Cruise control speed sensor - BMW Luxury Touring Community
 
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post #1 of 12 Old Aug 26th, 2008, 3:26 pm Thread Starter
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Cruise control speed sensor

Where does the cruise control get it's signal for speed, from the speed sensor in the gear box, the rear ABS sensor or somewhere else?

Thanks for any help.

-Chuck-

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'92 FXSTC
'66 HD Sprint
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post #2 of 12 Old Aug 26th, 2008, 5:19 pm
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Re: Cruise control speed sensor

I believe its from the rear ABS sensor, as that is one of the repairs people have had to make to get the cruise control working again.

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post #3 of 12 Old Aug 26th, 2008, 6:19 pm
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Re: Cruise control speed sensor

It is the rear ABS sensor and it also feeds the speedometer. You will loose both AND have a brake fail light if it goes out.

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post #4 of 12 Old Aug 26th, 2008, 7:44 pm
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Re: Cruise control speed sensor

From 1999 through 2001 with ABS II brakes, the cruise control speed sensor is in the final drive itself and not slaved to the ABS sensor. Beginning with the Integral ABS Brakes in 2002, the cruise control speed sensor is tied to the rear ABS ring.

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post #5 of 12 Old Aug 27th, 2008, 5:20 pm Thread Starter
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Re: Cruise control speed sensor

Quote:
Originally Posted by jzeiler
It is the rear ABS sensor and it also feeds the speedometer. You will loose both AND have a brake fail light if it goes out.
Ok, my speedometer works fine and I don't have an ABS or brake fail light. I tried a new rear ABS sensor and still get a failure on the last step of the cruise control test procedure (rotate the rear tire), I also checked the sensor clearance spec and that is good. When the cruise control shuts itself off it does seem to be speed related, it also sometimes refuses to set at all. I have also checked the clutch and brake switches and they seem ok.

If it is ABS sensor related what other than the sensor itself (that I tried replacing) could cause a speed related cruise control shut down?

Thanks again for any input,

-Chuck-

'05 K1200LT
'92 FXSTC
'66 HD Sprint
IBA #375

"Eat, Drink and be Merry for tomorrow we Ride"
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post #6 of 12 Old Aug 27th, 2008, 7:22 pm
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Re: Cruise control speed sensor

Chuck A while back I took some of the slack out of my throttle cables. the cruise started working intermittently and sometimes not at all. Backed each cable off 1/2 turn,every thing is fine. I had them just a tad to tight.
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post #7 of 12 Old Aug 27th, 2008, 7:22 pm
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Re: Cruise control speed sensor

If it won't set at all, you probably have a microswitch out of adjustment. It may be some road grime on the throttle cable switch or clutch switch.

When you say it is speed dependent, how so? It won't work under 35mph and may have a max (I know it stays set up to 100mph). Does the speedometer drift? Does it bounce when you hit a bump?

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post #8 of 12 Old Aug 28th, 2008, 10:49 am Thread Starter
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Re: Cruise control speed sensor

Quote:
Originally Posted by tbarstow
If it won't set at all, you probably have a microswitch out of adjustment. It may be some road grime on the throttle cable switch or clutch switch.

When you say it is speed dependent, how so? It won't work under 35mph and may have a max (I know it stays set up to 100mph). Does the speedometer drift? Does it bounce when you hit a bump?
The cruise will set about 70% of the time. Once it is set if I go up an overpass, while traveling at interstate speed, it will shut off. I have also had it shut off as I start on a downgrade. When it will not set at 70mph + I have been able to slow down below 70mph and get it to set (sometimes) but it will still only hold for 5-10 minutes or less before shutting down. Again all microswitches checked OK during the test procedures. Also no problems with the speedometer.

I try the test procedure one more time to double check the microswitches.

-Chuck-

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'92 FXSTC
'66 HD Sprint
IBA #375

"Eat, Drink and be Merry for tomorrow we Ride"
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post #9 of 12 Old Sep 1st, 2008, 8:14 pm
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Re: Cruise control speed sensor

My 02 cruise control started acting up on the way home from CCR.

Would not set for the first 100 miles or so and then suddenly started working?

Stopped for a break and would not set the next section of travel.

When I stopped next I straightened (wiggled) the wires running from the sensor at the rear wheel and it worked again but just for awhile and it shut off again. Then worked off and on, no obvious common conditions as to why and when it would shut off or decide to work?

I have heard the zip-ties can cut the wire.
Edit:http://www.bmwlt.com/forums/showthre...cruise+control
I have had the speedo needle bounce at idle occassionally so suspect a wire problem.

Keep us advised what fixes yours.

Doug Holck
Lodi, Ca

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Last edited by dougholck; Sep 1st, 2008 at 8:26 pm.
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post #10 of 12 Old Sep 1st, 2008, 9:48 pm
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Talking Re: Cruise control speed sensor

Hey Doug, I think it must have been that Zermatt air! Mine screwed up also on the ride home from Zermatt. I went to engage it on the slab and it never even gave me the light, let alone engage. However, I found that I could get it to engage by pushing forward on the clutch lever. So I deduced that my clutch microswitch was out of adjustment. But later on it started working just fine without any fiddling, and continued to function just fine all the way home!

At least if it messes up again I know where to go for the fix.

John
Quote:
Originally Posted by dougholck
My 02 cruise control started acting up on the way home from CCR.

Would not set for the first 100 miles or so and then suddenly started working?

Stopped for a break and would not set the next section of travel.

When I stopped next I straightened (wiggled) the wires running from the sensor at the rear wheel and it worked again but just for awhile and it shut off again. Then worked off and on, no obvious common conditions as to why and when it would shut off or decide to work?

I have heard the zip-ties can cut the wire.
Edit:http://www.bmwlt.com/forums/showthre...cruise+control
I have had the speedo needle bounce at idle occassionally so suspect a wire problem.

Keep us advised what fixes yours.

John & Marilyn Fisher
'00 K1200LTC "Katie"
'95 Triumph "Tigger"
'12 Triumph 800XC "Tigger II" (RIP)
'12 Triumph 1200 Explorer "Shadow Tigger"
Hillsboro, Oregon

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post #11 of 12 Old Sep 2nd, 2008, 5:05 pm
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Re: Cruise control speed sensor

Its very likely to be the adjustment in relation to the throtle cable.

Back in mid-05 I had LBBMW do a head to toe on the bike before the 05CCR, and upon driving out and down the street, once above 30MPH, I noticed the CC wasn't working at all.

I drove it right back and Valdie took a quick look, pulled the bike back to the service bay and within 10 minutes had made a small adjustment and that was it.
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post #12 of 12 Old Sep 2nd, 2008, 5:33 pm Thread Starter
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Re: Cruise control speed sensor

All the micoswitches (clutch, front brake, rear brake, throttle rolloff) check OK during the test procedure. Only the ABS sensor (rotating the rear tire) does not check OK. I just checked the wiring harness back to where it goes into a large bundle and did not see any obvious pinches but I did loosen a couple of zip-ties.

If the weather holds out I'll give her another try tomorrow.

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'66 HD Sprint
IBA #375

"Eat, Drink and be Merry for tomorrow we Ride"
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