DTC U0231-68: Communication Error With Auto Light Sensor/Humidity Sensor/Rain Sensor (FBCM): 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.
| Description |
Communication error with auto light sensor/humidity sensor/rain sensor |
| Detection condition |
- Front body control module (FBCM) could not receive the signals from the auto light sensor/humidity sensor/rain sensor for 5 s or more with the ignition switched ON (engine off or on).
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| Fail-safe |
Not applicable |
| Possible cause |
- Auto light sensor/humidity sensor/rain sensor connector or terminal malfunction
- Front body control module (FBCM) connector or terminal malfunction
- Short to ground in wiring harness between auto light sensor/humidity sensor/rain sensor terminal C and front body control module (FBCM) terminal 2G
- Short to power supply in wiring harness between auto light sensor/humidity sensor/rain sensor terminal C and front body control module (FBCM) terminal 2G
- Open circuit in wiring harness between auto light sensor/humidity sensor/rain sensor terminal C and front body control module (FBCM) terminal 2G
- Auto light sensor/humidity sensor/rain sensor malfunction
- Front body control module (FBCM) malfunction
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 Courtesy of MAZDA MOTORS CORP.
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