Blower Fan Controller Inspection: Notes
WARNING: This page is about a different car, the 2021 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
- Remove the following parts:
- Glove compartment (See GLOVE COMPARTMENT REMOVAL/INSTALLATION .)
- Dashboard under cover (See DASHBOARD UNDER COVER REMOVAL/INSTALLATION .)
- Remove the blower fan controller. (See BLOWER FAN CONTROLLER REMOVAL/INSTALLATION .)
- Connect the blower fan controller connector.
- Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
- 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. (See BLOWER FAN CONTROLLER REMOVAL/INSTALLATION .)
- If there is any malfunction, inspect the parts under "Inspection item (s)".
Terminal Voltage Table (Reference) (Full-auto Air Conditioner)
TERMINAL VOLTAGE SPECIFICATION
| 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 | 6.1 | ||||
| Fan: manual 7th | 1.0 or less | ||||
| B | Blower fan speed control | Climate control unit | (See Blower Fan Speed Control Signal .) |
|
|
| 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+ | ||||
Terminal Voltage Table (Reference) (Manual Air Conditioner)
| 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 | 8.3 | ||||
| Fan: manual 3rd | 5.7 | |
|||
| Fan: manual 7th | 1.0 or less | ||||
| B | Blower fan speed control | Climate control unit | (See Blower Fan Speed Control Signal .) |
|
|
| 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+ | ||||