Climate Control Unit Inspection (Auto A/C): Notes
- Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
- Remove the following parts:
- Console side panel (See CONSOLE SIDE PANEL REMOVAL/INSTALLATION .)
- Switch panel (See SWITCH PANEL REMOVAL/INSTALLATION .)
- Cup holder (See CUP HOLDER REMOVAL/INSTALLATION .)
- Selector lever knob (ATX) (See SELECTOR LEVER COMPONENT REMOVAL/INSTALLATION .)
- Shift panel (See SHIFT PANEL REMOVAL/INSTALLATION .)
- Front console box (See FRONT CONSOLE BOX REMOVAL/INSTALLATION .)
- Side wall (See SIDE WALL REMOVAL/INSTALLATION .)
- Rear console (See REAR CONSOLE REMOVAL/INSTALLATION .)
- Driver-side front scuff plate (See FRONT SCUFF PLATE REMOVAL/INSTALLATION .)
- Driver-side front side trim (See FRONT SIDE TRIM REMOVAL/INSTALLATION .)
- Lower decoration panel (See DECORATION PANEL REMOVAL/INSTALLATION .)
- Hood release lever (See HOOD RELEASE LEVER AND RELEASE CABLE REMOVAL/INSTALLATION .)
- Fuel filer lid opener lever (See FUEL-FILLER LID OPENER AND LEVER REMOVAL/INSTALLATION .)
- Driver-side lower panel (See LOWER PANEL REMOVAL/INSTALLATION .)
- Center lower panel (See CENTER LOWER PANEL REMOVAL/INSTALLATION .)
- Remove the climate control unit with the connector connected. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION (AUTO A/C) .)
- Connect the negative battery terminal.
- Switch the ignition ON (engine off or on).
- Connect the negative (-) lead of the tester to body ground.
- 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 1T), replace the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION (AUTO A/C) .)
- For terminal 1T, first try replacing the blower fan controller. (See BLOWER FAN CONTROLLER REMOVAL/INSTALLATION .) If there is still malfunction, replace the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION (AUTO A/C) .)
Terminal Voltage Table (Reference)
- If there is any malfunction, inspect the parts under "Inspection item(s)".
TERMINAL VOLTAGE DESCRIPTION
| Terminal | Signal name | Connected to | Measurement condition | Voltage (V) | Inspection item(s) | ||
|---|---|---|---|---|---|---|---|
| 1A | Passenger compartment temperature sensor input | Passenger compartment temperature sensor | Compared with temperature detected by passenger compartment temperature sensor | Refer to graph 1 |
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| 1B | Potentiometer input | Airflow mode actuator | VENT | 4. 3 |
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| BI-LEVEL | 3. 4 | ||||||
| HEAT | 2. 5 | ||||||
| HEAT/DEF | 1. 6 | ||||||
| DEFROSTER | 0. 7 | ||||||
| 1C | +5V |
|
Under any condition | 5. 0 |
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| 1D | Potentiometer input | Air intake actuator | RECIRCULATE | 1. 0 |
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| FRESH | 3. 9 | ||||||
| 1E | Evaporator temperature sensor input | Evaporator temperature sensor | Compared with temperature detected by evaporator temperature sensor | Refer to graph 2 |
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| 1F | Solar radiation sensor (RH) input | Solar radiation sensor | Sunlight shined directly on solar radiation sensor | 4 |
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| Blocking light to solar radiation sensor | 1. 0 or less | ||||||
| 1G | - | - | - | - | - | ||
| 1H | Solar radiation sensor (LH) input | Solar radiation sensor | Sunlight shined directly on solar radiation sensor | 4 |
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| Blocking light to solar radiation sensor | 1. 0 or less | ||||||
| 1I | GND | Body ground | Under any condition | 1. 0 or less |
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| 1J | Motor operation (HOT) | Driver-side air mix actuator | Moving towards HOT | B+ |
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| Moving towards COLD | 1. 0 or less | ||||||
| 1K | MS_CAN_H | CAN related module | Because this terminal is for communication, integrity determination by terminal voltage is not possible. | ||||
| L | Motor operation (COLD) | Driver-side air mix actuator | Moving towards HOT | 1. 0 or less |
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| Moving towards COLD | B+ | ||||||
| 1M | MS_CAN_L | CAN related module | Because this terminal is for communication, integrity determination by terminal voltage is not possible. | ||||
| 1N | IG2 | Front body control module (FBCM) | Switch the ignition ON (engine off or on) | B+ |
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| Switch the ignition off | 1. 0 or less | ||||||
| 1O | - | - | - | - | - | ||
| 1P | - | - | - | - | - | ||
| 1Q | Sensor GND |
|
Under any condition | 1. 0 or less |
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| 1R | - | - | - | - | - | ||
| 1S | - | - | - | - | - | ||
| 1T | Blower fan speed control | Blower fan controller | (See BLOWER FAN SPEED CONTROL SIGNAL ) |
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| 1U | B+ | ROOM 15 A fuse | Under any condition | B+ |
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| 1V | - | - | - | - | - | ||
| 1W | IG1 | C/U IG1 15 A fuse | Switch the ignition ON (engine off or on) | B+ |
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| Switch the ignition off | 1. 0 or less | ||||||
| 1X(1) | Front seat warmer switch signal | Front seat warmer control unit | Because this terminal is for communication, determination using terminal voltage inspection is not possible | ||||
| Seat ventilation switch signal | |||||||
| 2A | Motor operation (HOT) | Passenger-side air mix actuator | Moving towards HOT | B+ |
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| Moving towards COLD | 1. 0 or less | ||||||
| 2B | Motor operation (DEFROSTER) | Airflow mode actuator | Moving towards DEFROSTER | B+ |
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| Moving towards VENT | 1. 0 or less | ||||||
| 2C | Motor operation (COLD) | Passenger-side air mix actuator | Moving towards HOT | 1. 0 or less |
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| Moving towards COLD | B+ | ||||||
| 2D | Motor operation (VENT) | Airflow mode actuator | Moving towards VENT | B+ |
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| Moving towards DEFROSTER | 1. 0 or less | ||||||
| 2E | - | - | - | - | - | ||
| 2F | Motor operation (RECIRCULATE) | Air intake actuator | Moving towards RECIRCULATE | B+ |
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| Moving towards FRESH | 1. 0 or less | ||||||
| 2G | - | - | - | - | - | ||
| 2H | Motor operation (FRESH) | Air intake actuator | Moving towards RECIRCULATE | 1. 0 or less |
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| Moving towards FRESH | B+ | ||||||
| 2I | Potentiometer input | Passenger-side air mix actuator | Set temperature at MAX HOT | 4. 3 |
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| Set temperature at MAX COLD | 0. 7 | ||||||
| 2J | - | - | - | - | - | ||
| 2K | Potentiometer input | Driver-side air mix actuator | Set temperature at MAX HOT | 4. 3 |
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| Set temperature at MAX COLD | 0. 7 | ||||||
| 2L | - | - | - | - | - | ||
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