I've been researching a way to plug in an aux cord but I need to buy the $20 plug and look for the white empty plug under the door sill on the passenger side. Didn't see it anywhere. I have a 2004 clk320 that has the BOSS audio system. So does anybody know anyother way of getting one or if I'm looking at the wrong area? I'm tired of listening to the same stuff on the radio lol

On my right hand drive car, my connector was on the passenger, LH of the car. I do not know if this is reversed in left hand drive vehicles. I did write a thread, where I wired into the connector rather than purchase the connector from the dealer. Just wired an aux cable and routed it to the centre armrest. Much more useful there than in the glovebox, and is also easy to route.

Mine is in the glove box. Left hand drive so it is in the box on the passenger side )r side) on the right side of the box

No where to be found 😔

MY2004 won't have an AUX input, and no way to add one without replacing or modifying the head unit.