No Sound From Passanger Side Focus

[deanb 0]

Hi, am unsure if im on the right thing but ive got a mk 2 focus 55 plate I put a after market cd player in earlier today but noticed theres no sound what so ever from the passenger side drivers side is all ok, just nothing from passenger, ive checked wires connections everythin if anyone has any ideas itll be a big help, cheers !