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post #1 of 37 Old Dec 26th, 2006, 2:00 pm Thread Starter
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Speedometer Problem

I just swapped out my failed rear drive for a spare I have. Now the speedometer doesn't work. I checked the gap at the sensor ring. It's within range. I have clipped most of the tie-wraps holding the cable and flexed the wire-nothing.
This is on a '03 LT.

Any suggestions?

Dan Martin
Houston, Tx
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post #2 of 37 Old Dec 26th, 2006, 2:34 pm
 
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What year LT did the spare drive come from?
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post #3 of 37 Old Dec 26th, 2006, 2:39 pm Thread Starter
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Quote:
Originally Posted by messenger13
What year LT did the spare drive come from?
It's the original drive that came on the bike. I swapped them out a year ago and now the replacement failed and i went back with the original that was rebuilt early this year.

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post #4 of 37 Old Dec 28th, 2006, 9:49 am
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An Update???

Dan,

Have you gotten this problem diagnosed and corrected yet?

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post #5 of 37 Old Dec 28th, 2006, 11:03 am Thread Starter
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Quote:
Originally Posted by cccpastorjack
Dan,

Have you gotten this problem diagnosed and corrected yet?
Nope, no change. I will probably take it to the dealer tomorrow and hook it up to the Moditec.

dan
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post #6 of 37 Old Dec 28th, 2006, 11:25 am
 
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On the same line I have a 99 LT and my speedo says I'm going about 10 miles faster than I am, any ideas?
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post #7 of 37 Old Dec 28th, 2006, 11:30 am
 
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Quote:
Originally Posted by Clem
On the same line I have a 99 LT and my speedo says I'm going about 10 miles faster than I am, any ideas?
That's not "on the same line" at all. That is totally normal. And according to govenment regulations, totally acceptable. There is a speedometer correction mod. Use the search. It's a fun one.
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post #8 of 37 Old Dec 28th, 2006, 11:32 am Thread Starter
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Quote:
Originally Posted by Clem
On the same line I have a 99 LT and my speedo says I'm going about 10 miles faster than I am, any ideas?
Go to Hall of Wisdom,common issues,4th subject,read on
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post #9 of 37 Old Dec 28th, 2006, 12:46 pm
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You can also buy the YellowBox from our friends Down Under, Black Robotics. They claim that it not only corrects your speedo, but your odometer as well. Seems to be a simple enough install, and correcting the odometer may save you from getting shorted on your warranty coverage.

Of course, there may be other ramifications that I am not aware of, and I will leave it to our fellow members to chime in with any other important info.

BTW, I found out about this device through a thread here on BMWLT.com, and a search may yield you some additional info as well.

Quote:
Originally Posted by Clem
On the same line I have a 99 LT and my speedo says I'm going about 10 miles faster than I am, any ideas?

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post #10 of 37 Old Dec 28th, 2006, 12:52 pm
 
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Quote:
Originally Posted by deputy5211
You can also buy the YellowBox from our friends Down Under, Black Robotics.
I have yet to hear of someone having 100% success with these. Makes the needle jumpy all of the time.
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post #11 of 37 Old Dec 28th, 2006, 9:54 pm
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Quote:
Originally Posted by deputy5211
You can also buy the YellowBox from our friends Down Under, Black Robotics. They claim that it not only corrects your speedo, but your odometer as well. Seems to be a simple enough install, and correcting the odometer may save you from getting shorted on your warranty coverage.

Of course, there may be other ramifications that I am not aware of, and I will leave it to our fellow members to chime in with any other important info.

BTW, I found out about this device through a thread here on BMWLT.com, and a search may yield you some additional info as well.
The yellow box does not work well at all on the LT. Besides, the Odometer is not off nearly as much as the speedo, and even if the yellow box worked, it would lower the odometer much too far, making it read about 6-7% low. The speedos are off about 10% high, the odo about 3%high. The speedo correction by soldering the jumpers in place (pre-2005 models only) does not affect the odometer at all, where the yellow box affects both.

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post #12 of 37 Old Dec 28th, 2006, 10:12 pm
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Quote:
Originally Posted by dshealey
The yellow box does not work well at all on the LT. Besides, the Odometer is not off nearly as much as the speedo, and even if the yellow box worked, it would lower the odometer much too far, making it read about 6-7% low. The speedos are off about 10% high, the odo about 3%high. The speedo correction by soldering the jumpers in place (pre-2005 models only) does not affect the odometer at all, where the yellow box affects both.
Thank you for sharing your insights. Where does one find the jumpers that need to be soldered? How much of the bike do I have to take apart to get to it?

