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Discussion Starter #1
2005 K1200LT came in running with a short that blew fuse for brake lights/horn/alarm
etc,diagnoses the alarm was shorting through he 3 wire connector to the alarm(red/ white). Upon realizing this I then removed
the alarm system no more short and the now bike does not start,found some reading about jumping the 4 wires on the 12 pin terminal
and such upon much dismay no start still,I jumped a switched power lead to the two yellow /black wires it pushed the start button and it turns the
starter.No power at all to the fuel pump relay in all this.
[jtaffuri] 5:01 pm: Returned to the bike the bad alarm system and disconnected the battery. No start still,removed alarm
again installed a used unit with the same p/n # and this is where I am now still no start..Any help with this would be
awesome,seems starter not getting power.
 

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Wrencher Extraordinaire
2005 K1200LT
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You are close - try this.


To get the bike running again you need to jumper the following pins on the 12 pin connector. Pin 3 (black/white/yellow) to pin 11 (black/yellow); this is the starter button signal to the starter relay. Then jumper pin 10 (green/violet, switched power) to pin 6 (blue/violet, engine electronics relay). Now the bike will start and run normally.
 

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Discussion Starter #3
I have done this already there is no start after the wire jumping.
Green & Violet wire pin 10 was not powering on. Any way of checking certain points for why this is not working
 

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2005 K1200LT
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Hey not all BMW tech know a great detail on the LT - that is how this site got started.

Not a Tech for a living but I do know the old girl inside and out - just look at a few of my posts.

The Green Violet is fed from the emergency cutoff relay and that is triggered by the kill switch. The relay is fed by unswitched power and controlled by the kill switch. So either the kill switch is set or the relay is bad. You can check if there are other issues by using a lead to apply 12v to pin 6. If the bike starts then you can trouble shoot the EME relay.
 

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Discussion Starter #8
Got the bike to start and run now, no signals/flashers after partially reassembling, ahhhhhh.
How I did it.:Jumped the kill switch,then ground wire to brn/gry on elect relay, plus jumped 11& 3,10 & 6.
??
J
 

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jzeiler said:
Not a Tech for a living but I do know the old girl inside and out - just look at a few of my posts.
I nominate this as understatement of the Month!
 

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deputy5211 said:
I nominate this as understatement of the Month!
I second that, if that's possible from the southern hemisphere. ;)
 

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2005 K1200LT
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jtaffuri said:
Got the bike to start and run now, no signals/flashers after partially reassembling, ahhhhhh.
How I did it.:Jumped the kill switch,then ground wire to brn/gry on elect relay, plus jumped 11& 3,10 & 6.
??
J
I can't find a Brown/Gray wire on any of the relay diagrams. Engine Electronics relay has a Green/Black (feeds the ECU), a Brown/Green from the Reverser controller, a Blue/Violet from the alarm pin 6, and the Red/Green from fuse F2.

I am not sure just which relay you are refering to.
 

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Discussion Starter #12
The relay behind the fuel pump relay has a Brn/grey wire looks like go'sto the reverser motor ñow the fuel pump relay turns on then off as its sposed to upon key on.
Think I need a new flasher now? No signals or flashers
 

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2005 K1200LT
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OK I see it now. Fuel pump is #4 and #7 is the engine electrics relay. The Brown/Grey from #7 does come from the engine electrics relay coil and goes to the reverser controller and it should be providing a ground to the relay.

I would get the kill switch/eme relay working correctly and try and find out why you have to ground that wire from the relay first before thowing a new flasher in there as so many things are tied together or run throgh other units in this beast. You can chase your tail easily.
 

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Interesting thread about alarms on LT. When I was restoring my LT, I used the knowledge of everyone on this group. The LT was very intimidating, especially to someone looking for a positive outcome and never had a bike like this wonderful machine. After replacing the 25.00 output seal and many other worn parts, came to the alarm and start relay. Looking at the alarm and how it could immobilize the bike during an intentional event or failure, decided to remove all associated components. Replaced the old relay with newer upgrade too. I'm sure some would disagree with this decision and I wouldn't recommend it either way, but for me, another component that will never be a concern. Not too worried about someone stealing it either. She rolled over 100K on the Dragon last August and still going strong. What a machine!!
 

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Discussion Starter #15
Finally got this bike done,flasher green wire had no keyed power,the 12 pin connector has a green wire that's the flasher wire, the 3 wire conector that powers the alarm has a green keyed powered wire .hooked these greens together and solved the flasher problem.
No more alarm system, somewhat happy customer. Thanks for some light on this subject.
Joe
 

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I see that now on the diagram about the switched power coming from the alarm for the flasher. Did some checking and this only applies to the 05 and up. The earlier bikes have switched power provided to the flasher from some where else instead of the alarm. Thanks for the info.
 

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just purchased an 05 with same exact problem, havent gotten manual yet, could you tell me where alarm is located, and dont much need it (bike only came with one ignition key)..best approach to bypass?
 

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2005 K1200LT
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Look at post #2 above and the alarm is under a panel below the top case. Remove top case liner, remove four bolts. Unhook cables (under pillion seat) and remove the panel under it.
 

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This discussion is timely, since I, too, am experiencing alarm problems, but do not wish to start another "alarm problem" thread. My '01 LTC (10-2000 build) with 106XXX miles has been on the maintenance stand this winter for some deer-damage work and a just slightly premature 12K service.

When I re-attached the batt cables, the alarm did its thing, but it did not respond to either the FOB (with fresh CR2032 and attempted sync) or the led device. It's a 12 yo machine with lots of miles--the alarm is no longer important to me. I researched the disarming threads, opened up the backend, located the twelve-pin connector and prepared to jump the appropriate pins only to discover that all wires--save two--are colored solid black.

With reference to the attached photo--and since the pins are not numbered--I assumed that the lower left pin in the white connector body is #1 and that the upper right pin in the black body is #11 (there is no twelfth pin). I jumped 3-to-11 and 6-to-10, turned the key to "on;" the bike performed an uncommanded start and ran normally. I was pleased to have outwitted the alarm, but the uncommanded start function is problematic.

Can anyone (jzeiler, perhaps) identify by number the pins in the photograph, or otherwise explain why the bike (mis)behaved as it did?
 

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