DTC B11F5-86; B1A69-86; U210A-86: Climate Control Unit (Full-Auto Air Conditioner): Notes
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.
DTC B11F5:86, B1A69:86, U210A:86 (CLIMATE CONTROL UNIT - FULL-AUTO AIR CONDITIONER) DETECTION CONDITION AND POSSIBLE CAUSE
| System malfunction location |
- B11F5:86: Invalid data (humidity sensor temperature) received from humidity sensor
- B1A69:86: Invalid data (relative humidity) received from humidity sensor
- U210A:86: Invalid data (windshield temperature) received from humidity sensor
|
| Detection condition |
- Climate control unit receives the invalid data from the front body control module (FBCM).
|
| Fail-safe function |
B11F5:86
- Humidity sensor input value (temperature) is fixed at -40 °C {-40 °F}.
B1A69:86
- Humidity sensor input value (humidity) is fixed at 100 %.
U210A:86
- Humidity sensor input value (windshield temperature) is fixed at -40 °C {-40 °F}.
|
| Possible cause |
- Malfunction in the wiring harness between the humidity sensor and front body control module (FBCM)
- Malfunction in the wiring harness between the front body control module (FBCM) and instrument cluster
- Malfunction in the wiring harness between the instrument cluster and climate control unit
- Humidity sensor malfunction
- Instrument cluster malfunction
- Front body control module malfunction
- Climate control unit malfunction
|
| System wiring diagram |
Not applicable |