OWNER ANSWER
Why did my BYD DOLPHIN flash its hazards when a car approached from behind?
If your DOLPHIN has Rear Collision Warning, it can switch on the hazard lights when it detects a vehicle closing quickly in your lane. Once parked, check whether Rear Collision Warning is fitted and enabled in the driver-assistance settings. The flash alone cannot tell you which system triggered it.
- When parked, look for Rear Collision Warning (RCW) in the ADAS settings. BYD groups it with Blind Spot Assist. Menu wording can differ by software version.
- Think back to what happened. If a vehicle was closing quickly from behind in your lane and the hazards flashed briefly, that matches the behaviour BYD describes. Note any warning message if you see it again.
- If the alerts recur without a vehicle behind, look for dirt or snow on the rear bumper corners. BYD identifies those areas as the rear radar locations.
What success looks like
A brief automatic flash in the described situation is consistent with Rear Collision Warning. A persistent fault message or repeated flashes without a matching situation need a separate check.
If that did not work
If the flashes keep happening without a vehicle closing from behind, tell BYD the road conditions, where the other vehicle was, and any cluster message. Ask them to check the rear corner radars and the warning event. If the hazards stay on, pull over safely before checking the hazard control or arranging help.
Keep driving normally and never recreate a close approach to test the warning.
Useful next steps
- Read BYD’s DOLPHIN Rear Collision Warning description (BYD UK)
- Check the rear radar and driver-assistance guidance (BYD UK)
- Check a DOLPHIN forward-collision or AEB warning
BYD DOLPHIN RHD EN-250515, Rear Collision Warning and Blind Spot Assist. Checked 13 November 2026.
Open source (BYD UK)