Fault Codes – Any insight appreciated

[Attacking Mid]

Where is this "dealer splice"? Is it visible simply by removing the rear compartment cover, or is it down below the plastic tray, or behind the fuse box? Was just hoping for some clarification to help me find the potential issue.

I, too, am chasing a bunch of persistent K-CAN errors. They don't seem to cause any noticeable symptoms, other than I'm hoping it will solve my occasional Comfort Access glitches.

Appreciate anyone who can clarify where to look for this "splice".

AM.

[Attacking Mid]

Well, I figured it out. The K-CAN bus wires (in my case - 4) are spliced (soldered) together under the factory wire wrap as part of the main wiring loom at the bottom of the right rear cavity directly below the rear fuse box.

The K-CAN bus uses two wires - one green, the other green/orange. For some reason, my green wires were totally corroded, but my green/orange wires seemed fine. I still re-soldered the green/orange for good measure.

Afterward, I hooked up ISTA, cleared the codes, and this was the glorious sight upon re-running the vehicle test. Yay!!!!



I found a reference to connectors X15005 and X15006, so I searched for those and found this clue:



Seemed like a longshot, but I went ahead and unwound all the tape on the main harness. Lo and behold.... I found this suspicious situation notice the loose green wires:



A closer shot:



Here's the "connector" cut open to reveal all the corrosion. It's not really a connector, it's just a plastic tube to cover up the soldered wire ends:



Here's the green wires re-soldered and the green/orange before being re-soldered and able to re-use the plastic tube. I used a new piece of generic tubing over the green wires. I would have shrink wrapped, but I got tired of hunting for shrink wrap tubing in my garage. It'll show up next time I'm out there



Here's what the good green/orange wires looked like after removing the plastic tubing. Seemed perfect, though I re-soldered to be sure:



Hope this helps someone else out there with persistent K-CAN line errors. These do not throw a CE light, but they show up anytime you run a scan with ISTA or other software. Though all the systems functioned, I did get some weird random flakiness from my Comfort Access system and a few other weird, but very sporadic problems. I'll report back in a few weeks to say if it seems those issues are gone.

AM.

[Purplecty]

I was helping a friend with similar CAN errors on his 08 E70 4.8 and this was indeed the issue/fix for those CAN errors. What great information! Priceless!

[Attacking Mid]

Nice! Glad it was of help!

AM.

[ard]

Looks like the ends of those splices were marinating in a water bath for a few years...finally failed due to the corrosion.




Off Topic... My in-the-ground dog fence failed after many years....seems gophers will come along and chomp into the insulation, but when they hit the copper wire it is YUCK!...they dont eat it or chew on the copper. BUT, the hole in the insulation allowed water to get in, and every spot failed with a green mass of mushy copper... as a result I had open wires every 20, 30 feet. Over 2500 ft of wire. Just replaced it.

[Bananafone]

Does anyone have the wiring diagram showing those four green wires are indeed spliced together? My ‘13 e70 they are completely free with no copper showing almost like they were snipped. I get KCAN issues /Christmas tree only when it rains.

[ard]

I looked, cannot find anything specific.


Just clean it up, strip some clean wire and wire-nut them...see if that fixes it.

[Bananafone]

I did just as you suggested this morning
So far no codes, will see what the next torrential rain storm brings