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Discussion Starter #1
Hi,
I have the issue that my bike will only reverse for several seconds you then
have to press the reverse button again.

I have seached the database for an image of the connector under the right hand side of the tank which can possibly cause this problem, according to
several posts.
Does anyone have an image or the wire colours which I could check before
resorting to replacing parts.

I'm a newbie to this forum, what a great place to find information ....
:bmw:

Thanks very much

Tony

Hobart Tasmania
.......................

1200LT 05 recent purchase
 

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tonycross said:
Hi,
I have the issue that my bike will only reverse for several seconds you then
have to press the reverse button again.

I have seached the database for an image of the connector under the right hand side of the tank which can possibly cause this problem, according to
several posts.
Does anyone have an image or the wire colours which I could check before
resorting to replacing parts.

I'm a newbie to this forum, what a great place to find information ....
:bmw:

Thanks very much

Tony

Hobart Tasmania
.......................

1200LT 05 recent purchase
Tony,
Not sure you really have a problem.
Once you turn the Reverse selector on the left side, you should leave the throttle at idle and then hold down the reverse button until you have finished your maneuver. You can add a little bit of throttle if necessary.
 

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Discussion Starter #3 (Edited)
I hold down the reverse button and the engine revs slightly increase
then after just a few seconds of reverse the bike stops, I then have to
release the button and press again, the bike instantly reverses again.
This isn't a huge problem but I believe it's not normal.
I know that the starter motor is used in reverse so it makes sense that the
motor is not run for an extended period. But reading old posts on this subject
seems to indicate that this is not normal, although lots of owners seem to have experienced the problem.
There is an old post explaining various causes of the issue but the images
are no longer on the page.
http://www.bmwlt.net/ubbthreads/showthreaded.php?Cat=&Board=K1200LT&Number=183766&page=0&view=collapsed&sb=5&o=7&vc=1

Thanks
Tony
..............
1200LT 05
 

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I had the same thing and it turned out to be the reverse sensor....dealer fixed it under warranty. I tried the connections that you mentioned, but that was not the problem for me. Has it ever worked properly? I bought the bike used and it wasn't working when I got mine. My bet is on that sensor....dealer had it fixed in 30 minutes.


Ron
 

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Hi Tony,

the connector that you are referring to goes to the "rotation sensor" on the right side of the gearbox. The purpose of this sensor is to verify that an axle inside the gearbox is rotating. If there is no signal (because of faulty sensor or bad connection in the connector) the reverse runs only short time and then stops. The connector itself is located under the gas tank on the right side of the bike. The other connector is for the gas pump (located inside the gas tank) and the other one is for this sensor.
I have experienced the same problem and in my case my dealer started searcing the problem from the other end and practically all the parts connected to the reverse control were changed (luckily under warranty) before the problem was found in this faulty sensor. However, there have also been many cases that the sensor is OK but this connector is pulled too tight with a zip-tie and thus causing a problem.

Regards
 

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tonycross said:
I hold down the reverse button and the engine revs slightly increase
then after just a few seconds of reverse the bike stops, I then have to
release the button and press again, the bike instantly reverses again.
This isn't a huge problem but I believe it's not normal.
I know that the starter motor is used in reverse so it makes sense that the
motor is not run for an extended period. But reading old posts on this subject
seems to indicate that this is not normal, although lots of owners seem to have experienced the problem.
There is an old post explaining various causes of the issue but the images
are no longer on the page.
http://www.bmwlt.net/ubbthreads/showthreaded.php?Cat=&Board=K1200LT&Number=183766&page=0&view=collapsed&sb=5&o=7&vc=1

Thanks
Tony
..............
1200LT 05
I emailed David Mack, as the pics were posted on his site that is now inaccessible. Hopefully he still has the pics.
 

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Tony I have had the sam symptoms on mine from day one, I just thought it was normal. I am very much out of warrantee so I guess I will live with it. Thankfully for me I have only used reverse a few times.
Good luck
 

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had the same problem on my 05. Dealer found loose plug connection on under side of bike. after full insertion no problem.
 

