30d 2002 BMW X5 parasitic battery drain solved!!!
Discussion
I Have to share my absolute joy, at last the thing that has spoiled a pretty good car has a last been solved.
I've been plagued by flat battery's for nearly three years, BMW had the car to look at when the problem first arose and straight away diagnosed a heater fan final resister as the culprit.
well this stopped the fan speed rising and falling at will but the battery would still go flat if not driven for 24 hours.
This meant carrying a power pack in the back just incase of the embarrassing failure.
The last weekend found the battery going flat overnight, so enough is enough back to BMW with it.
They have always said they could't find a problem, and this week for the first day of looking they could not find a drain' so they left it over night with an oscillascope attached and hey presto!! the thing came to life in the middle of the night, they recorded a 2 amp drain. Next day they left it asleep or so they thought in the corner of the workshop.
The mechanic wandered over to check if anything had been going on just at the right time, as he looked the thing flickered into life, so while it was active he started pulling the different module fuses out and when he pulled the telephone command module fuse it stopped drawing.At last problem sorted, as i don't use the phone in the car it won't be a problem not to have it anymore.Just glad to have found the problem, I hope this helps someone out there who is having the same problem.
A Very Happy Bizzy
I've been plagued by flat battery's for nearly three years, BMW had the car to look at when the problem first arose and straight away diagnosed a heater fan final resister as the culprit.
well this stopped the fan speed rising and falling at will but the battery would still go flat if not driven for 24 hours.
This meant carrying a power pack in the back just incase of the embarrassing failure.
The last weekend found the battery going flat overnight, so enough is enough back to BMW with it.
They have always said they could't find a problem, and this week for the first day of looking they could not find a drain' so they left it over night with an oscillascope attached and hey presto!! the thing came to life in the middle of the night, they recorded a 2 amp drain. Next day they left it asleep or so they thought in the corner of the workshop.
The mechanic wandered over to check if anything had been going on just at the right time, as he looked the thing flickered into life, so while it was active he started pulling the different module fuses out and when he pulled the telephone command module fuse it stopped drawing.At last problem sorted, as i don't use the phone in the car it won't be a problem not to have it anymore.Just glad to have found the problem, I hope this helps someone out there who is having the same problem.
A Very Happy Bizzy
A good point VxDuncan, will pass your thoughts on to BMW, i'll let you know what they say, meanwhile i'm the happiest i've been with the car.
They had it on test for another 24 hours after they took out the fuse for the TCM, they recorded no more activity.Maybe they were waiting for something different to wake up.
It will be a while before i trust it 100%, there will always the dought in my mind that it won't start after a long weekend of no use.
Will keep you posted
Bizzy
They had it on test for another 24 hours after they took out the fuse for the TCM, they recorded no more activity.Maybe they were waiting for something different to wake up.
It will be a while before i trust it 100%, there will always the dought in my mind that it won't start after a long weekend of no use.
Will keep you posted
Bizzy
Edited by Bizzybirdy on Saturday 14th November 11:00
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