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Are there any diodes in the Toy-10 T-Harness (Toy-2 and TY-20)?

Are there any diodes inside the harness that could go bad? I am still working on an issue with my 2019 Tundra and just found out that some harnesses have diodes or resistors in them. I just want to be able to test the harness if the new unit I get still fails to connect to the CAN-BUS. The TOY-10 consists of 2 harnesses. TOY-2 and TY-20.

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