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post #13 of 37 Old Dec 28th, 2006, 10:24 pm
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Quote:
Originally Posted by deputy5211
Thank you for sharing your insights. Where does one find the jumpers that need to be soldered? How much of the bike do I have to take apart to get to it?
As was posted earlier in this thread you can find the information in our 'Technical' pulldown at the top of the page under 'Hall of Wisdom'. The part about the speedometer is here.

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post #14 of 37 Old Dec 28th, 2006, 10:25 pm
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Quote:
Originally Posted by DanMartin
I just swapped out my failed rear drive for a spare I have. Now the speedometer doesn't work. I checked the gap at the sensor ring. It's within range. I have clipped most of the tie-wraps holding the cable and flexed the wire-nothing.
This is on a '03 LT.

Any suggestions?

Dan Martin
Houston, Tx
Hi, Dan: speedo is not driven by that external sensor that needs gap setting. This is for ABS. Speedometer is driven by the sensor that plugs into top of the FD case.

So, hopefully you did not break the connecting wire for the sensor. I'd still check the sensor itself: pull it out of the drive and see if there is maybe some debris sticking to it.

I noticed that it really needs to be fully worked into the final drive before tightening up. Maybe you have it still partly up and crooked by pressure of mounting screw?

Robert in Northern NJ

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post #15 of 37 Old Dec 28th, 2006, 10:43 pm Thread Starter
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Quote:
Originally Posted by rdwalker
Hi, Dan: speedo is not driven by that external sensor that needs gap setting. This is for ABS. Speedometer is driven by the sensor that plugs into top of the FD case.

So, hopefully you did not break the connecting wire for the sensor. I'd still check the sensor itself: pull it out of the drive and see if there is maybe some debris sticking to it.

I noticed that it really needs to be fully worked into the final drive before tightening up. Maybe you have it still partly up and crooked by pressure of mounting screw?
Nope, the '02s and later use the same sensor for speedo and ABS.They don't have the sensor you are refering to.

Dan
'03 LT
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post #16 of 37 Old Dec 29th, 2006, 5:12 am
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Quote:
Originally Posted by deputy5211
Where does one find the jumpers that need to be soldered? How much of the bike do I have to take apart to get to it?
If you're not comfy with taking the LT down, that's one you prolly should ride over to my house for.



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post #17 of 37 Old Dec 29th, 2006, 10:11 am
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Quote:
Originally Posted by grifscoots
Quote:
Originally Posted by Deputy5211
Where does one find the jumpers that need to be soldered? How much of the bike do I have to take apart to get to it?
If you're not comfy with taking the LT down, that's one you prolly should ride over to my house for.
I got some easy instructions from the good Deacon on removing the nose cone. With those plus the H.O.W. "Tupperware Paty" post, I was OK with trying that this weekend and running some new wires to the front for iPod, GPS, and Phone.

It's the speedo R/R that is a bit spooky. Also have a couple of light bulbs to replace on the speedo while it is out for soldering. So . . . I think I'll wait for the next local tech session to do the speedo fix, as it is not urgent and I don't want to hose it up my first time in.

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post #18 of 37 Old Dec 29th, 2006, 9:40 pm
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Quote:
Originally Posted by DanMartin
Nope, the '02s and later use the same sensor for speedo and ABS.They don't have the sensor you are refering to.

Dan
'03 LT
Hi, Dan:

Ooops - my bad. The newest machine I have is an '01. Did not know that the design was changed since.

Anyway, discounting the above discussion about inaccuracy of the indicator, you stated that after the swap it stopped working altogether, right?

If so, presuming you did not work on anything else, the suspect items are what you touched, that is the sensor and the wires. I am guessing that you did not open or reconnect any jumpers or connectors, right?

Once the gap is confirmed, I would say that the sensor did not fail - it is enclosed and rather sturdy. It is quite likely that a wire broke in the sensor cable. I would suspect the connecting cable: it does flex, it is stressed and it is normally squeezed by a tie-wrap.

I do not recommend that (NO!), but if it happened to me, I'd figure that there is not much to loose and I'd cut open the jacket of the sensor cable. I do not know if it is just a magnetic pickup coil or a Hall sensor (maybe someone can chime in), therefore checking continuity through sensor may not work. I'd split the cable by the sensor itself and then as high up swingarm as possible and hope to find broken cable. You may just get lucky - and then fix the open jacket with electrical tape: ugly, but effective.

Any luck in the meantime?

