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  #1  
Old 11-09-2017, 03:46 AM
johann_muller johann_muller is offline
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K1300R Rear wheel speed sensor plug location

Hi All

This may be a stupid question, but I am unable to locate the Rear Wheel speed sensor plug under the auxiliary power cover on my 2008 K1300R. The DVD shows a location, but I am having difficulty matching that to how things look under the cover there.

Any pointers to removal of the sensor plug will be appreciated!

I am trying to diagnose an ABS Rear Wheel Speed sensor error to decide if the sensor needs replacement, or if the problem is elsewhere. It does look like other people have been in there. Visible small signal wires that are unsleeved is concerning.

Thanks
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  #2  
Old 11-09-2017, 04:19 AM
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Re: K1300R Rear wheel speed sensor plug location

Do you mean the sensor connector to the wiring harness, or the sensor itself?
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  #3  
Old 11-09-2017, 04:24 AM
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Re: K1300R Rear wheel speed sensor plug location

They didn't start making K1300R until 2009, maybe yours is a K12R
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  #4  
Old 11-09-2017, 05:02 AM
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Re: K1300R Rear wheel speed sensor plug location

Quote:
Originally Posted by K-Man!
They didn't start making K1300R until 2009, maybe yours is a K12R

his signature says 2009 K1300, probably a 2008 build 1300
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Old 11-09-2017, 05:32 AM
johann_muller johann_muller is offline
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Re: K1300R Rear wheel speed sensor plug location

My bike was made in Nov 2008 according to the VIN number. European specification, imported into South Africa in January of 2009. Dealer demo for 2 years and finally registered to first owner in 2011. I have started to just use the year of manufacture rather than the registration year.

The plug I am looking for is the Bike Side, where the sensor connects to the wiring harness. The manual does not show a clear picture of where it should be. I want to plug in a test sensor to see if the fault clears, without removing the sensor from the wheel. My mechanic may have some in his spare parts bin. It is a rather expensive part to just replace for a test.

I will digg into the problem on Saturday, and take some pictures. The usual internet searches are not being very helpful.
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Old 11-09-2017, 06:08 AM
paulmogs paulmogs is offline
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Re: K1300R Rear wheel speed sensor plug location

Should be able to get to the plug by removing the "aux" power panel, by the gear lever.
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Old 11-09-2017, 11:20 AM
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Re: K1300R Rear wheel speed sensor plug location

Do you have this drawing?

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Old 11-09-2017, 12:57 PM
johann_muller johann_muller is offline
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Re: K1300R Rear wheel speed sensor plug location

Yes I have the DVD manual. I will take some pictures tonight and upload. I think some people messed with the wires in the past, because it is a mess in there. I could not locate the neat looking wire going into a plug at all, and there are a number of connectors coming together there.

I don't want to make a mess by unplugging the wrong thing. My skills is with the old Ks, this one is still very new to my tools ;-)
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Old 11-09-2017, 01:44 PM
johann_muller johann_muller is offline
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Re: K1300R Rear wheel speed sensor plug location

DSC_0642.jpg

Here is the foto of the location.

I assume the area with the circle around it is the plug I am looking for. There seems to be lots of stuff in the way. This leads to the next question, how to I remove that plug without causing damage?

May it not be easier to get in there from the top? Or is there no access from tank cover side?
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Old 11-09-2017, 01:48 PM
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Re: K1300R Rear wheel speed sensor plug location

Why dont you just follow the wire from the sensor (@the final drive) to the plug?

There are 4 plugs behind the cover.... 3 are for the ESA strut and one for the speedo.

Even if you unplug all of them, it won't do any harm. Just dont hit the ESA button. All the plugs are dummy proof.... they wont fit together if its the wrong one
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Old 11-09-2017, 01:55 PM
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Re: K1300R Rear wheel speed sensor plug location

It does look like that will be needed to get in there. I followed the wire as well as I could. Simply cannot get my fingers in there.

All the exposed very thin wires are making nervous. Extreme care will be needed, and maybe a little insulation before I put it back together.
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Old 11-09-2017, 02:18 PM
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Re: K1300R Rear wheel speed sensor plug location

The speedo cable is the more shiny/soft coated cable.... you'll need to shove 2 thin screws drivers between the plugs to release the locking tabs.

