BMW Can bus wire repairs

[Bryan L]

Customer smashed wires in pipe clamp.
Left control switch had obvious heat color change to its internal board . The blue turned dark greenish.

After repair all ECU / ABS / TFT faults were able to be cleared.

All functions returned to the new switch gear .

 

[Bryan L]

What it looked like when I found it.
Customer added bar risers himself.
Also put dot 4 in the clutch master.

Both master and slave were replaced.


@GSer This is the bike I spoke about at yesterdays BMW breakfast.

 

[LaserDave]

Nice Bell splice.

 

[dukey33]

Glad you added the second post. I could not figure out how a pipe clamp should ever be near a beemer.
Nice job on the fix.

 

[GSer]

Great job! I am glad the Canbus didn’t give you any trouble after you spliced the wire.
I had no idea that some brake fluid in the clutch master cylinder could cause so many problems. This is good lesson for many people, including me.

 

[Bryan L]

Glad you added the second post. I could not figure out how a pipe clamp should ever be near a beemer.
Nice job on the fix.

BMW calls the half moon caps that attach the masters to the bar Pipe Clamps lol .

 

[sumoaustin]

I've never had a hydraulic clutch, what's wrong with dot 4? My car uses the same brake fluid for the clutch master cylinder. I stopped using heat shrink for splices and switched to those heat solder ticon connectors that self seal with glue.

 

[Bryan L]

I've never had a hydraulic clutch, what's wrong with dot 4? My car uses the same brake fluid for the clutch master cylinder. I stopped using heat shrink for splices and switched to those heat solder ticon connectors that self seal with glue.

BMW and KTM use mineral oil in the clutch master. Mixing DOT 4 into the oil ruins the seals almost instantly . The cover states what fluid to use , but he assumed like all his Japanese bikes it was dot 4 . Most mountain bikes / road bikes today use mineral oil to in their micro master cylinders with disc brake set ups.

 

[jbird710]

I contacted Bryan about the clutch fluid a couple months back. A friend wanted to install Rox bar risers and the clutch line is too short. I knew I’d have to bleed the clutch once I added an extension and since she was going by Wild West for something else, I asked her to pick up some of the mineral oil. The parts counter guy gave her DOT 4 and said that’s what their mechanics use. Like I said, I contacted Bryan to verify because all of the videos I had seen specifically said exactly what Bryan said; DOT 4 will ruin the seals. Thanks to Bryan for helping me avoid a horrible mistake.

 

[LaserDave]

Let me tell you about putting DOT3 in a 45 year old bike, having the brakes seize up completely, then realizing it's supposed to be DOT5 Silicone.

 

[Tigerkf]

Some people are their own worst enemy!

 

[FE_Rex]

Let me tell you about putting DOT3 in a 45 year old bike, having the brakes seize up completely, then realizing it's supposed to be DOT5 Silicone.

Gotta be careful with them Harleys. My 05 Vrod took DOT5 silicone and the 08 Vrod I had took normal DOT3/4

 

[tsflstb]

Thanks for sharing the info. No pinched wiring but glad I opened this thread as I was just flushing the brake and clutch fluid on the BMW.

I’d read but forgotten about the special clutch fluid and was wondering why it was blue. I’ve got 200ccs of the Magura mineral oil on the way now. Seems like this mistake probably happens a lot.

 

[IOM TT]

Customer smashed wires in pipe clamp.
Left control switch had obvious heat color change to its internal board . The blue turned dark greenish.

After repair all ECU / ABS / TFT faults were able to be cleared.

All functions returned to the new switch gear .

Very nice “aircraft” splice (I learned it in Airplane School). When I splice multiple wires in the same bundle I offset them linearly as best I can. Keeps the “snake swallowed a rat” bump to a minimum. And helps to lessen the chance of connecting the wrong wires, Three-Stooges-style: with water coming out of the stove etc.

Would you happen to know if I connect auxiliary tail light, brake light and turn signal bar to my 2016, R1200 RS and the sensing system freaks out, will removing the offensive wiring eliminate the fault?

It does have a an “EZCAN” or some such “add wiring device” which was installed before I got the bike. It was installed to allow extra, flashing brake light and Motolights. Would it have capacity for more led lights? Thanks, Steve

 

[Bryan L]

Very nice “aircraft” splice (I learned it in Airplane School). When I splice multiple wires in the same bundle I offset them linearly as best I can. Keeps the “snake swallowed a rat” bump to a minimum. And helps to lessen the chance of connecting the wrong wires, Three-Stooges-style: with water coming out of the stove etc.

Would you happen to know if I connect auxiliary tail light, brake light and turn signal bar to my 2016, R1200 RS and the sensing system freaks out, will removing the offensive wiring eliminate the fault?

It does have a an “EZCAN” or some such “add wiring device” which was installed before I got the bike. It was installed to allow extra, flashing brake light and Motolights. Would it have capacity for more led lights? Thanks, Steve

Steve I'm not using Ez Can , but do use Clear water fog lights designed to work with my OEM connector in tail section on the 2023 R1250RS. I can adjust the lights via wonder wheel , and turn signal functions by long press options. I run some aftermarket Can bus turn signals with built in brake lights that work wonderful to .


Link to Weiser for your R1200RS 2016 . I run this same kit.

EXTREME EVO Triple Function Rear Kit - Weiser Technik

EXTREME EVO LED red running/brake light and amber turn signal upgrades. Combined in an intelligent electronic circuit board design, this innovative LED upgrade has 24 powerful automotive standard LEDs: 12 intense red LEDs for the running and braking lights together with 12 ultra amber LEDs for...

www.weisertechnik.com