problems with k12lt 04 immobiliser - BMW Luxury Touring Community
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post #1 of 5 Old Jun 19th, 2015, 6:26 am Thread Starter
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problems with k12lt 04 immobiliser

Hi all

i'm hoping someone out there can help with a problem i have.

i recently took my 04 Lt to an authorised garage to have the ABS servo swapped out (which went ok) but on the test ride after doing the work the bike broke down (whilst running) with a dead battery. the bike will now not start, its been hooked up to a fault finder and has no faults whatsoever. the fuel pump is kicking in and the starter motor is turning but there is no spark. apparently the alarm is blipping on and off as usual so everything is normal apart from it not sparking.

Has anyone come across this before? if so did you find a remedy?

All info will be greatfully received as this has been goin on for over a month now and my poor mechanic (with 20 odd years experience at a dealership) is pulling his already greying hair out lol

many thanks

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post #2 of 5 Old Jun 19th, 2015, 10:20 am
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Re: problems with k12lt 04 immobiliser

You have to reset the alarm. Dead battery screws up the alarm settings. I don't have the alarm on mine, so someone else will have to chime in on how to reset it.

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post #3 of 5 Old Jun 19th, 2015, 7:58 pm
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Re: problems with k12lt 04 immobiliser

Morning Andy.
Do I understand from your post you have replaced the ABS pump or do you mean by "swapped out "you have removed it and bypassed it ?
Low battery volts cause chaos on these bikes so that would be my first suggestion. Get the battery sorted first.
Re-reading your post sounds like the ABS $$$$ was replaced. Maybe some connections went south during assembly.
Also with respect to Dean, I have often had the battery disconnected on Jenna ( for many many months at a time ) and the alarm has retained all the previous settings. Having said that, they do have a separate internal battery (charged by the bikes system ) to power the unit and I guess that helped. YMMV
If the Alarm LED is still flashing as you said, perhaps in a default mode, then reprogramming it with the fob may help.
I'm sure JZ will chime in and have the answer.

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post #4 of 5 Old Jun 19th, 2015, 10:16 pm
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Re: problems with k12lt 04 immobiliser

Since you are across the pond you have a face lift bike (our 05). Often the alarm does go in to immobilizer ON default if the battery was disconnected for any amount of time. But that also disables the starter so I do not suspect the alarm. Just the same try arming and disarming the alarm (or is that what you meant by the alarm blipping OK) and see what happens. If no joy then we need to look further. Could be a split hose in the fuel tank. You said no spark but did you actually test for a spark and found none? I would suspect the fuel line in the tank as the spark is fed switched power from the ignition switch and fired by the ECU.

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But lack DE, MA, RI and CT with the 2005 LT

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post #5 of 5 Old Jun 21st, 2015, 3:59 pm Thread Starter
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Re: problems with k12lt 04 immobiliser

thanks for the replies guys,

yeah sorry bout the northern uk speech coming out lol

the abs servo was changed for another one and the alarm is switching on and off ( as far as i know) correctly. and there is a new battery now attached to the bike.

as i said in previous the bike broke down on a testride (which my mechanic was undertaking) due to a flat battery (apparently the battery had voltage but immediately lost ampage if thats any help). apparently someone stopped a few minutes later who had a battery booster pack which was hooked upto the bike. this is when the bike refused to start.

as for the spark im not sure if hes taken out a plug and earthed it on the frame to check for spark, i just took it that he has but what i shall do is email him your answers if that is ok with you guys?

many thanks again

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