Reverser speed sensor questions - BMW Luxury Touring Community
 
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post #1 of 6 Old Nov 11th, 2006, 9:59 am Thread Starter
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Reverser speed sensor questions

I am trying troubleshoot and or get my reverser working without having to take it in to a shop for warranty work.

Does anyone, probably with a schematic, know what to ring out on the sensor and chassis harness. What voltages where and when? And I assume the brown on the chassis connector is ground.

Also, thinking about jumpering past the sensor at the chassis connector, but don't want to do this for risk of damaging the reverser control unit without knowing what pins to jump for sure.

Any help would be appreciated.

Hope your home Mark N.

John

2004 - LT - Anthracite
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post #2 of 6 Old Nov 11th, 2006, 10:46 am
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John,

From the looks of the schematic the speed sensor is a hall effect unit. Three wires to it not sure of the best way to test it as you would have to stimulate it to get a read out with a scope or meter. Most failures have been the micro switches at the control knob or the controller unit itself.

Not too many of the sensors, but there have been some. Most likely symptom is the reverse runs for a short period and stops (one or two seconds). If yours is not starting to move at all I would suspect the micro switches have gotten out of adjustment. Maybe Mark will have better info for you.

John
2009 K1300GT Red Rocket
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2006 Bushtec Turbo+2 Spell
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post #3 of 6 Old Nov 11th, 2006, 12:21 pm Thread Starter
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Thanks for the reply John.

Yes mine starts and stops, fairly sure it's the sensor or sensor circuit. Behaves the same if disconnected. So, since it's a hall effect sensor, in this application it must be normally closed and opens at a certain speed.

I just don't know if it's sinking or sourcing so I can jump it safely.

Maybe someone can help from there.

Thanks again,

John

2004 - LT - Anthracite
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post #4 of 6 Old Nov 11th, 2006, 6:52 pm
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It probably provides a pulse train to the circuits so would be difficult to fake out. Good Luck with it.

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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post #5 of 6 Old Nov 11th, 2006, 10:03 pm Thread Starter
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Quote:
Originally Posted by jzeiler
It probably provides a pulse train to the circuits so would be difficult to fake out. Good Luck with it.

Looks like your right John. The sensor is apparently not just for overspeed, but to ensure a range of speed. Thanks for your help though.

Unable to make it work at all, but on the bright side, I didn't make it any worse either

John

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post #6 of 6 Old Nov 12th, 2006, 8:26 am
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On my '05 had same symptom.. when in reverse, press the starter button, engine speed increased.. the bike almost moves then cycles to idle.

Lonestar swapped it with a good one and presto... back on the road.

...............
J.M.J...
Dcn Channing

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