Dealership is still looking at my X5 trying to root cause the KCAN faults. I chose to take the car to the dealership instead of an indy because the FRM module was replaced under warranty in Feb so I was hoping that maybe the tech screwed up on the install or maybe that there was some wiring harness fault covered under warranty or something.

So far no luck. The foreman has been investigating various suspect areas (supposedly per BMW engineering's recommendation) and hasn't found anything yet. He checked under the rear fuse box, but didn't find anything odd. He's also been checking each of the relevant KCAN modules and no issues found with the modules yet.

Last update I got was that the foreman had removed one of the seats and was checking the wiring underneath, but found nothing that looked wrong.

These KCAN faults (persistent faults are D904, E5C4, D2C4, DE84) have been around for a while and seemed to be benign, but only in recent months did they start causing odd behaviors like christmas light dash and turn signals/dome lights not working. But it's intermittent and the next day the car will be fine.

Was hoping replacing the FRM was the root cause as symptoms pointed to FRM failure, but clearly it wasn't (although it was deemed the FRM had gone bad so good it was replaced under warranty). I've been forwarding any info I can find online regarding E70 KCAN faults to the dealership.

Very annoying.