Here’s How a $40 Part Ruined this Once $90,000 BMW X6M’s Entire Electrical System

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I found what was causing all the electrical issues in my cheap auction Lemon Buyback Twin Turbo Repo (No Joke It really has all those things going for it) BMW X6m. But as we fix one issue quite a few crop up….

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49 thoughts on “Here’s How a $40 Part Ruined this Once $90,000 BMW X6M’s Entire Electrical System

  1. Hey guys. The new batteries… if you jump start them from battery terminal and connect positive first you can fry the electric boards. I blew a FEM module and car would not start. Be careful when using power packs to start.

  2. I had this on a Skoda, only solved by cutting the drains end on the door shuts and then blasting the windshield wiper scuttle area with a jet wash and consistently hoovering up water and eventually everything emptied and it all dried out over the next month.

  3. Think the advice you where given was to technical maybe to encourage using the expert haha I would have done exactly what you did follow the codes well done sam love it when a difficult problem is sorted
    John

  4. Hey Sam. Your videos are so much interesting to watch. As an ECU designer from Bosch, this takes me back to my field failure investigation sessions. About the seat control module that went bad due to water intrusion, you may be able to revive it. Try to warm the circuit board with a hair drier and then clean up the board using some isopropyl alcohol. Dry again and put it back. If the seat control functions were working fine from the beginning, it means that the module wasn't fully affected by water. Waiting for your next video on this BMW.

  5. This is the problem with CANBUS. It's great when it's all working properly but it doesn't take much for a faulty module to corrupt the CANBUS data bus and make other modules data become garbled. It's fine if a module fails completely but a module that's not entirely dead, like this seat module, will cause a massive headache.
    You can see why even a dealer wouldn't bother with it due to the time, and hence money, it would take for a technician to troubleshoot all the modules in the vehicle.

  6. You need a length of BOWDEN Cable outer cover (the outer tube that goes round pedal bike brake cables) to rod that blockage out on the sunroof drain and rod it out from below back up over so from behind the wheel arch liner fender area

  7. I can't believe BMW techs couldn't figure this out themselves? They must be literally hiring chimps from the local zoo. Reminds me of a footwell leak I once had in a Renault. Car had super weird electrical gremlins, like the indicators randomly flashing while the car was parked and not running. Took up the carpet and there was like a half-inch of water with cables and connectors lying in it. Turned out blocked windscreen scuttle drains were allowing water to pool and leak into the cabin.

  8. One way to clear it is to find out where the drainage pipe comes out, then using a long peice of wire about 2/3rd of the diameter of the pipe, with an angle cut on the end, pass it up pipe until you get to the obtruction. Then push and twist the wire, should clear the blockage, almost certainly just a build up of gunk. Don't be tempted to push from the top, this could just impact the blockage even more. Good luck and great spot.

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