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9. Because of the module's universal compatibility and different pin-assignments used by Mercedes Benz, all modules are shipped with just the blank pins on the ends of the wiring harness, along with the needed plastic caps. Insert the pins on the module wire harness into the supplied plastic caps according to your car model. The positions on the plastic caps are clearly marked with "1" and "2". The long thin pins go into the bigger one of the two caps. Top half (SLK, CLK) RED wires go in position 1, BLACK wires go in position 2. Bottom half (SL) BLACK wires go in position 1, RED wires go in position 2. Push the pins into the correct position hole in the cap, making sure it locks into place with an audible "click". After inserting all pins, push the plastic latch on the side of the plastic caps in. It also locks into place with an audible "click". Now the plugs are ready for the next step.