Enable rear seatbelt buckle warning/notification lights

I have a 2018 cx9 sport that I bought used recently and I don't have a manual (dealer didn't have one in the car)

Does anyone know how I can enable the rear seat seatbelt notification lights. My passenger side seems to come on but the rear doesn't.

I tried to look online but can't find any answers.
Please help.
 

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The CX-9 doesn't have rear seatbelt notification, as far as I'm aware.
 
That's so weird. You can faintly see the seatbelt icons in the picture on the left portion.

That's what made me wonder if those were functional or not.
 
Only speaking for my 2019GT. They illuminate red if not buckled, then green when buckled, then go out after 30 seconds or so. All three rows.
 
I think it's offered at other markets. You can refer to the picture in the first post.

 
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