Right guys, about to change the audio of my 6n2 on the front passenger side and the old speaker isn't working, let alone putting in a new speaker. So does anyone know what the problem is considering the back passenger side speaker is working? 

Edited 10 August, 201610 yr by melchapman

Most problems with anything electrical that's door mounted, is the wiring in the flexy rubber tube between the door and the body, the wires snap/fray with the opening/closing of the door, so pull the rubber back and have a good look for any that are broken/shorted (touching each other)