This warning light illuminates when the tailgate is not closed securely.
Kia Cee'd JD Owners Manual: Self-diagnosis
When you shift the gear to the R
(Reverse) position and if one or more of
the below occurs you may have a malfunction
in the parking assist system.
You don't hear an audible warning
sound or if the buzzer sounds intermittently.
is displayed.
If this occurs, we recommend that the
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Kia Cee'd JD Service Manual: Rear Door Module Components and components location
Component Location
1. Rear door module
...