Climate Control Unit Inspection (Manual A/C): Notes
WARNING: This page is about a different car, the 2016 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.
- Remove the climate control unit with the connector connected. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION (MANUAL A/C) .)
- Switch the ignition ON (engine off or on).
- Connect the negative (-) lead of the tester to the body ground.
- By inserting the positive (+) lead of the tester into the climate control unit connector, 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 Q), replace the climate control unit.
- For terminal Q, first try replacing the blower fan controller. If there is still any malfunction, replace the climate control unit.
- If there is any malfunction, inspect the parts under "Inspection item (s)".
TERMINAL VOLTAGE SPECIFICATION (REFERENCE)
| Terminal | Signal name | Connected to | Measurement condition | Voltage (V) | Inspection item(s) |
|---|---|---|---|---|---|
| A | - | - | - | - | - |
| B | MS_CAN_L | CAN related module | Because this terminal is for communication, good/no good judgment by terminal voltage is not possible. |
|
|
| C | Ground | Body ground | Under any condition | 1.0 or less |
|
| D | MS_CAN_H | CAN related module | Because this terminal is for communication, good/no good judgment by terminal voltage is not possible. |
|
|
| E | Sensor GND |
|
Under any condition | 1.0 or less |
|
| F | - | - | - | - | - |
| G | Potentiometer input | Air mix actuator | Set temperature at MAX HOT | 4.3 or more |
|
| Set temperature at MAX COLD | 1.0 or less | ||||
| H | +5V |
|
Under any condition | 5 |
|
| I | Potentiometer input | Airflow mode actuator | VENT | 4.3 or more |
|
| BI-LEVEL | 3.4 | ||||
| HEAT | 2.5 | ||||
| HEAT/DEF | 0.72 or less | ||||
| J | Evaporator temperature sensor input | Evaporator temperature sensor | Compared with temperature detected by evaporator temperature sensor | Refer to graph 1 |
|
| K | - | - | - | - | - |
| L | B+ | ROOM 15 A fuse | Under any condition | B+ |
|
| M | - | - | - | - | - |
| N | IG2 | Front body control module (FBCM) | Switch the ignition to ON (engine off or on) | B+ |
|
| Switch the ignition off | 1.0 or less | ||||
| O | - | - | - | - | - |
| P | - | - | - | - | - |
| Q | Blower fan speed control | Blower fan controller | (See BLOWER FAN SPEED CONTROL SIGNAL ) |
|
|
| R | - | - | - | - | - |
| S | Motor operation | Air intake actuator | Moving towards RECIRCULATE | B+ |
|
| Moving towards FRESH | 1.0 or less | ||||
| T | Motor operation (VENT) | Airflow mode actuator | Moving towards VENT | B+ |
|
| Moving towards DEFROSTER | 1.0 or less | ||||
| U | Motor operation | Air intake actuator | Moving towards RECIRCULATE | 1.0 or less |
|
| Moving towards FRESH | B+ | ||||
| V | Motor operation (DEFROSTER) | Airflow mode actuator | Moving towards DEFROSTER | B+ |
|
| Moving towards VEVNT | 1.0 or less | ||||
| W | Motor operation (COLD) | Air mix actuator | Moving towards HOT | 1.0 or less |
|
| Moving towards COLD | B+ | ||||
| X | Motor operation (HOT) | Air mix actuator | Moving towards HOT | B+ |
|
| Moving towards COLD | 1.0 or less | ||||