First the 25 pin connector is for the cell phone. The round connectors are correct. You got two cables one has a female connector on it, you unplug the one male round din connector on the tuner module (rt side in the trunk) and plug it into the female connector then plug the othe cable that you got into the hole which you unplugged the other one from (in the tuner module) Then you have the two cables ready to plug inthe the silverstone 980. The power / 4 pin cable on the tuner module gets unplugged and plugs into the like female jumper and the other side plugs back into the tuner power port. If it is a black box that would be the amplifier and the tuner box is silver and also is a 1432 model # on it.

Scott

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The Mercedes Specialists Since 1986