Cruise doesn't engage.. Sometimes - Passes diagnostic's test - BMW Luxury Touring Community
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post #1 of 12 Old Jun 9th, 2015, 2:34 pm Thread Starter
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Cruise doesn't engage.. Sometimes - Passes diagnostic's test

2003 K1200LT

Read through most of the other diagnostic post's here.
Speedometer dial is stable, does not waver at all.
Clutch lever always springs back to fully forward position. While riding, I tried pushing the lever forward while engaging cruise to no avail.
Check brake micro switches by glancing back (at night time) to see brake light coming on. They always work fine.
I adjusted the throttle & cruise cables per the manual settings earlier this year.
Set light goes out as soon as I start to release the throttle from the forward position during the diagnostic test.
It's an 03 but I checked the ABS speed sensor wire and it "looks" fine.
Didn't do an OHM's check though.

I always leave the cruise on/off switch on the on position. Red LED is always on.
When it acts up, I do try toggling it on & off. LED goes off & on.

It's been an intermittent (about 50/50) issue.
Tried yesterday and at first it wouldn't engage.
Kept pressing the set button (10-15 times) and got it to engage.
After engaging, it seems to surge a bit and speed's me up about 5mph faster than I was going.
Seems to do that when most of the time when this intermittent issue comes on.

I usually go thought the diagnostic test that night or the next day. Key off, set button to set, clutch, brakes, etc, ...... all the way to spinning the back wheel. Each time it passes the test normally.

Not sure if it's still doing this when engaged while riding but if I hold the toggle to set/accelerate, the cruise will kick off. If I want to speed up, I always need to bump the set/acc button a few times (i.e. bump for 2mph faster, bump again 2mph, etc.)
Same for deceleration. If I hold it down for a few seconds, it will decelerate until I let go, engage for a second or two then disengage.

Hope this description might help someone with troubleshooting.

About to do a KY to SC trip and would obviously like to have it working.

Regards, Ken


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2003 K1200LT
2005 Yamaha R1
1975 CR125 Elsinore
1974 Honda CB750K4
1974 H2 750 Kaw
1970 Triumph 650
1961 Pan/Shovel
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post #2 of 12 Old Jun 9th, 2015, 3:16 pm
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Re: Cruise doesn't engage.. Sometimes - Passes diagnostic's test

ke sure the side stand is all the way up.
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post #3 of 12 Old Jun 9th, 2015, 3:39 pm Thread Starter
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Re: Cruise doesn't engage.. Sometimes - Passes diagnostic's test

Quote:
Originally Posted by lemdav View Post
ke sure the side stand is all the way up.
Thanks, Didn't know about that one.
I'll try bumping it off the retracted position while riding.

I assumed it wouldn't run if it thought the side stand was out of the "up" position.

I have shifted it into gear while stopped a couple times. With the side stand down, the engine dies.

Regards, Ken


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2003 K1200LT
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1974 Honda CB750K4
1974 H2 750 Kaw
1970 Triumph 650
1961 Pan/Shovel
Couple Mini Trail's QA' & CT's
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post #4 of 12 Old Jun 9th, 2015, 4:53 pm
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Re: Cruise doesn't engage.. Sometimes - Passes diagnostic's test

On my 02 I had to disconnect the sensor on the throttle bodies so the cruise would consistently. Just unplugging the connector worked for me.

Roy Gregersen

Ride Slow, Ride Fast, Always Ride Safe
85 K100RT sold
02 LTC DOA 9/21/14
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post #5 of 12 Old Jun 9th, 2015, 5:55 pm
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Re: Cruise doesn't engage.. Sometimes - Passes diagnostic's test

So what cancels cruise or better put "needs to be adjusted to ensure" cruise
does not drop out infrequently.

Brake Switch on the Right Handle Bar
Clutch Switch on the Left Handle Bar
Brake Switch on the Right Foot Brake
Twisting the throttle forward to de-accel

Is it possible that these switches are being activated without your input!!

Happened to me after a drop and I bent some parts - once I found the switch
(front right brake) I adjusted the switch and problem went away.

My 2 cents . . .

Dan Finazzo
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post #6 of 12 Old Jun 9th, 2015, 6:07 pm Thread Starter
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Had to look in the manual for the throttle body switch. Could be sticking. I'll close & open the throttle a few times if/when it doesn't engage on the next ride.

Brake & clutch micro's seem to operate perfectly. No damage, clean, levered lubed,etc. I can hear, see, feel them operate while it's on the stand also.
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post #7 of 12 Old Jun 9th, 2015, 6:43 pm
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Re: Cruise doesn't engage.. Sometimes - Passes diagnostic's test

Quote:
Originally Posted by CR125Honda View Post
Had to look in the manual for the throttle body switch. Could be sticking. I'll close & open the throttle a few times if/when it doesn't engage on the next ride.

Brake & clutch micro's seem to operate perfectly. No damage, clean, levered lubed,etc. I can hear, see, feel them operate while it's on the stand also.
Most commonly, the intermittent type of Cruise problems are caused by EITHER the Clutch-micro-switch OR the throttle-bodies micro-switch. Easier to see and hear the throttle-bodies switch with left side fairing removed, however the static diagnostic procedure will help you even if fairing is not removed.

