BYD F3/F3R Owner's Manual page 23

When the speeds reach to 20km/h, all doors
will be locked automatically.
When you turn the ignition key from "ON" to
"ACC" or "LOCK", all doors will be opened.
You can cancel these functions. For details,
see the section "Settings of optional
functions".
Rear door child protector
Move the lock lever to the "LOCK" position as
shown in the figure.
When the child-protector is locked, you can
not open the rear door via the inside door
handle. We recommend using this feature
when ever small child are in the vehicle.
.
F3/F3R OWNER'S MANUAL
CAUTION
Before driving, be sure that the doors
are closed and locked, especially
when small children are in the
vehicle. Along with proper use of seat
belts, locking the doors helps
prevent the driver and passengers
from being thrown out from the
vehicle in an accident. It also helps
prevent the doors from being opened
unintentionally.
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