Lexus 2013 IS250C Owner's Manual page 504

5-2. Steps to take in an emergency
Message
(Flashing)
504
Details
Indicates that the trunk is
not fully closed.
flashes and a
buzzer sounds to indi-
cate that trunk is not fully
closed (with the vehicle
having reached a speed
of 3 mph [5 km/h]).
The vehicle was driven
with the retractable hard-
top partially open.
When the vehicle speed
exceeds 1.6 mph
(3 km/h),
and a buzzer will sound.
The "ENGINE START
STOP" switch was turned
off while the retractable
hardtop was partially
open.
Correction procedure
Close the trunk.
Stop the vehicle in a safe
place and open or close
the retractable hardtop
completely. (P. 86)
flashes
Open or close the retract-
able hardtop completely.
(P. 86)