If you're planning on disconnecting the wiring harness from an assembly, there are a few things you'll need to keep in mind. First, make sure that you have the correct tools for the job. A screwdriver and a pair of pliers should suffice. Next, locate the wiring harness that you need to disconnect. It's usually located near the assembly itself. Once you've found it, gently pull on it to release it from the clips or other fasteners holding it in place. Finally, disconnect any wires that may be attached to the assembly itself before removing the entire harness.