When the Engine Start/Stop button is in the ACC or ON position, if any door is open, the system checks for the smart key. If the smart key is not in the vehicle, the indicator will blink, and if all doors are closed, the chime will also sound for about 5 seconds. The indicator will go off while the vehicle is moving. Keep the smart key in the vehicle.
Hyundai Tucson (LM) 2010-2015 Service Manual: DBC Switch Repair procedures
Inspection
1.
Turn ignition switch OFF and disconnect the negative (-) battery cable.
2.
Remove the crash pad side switch assembly.
(Refer to Body - "Crash Pad")
3.
Check the continuity between the switch terminals as the DBC switch is engaged. ...
Hyundai Tucson (NX4) 2022-2023 Owner's Manual: Rear Occupant Alert Precautions
Make sure that all the windows are
closed. If any window is open, the
alert may occur when the sensor has
detected any movement (e.g. wind or
bugs).
The alert may occur if any movement
is detected in the driver's or
passenger's seat.
If all doors are locked with a
passeng ...