2008 Volvo truck aux input question

I don't see an AUX port on the front, it is in the back? Those 4 holes on the front are for the clip removal tool if it has to be removed or replaced...

Strike that...I zoomed in too tight on the stereo and didn't notice the plug on the left.

 

Your stereo is slightly different from mine, but mine has a button on front marked CD/Aux. What are the 2 buttons above & nearest the red light below the CD slot? You may also be able to press the "Band" button several times until Aux audio plays, but that's less likely to work.

Can you load a CD into the slot and then select listening to FM radio while the CD stays inside the radio? What button would you press to switch back to listening to the CD. Try pressing that button but while there is no CD inside the radio.