( N16 - 2002 1.6 LX ) The rear speaker does not work

Hello, I'm new here.

I've one issue with my 2002 NISSAN PULSAR 1.6 LX SEDAN.
My rear speaker does not produce any sound.
I have checked with my camera and confirmed that it wasn't a fake.
I have an aftermarket SONY head unit (I can't confirm whether or not it work before the installation).
So I am wondering, are there even rear speakers? If there is, is there any way that I could get it rockin' again?
Please suggest ways to fix this or why this might happen.

Thank you.
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