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I now have more information that has provided me with a greater understanding of why the Base Module (N16/1) I recently purchase can not be used for my W124 E420. The BM (N16/1) all look the same, but they have prongs for different applications in the vehicle. The BM (16/1) is used in W124, W129 and W140; however, the BM (16/1) are all design to function specifically for the vehicle body it was design for. BM can not be interchangeable among models.
Here is some information about the BM and the difference in the functions of the wiring. I hope this will be a help to some of the members.
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