BYD ATTO 3 high beam switches unexpectedly: check HMA

China-market owner report

In a discussion dated 2024-08-07, the linked China-market report raised this issue: Within a 2022 Yuan Plus ownership report, the owner described automatic high beam occasionally provoking oncoming drivers and reduced winter range. This is an individual account, not a confirmed diagnosis or failure-rate finding. The steps below use the export handbook.

Checks to make while safely parked

1. 1Identify the functionCheck whether HMA is enabled and whether the light switch is in AUTO. The handbook requires both, plus operating conditions, for automatic high/low-beam changes.
2. 2Check the camera’s viewInspect the windscreen area used by the camera for dirt, mist or blocking stickers. Clean the glass normally; do not move or recalibrate the sensor yourself.
3. 3Choose manual control if necessaryDisable HMA through Driving Assist while stopped. Use low beam and the stalk as road conditions require rather than waiting for an automatic correction.
4. 4Record recurring behaviourNote speed, weather, nearby reflective signs and the HMA indication. A passenger can record observations; do not film or operate settings while driving.

Tick steps as you go. Your progress stays in this tab.

Check the result and know when to stop

The manual lists poor weather, reflections and inadequately lit road users among limitations. Those limits do not excuse dazzling another driver. Persistent unexpected operation, especially after windscreen work or an impact, should be checked by BYD; the owner story does not establish a general defect.

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