DTC U0231-68: Communication Error With Auto Light Sensor/Humidity Sensor/Rain Sensor: Notes
WARNING: This page is about a different car, the 2018 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.
DTC U0231:68 (Front Body Control Module (FBCM)) DETECTION CONDITION AND POSSIBLE CAUSE
| 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 Function |
Control is continued at the normal value right before malfunction for only the auto light system and auto wiper system. |
| 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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