OWNER ANSWER
BYD child-presence detection: alerts, settings and safe checks
On an original SEAL running the matching 2.3.0 release, Child Presence Detection can remember an OFF choice for the next start. The older SEAL handbook instead describes returning to ON at startup, so check your installed release before assuming the setting will stay saved.
- Check the exact model, generation and full software version.
- For the original SEAL handbook, open Vehicle → Cabin Perception to find CPD. Safety note: Check the whole cabin yourself before leaving. CPD can miss an occupant and climate control may stop, so never leave a child, vulnerable person or animal in the car to test or rely on it.
- Read the options actually offered and any startup reminder.
- For an unexplained alert, check the empty cabin and remove ordinary loose items before one normal locking comparison.
What changed in original-SEAL 2.3.0?
The reviewed release adds CPD setting memory, including retention of OFF at the next start. It also changes the initial locked-car alert delay from 10 to 90 seconds and adds a brief startup reminder when disabled. This is the matching original-SEAL release, not a shared instruction for every model or the 2026 SEAL.
Older handbook and other models
The EN-250305 SEAL handbook offers OFF, ON, Standard and Delay under Cabin Perception; its Delay extends the alert by five minutes for that trip. For another model or build, use its actual CPD controls and release description.
Rear door opens outside but not inside?
That is a separate child-lock question. On the original SEAL, match the fitted mechanical rear-door-edge latch to the handbook’s OFF arrow, or use the corresponding left/right electric child-lock switch on the driver’s door. Its indicator shows the selected side enabled. Check inside opening with an adult while parked and restore appropriate child protection before carrying children. A door that opens from neither side needs a latch/locking check.
If that did not work
For repeated empty-cabin alerts, ask BYD to check the named CPD trigger and software for your exact car. For a rear door that will not open from either side, give the affected side and inside/outside results so the repairer checks the lock and latch rather than changing CPD.
What to note down for support: For a false alert, model/build, message, empty-cabin conditions and any recent update are useful; for a door fault, give the side and lock-indicator state.
Related links
Source: byd.com: owners manual (BYD UK) · SEAL handbook (PDF 59–60, 147–148; printed 58–59) (BYD UK) · SEAL owner question · BYD Europe Service: original SEAL 2.3.0 release · BYD Austria 2.3.0 bulletin (PDF 7). Checked 22 October 2026.