Blower Fan Controller Inspection (Auto A/C)
WARNING: This page is about a different car, the 2014 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
- 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 blower fan controller 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 blower fan controller.
- If there is any malfunction, inspect the parts under "Inspection item(s)".
TERMINAL VOLTAGE REFERENCE CHART
| Terminal | Signal name | Connected to | Measurement condition | Voltage (V) | Inspection item(s) |
|---|---|---|---|---|---|
| A | Motor operation (-) | Blower motor | Switch the ignition off | 1.0 or less |
|
| Fan stopped (Switch the ignition ON (engine off or on)) | B+ | ||||
| Fan: manual 1st | 8.4 | ||||
| Fan: manual 3rd | 5.1 | ||||
| Fan: manual 7th | 1.0 or less | ||||
| B | Blower fan speed control | Climate control unit | Switch the ignition off | 1.0 or less |
|
| Fan stopped (Switch the ignition ON (engine off or on)) | 2.5 | ||||
| Fan: manual 1st | 3.7 | ||||
| Fan: manual 3rd | 6.9 | ||||
| Fan: manual 7th | B+ | ||||
| C | GND | Body ground | Under any condition | 1.0 or less |
|
| D | - | - | - | - | - |
| E | Motor operation (+) | Blower motor | Switch the ignition off | 1.0 or less |
|
| Switch the ignition ON (engine off or on) | B+ | ||||
| F | B+ | Blower relay | Switch the ignition off | 1.0 or less |
|
| Switch the ignition ON (engine off or on) | B+ |