“Grease monkey”
When you assume, you just make more of an ass out of yourself. Amazing how someone who doesn’t understand basic electrical now has an “engineering background”
Regardless of your claimed “background”, you clearly have zero knowledge or experience in Automotive, especially electrical/electronics/multiplexing. That much is obvious by your advocation for an aftermarket device that connects to the DLC, which are widely known across the service industry to cause damaged pins and network communication issues.