Pay attention to video tutorial (see link below in forum) and print a copy of procedure to test near the bike. ALSO, pay attention to warning in PDF file about the common signal of clutch and throttle switches - this can make it difficult to isolate which of these 2 is the cause:
http://www.bmwlt.com/forums/k1200lt/...tml#post533469

Obviously a static diagnostic can only go so far - it cannot reproduce vibrations, road bumps and a user touching the brake pedal while riding. These external factors must also be considered if the static diag does not furnished a clear answer.

Let us know what you find...

-------------------------------------------------
John (Montreal, CANADA)
K1200RS (2002 IceBlue/Red - 96,000 miles)
-------------------------------------------------
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post #8 of 12 Old Jun 9th, 2015, 11:01 pm Thread Starter
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Re: Cruise doesn't engage.. Sometimes - Passes diagnostic's test

Just did a road test.
Took a few try's to engage.
When it did I got the throttle surge (2 to 3 seconds), then it disengaged.
Guess I'll pull the side fairing tomorrow and check throttle body switch and check connectors for corrosion, etc.

Link to video of static test.

2003 K1200LT cruise control test

Regards, Ken


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2003 K1200LT
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1975 CR125 Elsinore
1974 Honda CB750K4
1974 H2 750 Kaw
1970 Triumph 650
1961 Pan/Shovel
Couple Mini Trail's QA' & CT's
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post #9 of 12 Old Jun 10th, 2015, 7:54 am
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Re: Cruise doesn't engage.. Sometimes - Passes diagnostic's test

Quote:
Originally Posted by CR125Honda View Post
Just did a road test.
Took a few try's to engage.
When it did I got the throttle surge (2 to 3 seconds), then it disengaged.
Guess I'll pull the side fairing tomorrow and check throttle body switch and check connectors for corrosion, etc.

Link to video of static test.

2003 K1200LT cruise control test

Regards, Ken
Ken,
In your video, the diagnostic appear to work OK, however it is hard to follow because of all the camera movement.

While the left fairing is OFF, also check for the 3rd cable free play: this is the cable between the cruise-control unit and the Throttle-bodies (TB). The specs for free play are covered in CLYMER manual. When ignition is OFF, you pull on lower part of cable - you should have a small free play (approx 1/8 or 3mm) and then you should feel resistance and see the TB opening as you pull more.

Also, another item I insisted in video is the REAR brake switch: a lot more visible on the video because it was shot on a K1200RS. On the K1200LT the switch is somewhat hidden behind the shiny foot-peg bracket. You really need to listen to this one carefully as I do in video.

QUESTION: while you ride have you ever see any of the 2 RED ABS warnings ?

-------------------------------------------------
John (Montreal, CANADA)
K1200RS (2002 IceBlue/Red - 96,000 miles)
-------------------------------------------------
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post #10 of 12 Old Jun 10th, 2015, 11:06 pm
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Re: Cruise doesn't engage.. Sometimes - Passes diagnostic's test

On my cruise, if I would hit a bump it would go and may or may not reset if I hit resume. If I flicked the clutch lever I could then rest it and then the whole process would repeat it I hit another bump or there were enough rough spots on the road. I pulled the cover to get to the micro switch. The screw holding the switch wasn't very tight. I adjusted the switch and made sure the screw was tight and now it doesn't miss a beat.
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Marty Blok
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post #11 of 12 Old Jun 11th, 2015, 6:37 pm Thread Starter
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Re: Cruise doesn't engage.. Sometimes - Passes diagnostic's test

Thanks for everyone help.
Sailor, that was the best I could do at the time on the video.
Was really just trying to show I made it through the procedure without fault.
Your video was great. Informative and extremely well done.
We all thank you for that.

Think I finally tackled this animal.
Lubed the throttle cables and the twist grip.
Lubed all pivot points on the throttle bodies, including cruise control pivot.
Adjusted the cable per Clymer manual instructions.

Just got back from the test ride and all is well again. Yes.......
Engaged every time, no surge, accelerate/decelerate.....

Guessing I had a combination of issues.
Prior to the repair, the throttle always moved freely and snapped back to position.
It just felt like it could operate a little smoother, with less effort.
Not sure if these cables are supposed to be lubed but they are now.
Seems like I read a post while researching that BMW recalled/replaced the throttle cables on some LT's
Lubing the cables, throttle bodies, etc., gave it a much better feel.
Also, I don't recall warming the engine prior to adjusting the cables last time around.

Regards, Ken


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2003 K1200LT
2005 Yamaha R1
1975 CR125 Elsinore
1974 Honda CB750K4
1974 H2 750 Kaw
1970 Triumph 650
1961 Pan/Shovel
Couple Mini Trail's QA' & CT's
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post #12 of 12 Old Jun 11th, 2015, 7:43 pm
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Re: Cruise doesn't engage.. Sometimes - Passes diagnostic's test

Often the throttle switch can be adjusted at the grip by adding a little slack in the closer cable and it should be done when the engine is warm.

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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