | Compared with temperature detected by evaporator temperature sensor | Refer to graph 2 |
|
| 1M | Solar radiation sensor (LH) input | Solar radiation sensor | Sunlight shined directly on solar radiation sensor | 4 |
|
| Blocking light to solar radiation sensor | 1.0 or less |
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| 1N | +5V |
| Under any condition | 5 |
|
| 1O | Solar radiation sensor (RH) input | Solar radiation sensor | Sunlight shined directly on solar radiation sensor | 4 |
|
| Blocking light to solar radiation sensor | 1.0 or less |
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| 1P | — | — | — | — | — |
| 1Q | — | — | — | — | — |
| 1R*1 | Seat warmer switch signal | Seat warmer control unit | Because this terminal is for communication, integrity determination by terminal voltage is not possible. |
|
|
| 1S | MS_CAN_H | CAN related module | Because this terminal is for communication, integrity determination by terminal voltage is not possible. |
|
|
| 1T | — | — | — | — | — |
| 1U | MS_CAN_L | CAN related module | Because this terminal is for communication, integrity determination by terminal voltage is not possible. |
|
|
| 1V | — | — | — | — | — |
| 1W | — | — | — | — | — |
| 1X | — | — | — | — | — |
| 2A | Potentiometer input | Airflow mode actuator | VENT | 4.3 or more |
|
| BI-LEVEL | 3.4 |
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| HEAT | 2.5 |
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| HEAT/DEF | 1.6 |
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| DEFROSTER | 0.7 or less |
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| 2B | Motor operation (COLD) | Driver-side air mix actuator | Moving towards HOT | 1.0 or less |
|
| Moving towards COLD | B+ |
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| 2C | — | — | — | — | — |
| 2D | Motor operation (HOT) | Driver-side air mix actuator | Moving towards HOT | B+ |
|
| Moving towards COLD | 1.0 or less |
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| 2E | Potentiometer input | Passenger-side air mix actuator | Set temperature at MAX HOT | 4.3 or more |
|
| Set temperature at MAX COLD | 1.0 or less |
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| 2F | Motor operation (HOT) | Passenger-side air mix actuator | Moving towards HOT | B+ |
|
| Moving towards COLD | 1.0 or less |
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| 2G | Potentiometer input | Driver-side air mix actuator | Set temperature at MAX HOT | 4.3 or more |
|
| Set temperature at MAX COLD | 1.0 or less |
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| 2H | Motor operation (COLD) | Passenger-side air mix actuator | Moving towards HOT | 1.0 or less |
|
| Moving towards COLD | B+ |
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| 2I | Motor operation (VENT) | Airflow mode actuator | Moving towards VENT | B+ |
|
| Moving towards DEFROSTER | 1.0 or less |
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| 2J | Motor operation (FRESH) | Air intake actuator | Moving towards RECIRCULATE | 1.0 or less |
|
| Moving towards FRESH | B+ |
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| 2K | Motor operation (DEFROSTER) | Airflow mode actuator | Moving towards DEFROSTER | B+ |
|
| Moving towards VENT | 1.0 or less |
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| 2L | Motor operation (RECIRCULATE) | Air intake actuator | Moving towards RECIRCULATE | B+ |
|
| Moving towards FRESH | 1.0 or less |
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