Hi JACUSTOMER-q8y69htf , Thank you for using JustAnswer.
I need a little info.
What year is your Rio?
Are you talking about the high mounted light or the regular lights?
Here you go.
Its behind the trim inside trunk (see 2-5 )
It is still called a trunk the panels are like the one in photo This is right side
This photo is interior panels (both 4 and 5 door)
If that does not help. When i get to work i will go out on the lot and get a Rio and
Find the answer. Then try and get back to you by 3:00 PM ok.