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tonycross said:
I hold down the reverse button and the engine revs slightly increase, then after just a few seconds of reverse the bike stops, I then have to release the button and press again, the bike instantly reverses again.
This isn't a huge problem but I believe it's not normal. ...
For more recent reading on this same subject.

http://www.bmwlt.com/forums/showthread.php?t=33533

I don't think it is 'normal' either...
 

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2011 R1200RT
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kellenbenz said:
I had the same thing and it turned out to be the reverse sensor....dealer fixed it under warranty. I tried the connections that you mentioned, but that was not the problem for me. Has it ever worked properly? I bought the bike used and it wasn't working when I got mine. My bet is on that sensor....dealer had it fixed in 30 minutes.


Ron
Same thing here on my 05, also repaired under warranty.
 

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OU812 said:
Still hope to see a pic of said connector(s). :(
Attached is a photo from tmgs (Tom Gallo) showing a close up of the connector. The connector is located next to the frame rail on the right side next to fuel pump connector. Follow the wires back to the rh top of the tranny. If all wires check good from the connnector to the ABS unit, the sensor is a good bet. Easy to change on your own with a shortened 5mm allen I think.
 

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Discussion Starter #14
Folks,
Thanks for the feedback I'll give it a go later today and feedback what I find

I'm an Electronics engineer and the 3 wires would make sense as Gnd . 12V and Signal Out - Usually a squarewave (switching from Rail to Gnd) from the rotation sensor.

Best wishes
Tony

.............
1200LT 05
 

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bowlesj said:
Attached is a photo from tmgs (Tom Gallo) showing a close up of the connector. The connector is located next to the frame rail on the right side next to fuel pump connector. Follow the wires back to the rh top of the tranny. If all wires check good from the connnector to the ABS unit, the sensor is a good bet. Easy to change on your own with a shortened 5mm allen I think.
Thanks! :)
 

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Discussion Starter #16
mmm interesting, I just checked the connector it seemed to be
well seated and clamped to the frame I removed the rotation sensor
and had a look, not much to see a sealed unit, must be a hall
effect sensor detecting a magnet inside the gearbox maybe.
Maybe I will order a replacement and see how I go.

:bmw:
Thanks again
Tony
 

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tonycross said:
mmm interesting, I just checked the connector it seemed to be
well seated and clamped to the frame

:bmw:
Thanks again
Tony
This can be the point Tony, sometimes the connector has been TOO well clamped to the frame and the connection has been lost there. I have totally cut the zip-ties out of mine and the connector stays there fine just tucked behind the frame.

Regards
 

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Had the same problem with my 2007. Dealer replaced the reverse sensor under warranty...resolved problem.
 

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bowlesj said:
Attached is a photo from tmgs (Tom Gallo) showing a close up of the connector. The connector is located next to the frame rail on the right side next to fuel pump connector. Follow the wires back to the rh top of the tranny. If all wires check good from the connnector to the ABS unit, the sensor is a good bet. Easy to change on your own with a shortened 5mm allen I think.
hahah, this is funny, I'm just now replacing the reverser controller I bought here what over a year ago!, and the reason I found this , BTW Howdy!


I have the LT on the lift half tore down right now, new exhaust (my old one was broken again) doing a full service on her and will decide to put her up for sale or nort within a week or two she only has 154k miles on her
 

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tmgs said:
hahah, this is funny, I'm just now replacing the reverser controller I bought here what over a year ago!, and the reason I found this , BTW Howdy!


I have the LT on the lift half tore down right now, new exhaust (my old one was broken again) doing a full service on her and will decide to put her up for sale or nort within a week or two she only has 154k miles on her
Hi Tom. Just giving credit where credit was do. And see, I'm glad I did or you'd find me to be a fraud:)

I see John Z helped get you going. Congrats.

Later
 
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