Robert in Northern NJ

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post #19 of 37 Old Dec 29th, 2006, 10:34 pm Thread Starter
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Robert, No I did not disconnect any connectors. I have undone the cable and flexed it with the bike running,no signal. I thought maybe a blown fuse, nope.
Talked to the dealer a few days ago while getting parts for fixing the rear drive. Their only suggestion was to hook it up to the Moditec. I will take it over tomorrow.
I've been shut down for the past two days while SWMBO and I replace the carpeting in our bedroom with laminate.

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post #20 of 37 Old Dec 30th, 2006, 6:23 am
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Smile Speedo Sensor = Transmission

Quote:
Originally Posted by DanMartin
I just swapped out my failed rear drive for a spare I have. Now the speedometer doesn't work. I checked the gap at the sensor ring. It's within range. I have clipped most of the tie-wraps holding the cable and flexed the wire-nothing.
This is on a '03 LT.

Any suggestions?

Dan Martin
Houston, Tx
The speedo sensor attaches to the right side of the transmission. The ABS sensor on the FD does not play a roll in this measurement.
This should help steer you in the correct direction.

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post #21 of 37 Old Dec 30th, 2006, 12:19 pm
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Does the Speedo "Power Up"???

Dan,

When you turn the ignition switch on, does the speedo "Power up"? Does the speedo move at all either when turning off or on?

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post #22 of 37 Old Dec 30th, 2006, 12:57 pm Thread Starter
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Quote:
Originally Posted by cccpastorjack
Dan,

When you turn the ignition switch on, does the speedo "Power up"? Does the speedo move at all either when turning off or on?
No movement at all.

dan
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post #23 of 37 Old Dec 30th, 2006, 1:28 pm
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A Little Help???

Quote:
Originally Posted by DanMartin
No movement at all.

dan
Alright,

his speedo has NO MOVEMENT at all when he turns on the switch....Could some of you guys who know the electrical circuitry of the LT chime in???

I am leaving and do not have time right now to go over schematics, but it seems to me that having no power to speedo should be fairly simple to trace if he knows where to start and has a test light or volt meter. (Or so it would seem -- unless of course it's the computer ).

Could someone help Dan with a starting point for voltage??? That is, if the wires/conectors aren't hidden 'neath the tupperware...but, BMW would NEVER do that!!!

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post #24 of 37 Old Dec 30th, 2006, 9:29 pm Thread Starter
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Took it to the dealer today. Moditec shows the sensor faulty. But they gave me the sensor part number for a bike with ABS II, I am pretty sure I have Integral ABS. Will take the sensor off tomorrow and strip the wires.

Riding without a speedometer means:
1. No cruise control...I really need to change cables
2. no auto volume adjust on radio.
3. No BC info.


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post #25 of 37 Old Dec 30th, 2006, 9:56 pm
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Man,

I really hate to hear that you had to take it to a dealer. I am very sorry I did not have time to research it and help out.

May God bless you for many miles to come. Again, I apologize.

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post #26 of 37 Old Dec 30th, 2006, 10:00 pm
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Do your calipers say Brembo or BMW?? If Brembo you have ABS II and if BMW then you have Integral ABS. Hope this helps.

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post #27 of 37 Old Dec 30th, 2006, 10:11 pm Thread Starter
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Quote:
Originally Posted by cccpastorjack
Man,

I really hate to hear that you had to take it to a dealer. I am very sorry I did not have time to research it and help out.

May God bless you for many miles to come. Again, I apologize.
thanks Jack, no problem. The dealer wanted me to bring it in to talk about a trade in anyway. I'm not really interested as I am just getting this one farkled correctly. The new one they wanted to move was black...no thanks...requires keeping clean. Mine get washed 1-2 times a year. I'll work on it some more tomorrow.

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post #28 of 37 Old Dec 30th, 2006, 10:14 pm Thread Starter
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Quote:
Originally Posted by Steve_R
Do your calipers say Brembo or BMW?? If Brembo you have ABS II and if BMW then you have Integral ABS. Hope this helps.
Thanks Steve_R. I know i have seen that somewhere before. I just went out to garage to check. Definitely say BMW on them.

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post #29 of 37 Old Dec 31st, 2006, 7:34 am
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Smile Post # 20

Quote:
Originally Posted by murray
The speedo sensor attaches to the right side of the transmission. The ABS sensor on the FD does not play a roll in this measurement.
This should help steer you in the correct direction.
You may have missed my post earlier. Post # 20, the answer was there all along

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post #30 of 37 Old Dec 31st, 2006, 3:03 pm
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Same problem here!

