https://www.ecstuning.com/b-genuine-...4g0035503kgru/

It's just a FAKRA plug and RF cable. One to the radio (sat radio R170), two to the J794 (GPS R50 and cellular R65). No idea which color goes to which. It looks like there's pigtail leads that attach to the R52 roof aerial and then a join to the longer wire running to the front or rear. Kind of looks like the join for the video cable from the parking camera to its cable.

Here's an idea of what you're looking at. https://www.ebay.com/i/392064375069
But if it is the main cable run that has a problem end, yeah, probably better to redo the end. And for that, you would need a FAKRA crip tool.