Yes, the 3 wires are not standard for sure. Hope they are not going into/come out of the ABS block..... thats where 99.9% of all speedo problems are coming from.

Whats wrong with the bike anyway? No speedo or no ABS (ABS Warning) or both?
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Old 11-09-2017, 02:46 PM
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Re: K1300R Rear wheel speed sensor plug location

I am getting an ABS code on the Rear Wheel Speed sensor.
I can't remember the exact code. Will scan again over the weekend and post the exact code. The abs is disabled. Speedo is still working, but I assume that is from the front one.

The rest of the GS 911 test results for the rest of the ABS looked correct.

Edit: clarity
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Old 11-09-2017, 06:52 PM
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Re: K1300R Rear wheel speed sensor plug location

Just going to give you a bit of tech knowledge......

The front wheel sensor is only for the front wheel ABS function. The signal is given to the ABS and then it does its magic (in the front wheel circuit).

The rear wheel sensor has the same function, plus it also is the speed sensor.

The rear sensor gives the wheelspeed not directly to the speedometer.
Information about wheelspeed is translated into a digital signal from the ABS Block and sent as a data package to the speedometer which then indicates how fast you are going.

The rear wheel sensor itself can't be faulty, otherwise the speedometer wouldn't work at all.

I would have a look at the 3 cables first, and check your battery voltage before and during startup.....
The ABS doesnt like large voltage drops. It will throw a fault below 9 volt at startup.

The wheelspeed sensor fault could be just a byproduct of undervoltage or an error that has been there for a while.

Another thing to consider is a possible failure of the ABS block itself, stuck motor brushes.....
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Old 11-10-2017, 12:39 AM
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Re: K1300R Rear wheel speed sensor plug location

I am hoping that the ABS unit itself is not the problem. I did see a number of under voltage faults stored in the system, so that is worth exploring.

I built a circuit to test HALL effect sensors a while back, to do the K100's timing. I will see if this can be amended to test the speed sensor. I believe it is a Hall effect sensor as well.

I did a simple test for the speedo. With the bike on the centre stand and the ESC and ABS disabled. The speedo should be picking up speed, if the rear sensor is the only signal supply for the speedo. It did not. The speedo works normally while riding. This is what I base my assumption on that the front wheel sensor is also feeding the speedo.
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Old 11-10-2017, 03:31 AM
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Re: K1300R Rear wheel speed sensor plug location

Quote:
Originally Posted by johann_muller
The speedo should be picking up speed, if the rear sensor is the only signal supply for the speedo. It did not. The speedo works normally while riding. This is what I base my assumption on that the front wheel sensor is also feeding the speedo.


Don't know if this helps?......if I place my 2011 K1300s on the centre stand and run the engine while in any gear, the speedo works!. This indicates to me that the speed sensor is taken from the rear wheel and not the front wheel.
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Old 11-10-2017, 03:56 AM
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Re: K1300R Rear wheel speed sensor plug location

Like Patrique and panason1c say, it is obvious the sensor itself is okay otherwise the speedometer would be dead too.

How did you read the fault? With a GS911? If so you can activate the GS911 brake bleed function and check if the ABS unit is still functioning.
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Old 11-10-2017, 12:37 PM
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Re: K1300R Rear wheel speed sensor plug location

Ok....
Now that would be a first.

Unless someone has rewired the bike to receive the speed signal from the front, then yours must be a "1 off" Museum piece.
All k-bikes get the signal from the rear....All of them!!

Physically, the sensor in the front and back are the same.
The front sensor cable runs on the right side of the fork/bike and the plug is hidden under the right fairing.

I would rais the front wheel and start spinning that.... if it indicates speed, something is definately wrong..... again the speedo gets the signal from the rear only!!
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Old 11-10-2017, 02:45 PM
johann_muller johann_muller is offline
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Re: K1300R Rear wheel speed sensor plug location

Now that is interesting about the speedo. I agree, that usually the speedo should work with the rear wheel raised, if the rear sensor is working.

What I am seeing is that it does not work with the rear wheel raised, but works normally while riding. This points to the ABS computer being smart enough to take the front signal when the rear is not working, giving me hope that it is the sensor and not the controller.