Quote:
Originally Posted by DanMartin
Took it to the dealer today. Moditec shows the sensor faulty. But they gave me the sensor part number for a bike with ABS II, I am pretty sure I have Integral ABS. Will take the sensor off tomorrow and strip the wires.

Riding without a speedometer means:
1. No cruise control...I really need to change cables
2. no auto volume adjust on radio.
3. No BC info.


dan
Dan,
I've got the same thing going on with my bike. The speedo, odometer, OBC and cruise control work intermittently. I too bought a speed sensor. It is nothing like what is on my rear drive (02 model). I have the older manual which show the ABS and Speed sensors both in the rear drive but seperate. I assume if the sensor for the speedo and ABS were bad on the 02 model I would also be getting a fault in the ABS system as well on the 02 model. The dealer here sold me a speed sesor but it seems to be for the "PRE 02" models with the sensor seperate.

All I need now is an electrical diagram to see where the speed signal is going.
Maybe I could find the intermittent open circuit.

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post #31 of 37 Old Dec 31st, 2006, 11:09 pm
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The speedo sensor wire almost always breaks where the wire is tie-wrapped to the metal ferule on the brake line. I would cut that tie wrap and maybe another tie wrap or two and carefully inspect the plastic sheathing on the wire. Look for a little crimp, and you'll probably find the wire bends very easly at this point because a conductor is already broken. This can be fixed with a soldering iron and a little heat-shrink tubing, right on the bike.



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post #32 of 37 Old Dec 31st, 2006, 11:19 pm Thread Starter
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Quote:
Originally Posted by kdog
The speedo sensor wire almost always breaks where the wire is tie-wrapped to the metal ferule on the brake line. I would cut that tie wrap and maybe another tie wrap or two and carefully inspect the plastic sheathing on the wire. Look for a little crimp, and you'll probably find the wire bends very easly at this point because a conductor is already broken. This can be fixed with a soldering iron and a little heat-shrink tubing, right on the bike.

Regard,
-joel
i have removed the sensor and cable,stripped at both ends and verified continuity on both wires. I will order a new sensor Tuesday

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post #33 of 37 Old Jan 1st, 2007, 10:04 am
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Now hold on everyone.

Dan has an 03 and Stephen has an 02. Each of these has the integral brakes and therefore no speed only sensor in the rear drive, just like Mike Sheldons should have been.

Based on the wire schematics in the Clymer (which leave a lot to be desired since they are just schematics not true wire diagrams, yes there is a difference), the maybe late 01's and certainly above use the ABS sensor to send a signal to the ABS control module and the speedo signal comes from the ABS module.

If I'd known this last week I wouldn't have commented on Jack and Mike's possible damaged wire, sorry Jack.

So based on that limited knowledge, Both Dan and Stephen may have bad ABS sensors.

After that I don't know anything about the ABS system to trouble shoot it, may require a dealer diagnostic trip, as Dan did to indicate his bad sensor. But I wouldn't be afraid to try a new sensor as a spare wouldn't hurt anything.

Let us know Dan.

Oh also a good idea to verify the part numbers, as Dan did, of any brake components purchased, dealers are always mixing the two.

John

2004 - LT - Anthracite

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post #34 of 37 Old Jan 5th, 2007, 12:49 pm Thread Starter
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problem over

The dealer was right. The sensor was bad. Installed a new sensor and speedometer now works great.

Thanks for all the ideas.

dan
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post #35 of 37 Old Jan 5th, 2007, 6:30 pm
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Glad you got that fixed, Dan. Does this mean you'll be getting rid of your high-tech cruise control lever I saw last weekend?

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post #36 of 37 Old Jan 5th, 2007, 11:01 pm Thread Starter
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Originally Posted by deputy5211
Glad you got that fixed, Dan. Does this mean you'll be getting rid of your high-tech cruise control lever I saw last weekend?
Yea, that hose clamp and plexiglass has been put aside for next time.

dan
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post #37 of 37 Old Jan 6th, 2007, 11:39 pm
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Location: Mesquite, TX, USA
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Quote:
Originally Posted by DanMartin
The dealer was right. The sensor was bad. Installed a new sensor and speedometer now works great.

Thanks for all the ideas.

dan
Dan, I wish it had turned out that easy with my speedo problem. I picked up my new rear sensor yesterday(thinking it might be the magic cure) and installed it. Took it out for a drive and still no joy. Looks like its off with the fuel tank to get at the wiring harness. I've done a little studying and noticed there are some connections going to the dash cluster in the obis under the fuel tank.

Only a biker knows why a dog sticks his head out of the car window
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