What causes the AUTO light on the 14th-generation Sylphy to keep flashing?

[ArthurLynn]

The most likely reason for the AUTO light on the 14th-generation Sylphy to keep flashing is a circuit fault. Below are the related causes and solutions: 1. Circuit fault: The sensor or circuit of the auto start-stop system malfunctions. When the auto start-stop indicator light comes on, it may be due to a fault in the internal components of the auto start-stop system, causing the AUTO indicator light to illuminate. Solution: Visit a repair shop or 4S store for diagnosis and repair. 2. Sensor error: The seat belt sensor gives a false alarm, possibly due to a malfunction in the seat belt sensing mechanism, leading to the false assumption that the seat belt is not fastened and preventing the start-stop device from functioning properly. Solution: Fasten the seat belt again. 3. Low battery charge: If the battery charge is too low or the battery is depleted, the control system will determine that the battery voltage or charge is insufficient and disable the start-stop system. Solution: Fully recharge the battery or replace it.

[MacJaxon]

I've repaired many Nissan Sylphy models, and the flashing AUTO light is often caused by sensor failure or computer module malfunction. When the sensor receives abnormal light signals, it keeps sending commands, causing the light to flash continuously; internal short circuits or contact oxidation in the headlight control module can also interrupt signal transmission. Voltage instability can also cause issues, such as excessive alternator output or battery aging. During diagnosis, start with the basics: clean the sensor surface, turn off the ignition and wait for the system to reset before restarting, then observe if the light behavior changes. If the issue persists, use a diagnostic tool to read the fault codes and determine whether the sensor is faulty or if there's a wiring problem. It's recommended to avoid driving on dusty roads to extend the lifespan, and address any issues promptly to prevent affecting nighttime driving safety.