I will know more tomorrow, when I strip the system and have a closer look. I just received a well timed package in the mail, a USB oscilloscope I ordered for my other hobby, electronics. So it should be very simple to test the working of a two wire wheel speed sensor.

I will post my results tomorrow afternoon and we shall see.
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Old 11-11-2017, 02:16 AM
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Re: K1300R Rear wheel speed sensor plug location

Might be worth removing the sensor from the FD and checking that there is no debris/sludge on its tip.
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Old 11-11-2017, 08:56 AM
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Re: K1300R Rear wheel speed sensor plug location

Rear sensor is completely dead. Total open circuit.

It is rather hard to make connection with those tiny pins inside the plug, but I managed by bending some record player cartridge clips closed and connected them.

Here is the fault code from GS 911.

Fault Codes Report

GS-911 version: 1707.2 Datapack version:8.1 Serial Number: GS60612801 Registered to: Johann Muller
Date: 2017/11/11 Time: 3:51:40 PM

Motorcycle VIN: ZV77290

23968: Rear Wheel Speed Sensor : No Signal
The fault is currently present.


I disconnected the sensor and took a ride around the block. The speedo does work.

I am including the ABS version for those who are curious. I seems that the speedo still works on this one without the rear sensor. It is not a weird wiring job as suggested, or the fault would be different.

ECU Info Report

Integral ABS 2 - CAN
Part No.:7711978
HW Version No.:C2
Coding Index:0
Manufacturing Date:2008-10-24
HWOE No.:25697792
Manufacturer:Continental Teves
MCV:0.6.0
FSV:2.2.0
OSV:3.3.0
Free programming slots:1
Serial No.:68AO0017B
Hardware No.:07682002
Hardware star No.:07711978
VIN:ZV77290

EDIT: Did the ABS motor activation test, from the GS911 and it activates normally.
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Old 11-22-2017, 01:52 AM
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Re: K1300R Rear wheel speed sensor plug location

Hi

I just want to quickly post the solution to the problem. Seeing that my new sensor is in the system and working. We now know for sure that on the 2008/9 K1300R european spec, the speedo works even if the sensor wire is completely mangled by the brake disk.

Yes, that is what happened. Bike was in for it's 60k(km) service. Final drive oil and brake pads were replaced by the mechanic. It's 2 months ago, but I have no other explanation for how the wire got loose. All the clips are there and intact.

So there we have it, a mangled sensor wire caused all the consternation.

DSC_0649.jpg

I should have taken the wheel of first and have now learned my lesson.
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Old 11-22-2017, 09:19 AM
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Re: K1300R Rear wheel speed sensor plug location

Thanks Johann. Who would have thought the speedometer can work with the signals coming from both wheels.
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Old 11-23-2017, 03:31 AM
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Re: K1300R Rear wheel speed sensor plug location

I'm not surprised that it has this redundancy.
On my K1200S, I had the LAMPR message coming up but when I checked the lights, I had both Tail light and Brake light appearing to work correctly.

When I pulled the bulbs, I realised that the tail light filament was blown but the bike ECU was running the brake filament at half current when running and switching to full current under brakes.

This is probably the part of the code that has to be changed when fitting the LED lights at the rear.

Very clever engineering!
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Old 11-23-2017, 04:17 AM
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Re: K1300R Rear wheel speed sensor plug location

If only BMW would make the vehicle software accessible...
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Old 11-23-2017, 06:49 AM
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Re: K1300R Rear wheel speed sensor plug location

Access to the software would be lovely. But the GS911 is useful.

This repair and the dead right handlebar heated grip was both diagnosed and fixed with the GS911. The heater was mid summer, so I would only have noticed that in winter.
If I add the fee of going to BMW to have those fixed to the parts, I have change from the GS911 price.

The only thing that may have acted weird with the borked rear sensor, apart from the offline ABS, is the auto-off on the indicators. But I cannot say that for sure, because I have no idea how they should work. After a year of riding the K1300, all I know is that always go off when I want them to stay on and always stay on when I don't.
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Old 11-30-2017, 01:07 PM
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Re: K1300R Rear wheel speed sensor plug location

I think auto off is after 10 seconds or 200 meters. Whatever takes the longest.
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