Mazda 3 no sound from stereo

[Sammyp123]

Good evening all,

Recently bought A 2016 Mazda 3 . It’s has nav and a Bose system. However, for some reason everything works , but no sounds come through the speakers.

Has anyone any ideas. I’ve pulled the stereo out to look Behind it and there is connector into which a plug would fit but no plug. However, I have tried searching on line and cannot seem to find and pictures of a similar stereo with all the wires in to compare if one is supposed to be there.

Any help or guidance appreciated.

Thanks