DTC B1A69-86: Error Signal Received From Auto Light Sensor/Rain Sensor (BCM): Notes

WARNING: This page is about a different car, the 2020 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.

DTC B1A69:86 (BCM) DETECTION CONDITION AND POSSIBLE CAUSE

Description	Error signal received from auto light sensor/rain sensor
Detection condition	BCM receives the error signals from the auto light sensor/humidity sensor/rain sensor for 5 s or more with the ignition switched ON (engine off or on).
Fail-safe	Not applicable
Possible cause	Auto light sensor/rain sensor malfunction BCM malfunction
System wiring diagram	Not applicable