OWNER ANSWER
Why does my original BYD SEAL rear-view mirror look dark at night?
If your original SEAL has the automatic anti-glare rear-view mirror, it darkens in response to the surrounding light to reduce glare from behind. Start by adjusting the mirror while parked so it frames the rear window. BYD’s handbook describes automatic dimming and does not list an owner switch to turn it off.
- While parked, adjust the interior mirror up, down or sideways until you can see through the rear window. Stop if the mirror resists adjustment.
- Check whether the glass or anything in the rear window is restricting the view. Note whether the mirror is also unusually dark in daylight.
- In normal use, notice whether the mirror darkens when there is glare from behind and whether the view improves when the glare passes. Record the conditions only after parking.
What success looks like
You have a clear view through the rear window in ordinary light, and the mirror reduces glare when bright lights are behind you.
If that did not work
If the mirror stays dark in daylight, darkens unevenly or makes the rear view hard to use, ask BYD to check the interior mirror and its automatic dimming response. Tell them whether the issue also happens in daylight and whether the rear glass is clear. One SEAL owner reported that dimming made their night-time view harder to use. Their report does not establish a fault or a setting that applies to other cars.
Safety note: Adjust the mirror before setting off. If you cannot get the view you need, stop safely and arrange a check.
Useful next steps
BYD original SEAL RHD EN-250305, printed p. 69. Checked 13 November 2026. Match your own handbook if your mirror or model year differs.
Open source (BYD UK)