Possible cause
WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Climate control unit power supply voltage or body ground malfunction
- Open circuit in wiring harness between climate control unit and connector C-33
- Connector C-33 malfunction
- Climate control unit malfunction