OWNER ANSWER
BYD SEAL driver-assistance alerts: owner guidance
If lane assistance or an alert behaves unexpectedly on your original SEAL, identify the named feature, then check visibility and road markings. Park before reviewing its settings; a lane warning, steering correction, speed-sign alert and cruise response need different checks.
- Keep control and move to a safe place before using the settings.
- Read the exact feature name and any warning.
- Demist and gently clean the windscreen camera’s view. Safety note: Deliberately drifting or recreating a harsh intervention risks losing control. Take over normally and make these checks while parked; use professional assessment for unsafe steering or braking.
- Check whether the event occurred with worn or temporary markings, roadworks, glare, shadows, spray or snow.
- Review the relevant assistance setting for your actual software while parked.
- Check cold tyre pressures and any tyre or sensor warning before an ordinary journey.
What to expect
The camera view is clear and you have identified the actual assistance setting and conditions involved. An obstruction indication may clear; repeated unexpected steering or braking in clear conditions still needs professional assessment.
If that did not work
For repeated unexpected steering/braking or a persistent fault in clear conditions, ask BYD to inspect sensor alignment, fault history and applicable software. If control is unsafe, stop and use assistance.
What to note down for support: Note which function intervened, time/place, markings/weather and full software. A saved dashcam clip can help; there is no need to drive a test route.
What the pattern tells you
Unclear markings or an obstructed view can limit recognition. A new problem after glass, alignment or collision work needs a calibration and geometry check. Software can change menus and remembered preferences; a muted alert does not tell you whether the feature is active.
Speed signs and normal observation
Use the actual road signs and driving conditions rather than treating recognised signs as the legal limit. Mirrors and direct observation remain necessary even when the camera display looks clear.
Related links
Source: byd.com: owners manual (BYD UK) · SEAL handbook (PDF 121) (BYD UK). Checked 22 October 2026.