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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series / 8 Series > 7 Series - E38 (1995 - 2001)

7 Series - E38 (1995 - 2001)

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  #1  
Old 06-25-2010, 07:04 PM
bluem5 bluem5 is offline
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Location: London UK
 
Join Date: Jun 2010
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Mein Auto: 750i sport
00 750 - Immobilised after flat battery

Have a 750i, year 2000, e38 model. As usual, I had a flat battery after leaving the car on the drive for 2 weeks. Charged it as normal, all lights came up on the dash, everything working except the key no longer activates the starter. Have tried a spare key and the same fault appears so it's not likley to be the key. Central locking works, everything is normal apart from the non start.

I've been told that it has to go to a main dealer to have the brain re aligned with the chip in the key and could be quite costly.

I'd appreciate any thoughts or ideas on how the key or brain could start talking to each other again.
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  #2  
Old 07-11-2010, 11:45 PM
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CodyItaliano CodyItaliano is offline
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Mein Auto: 2001 740i
it is possibly you will need to have the car registered at the dealership. usually needs to be done after a battery change. takes about 5-10 minutes to do the service. last i checked they charged $90 US, they didnt charge me to do this last time though. its basically plugging in the service computer or something like that.
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Last edited by CodyItaliano; 07-11-2010 at 11:46 PM.
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  #3  
Old 07-12-2010, 03:15 PM
bluem5 bluem5 is offline
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Mein Auto: 750i sport
Thanks - turned out to be simpler

After checking out on a scanner and verifying the keys to the immobiliser it was cured with a test lamp - turned out to be the starter motor, it decided to just die while the battery was flat ! Not cheap however, 500 fitted by specialists. Thanks for the response.
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  #4  
Old 07-12-2010, 03:53 PM
Jasongind Jasongind is offline
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Location: Tacoma, WA
 
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Mein Auto: '01 740i
Holy snap! Is a starter that hard to replace on one of these cars that it would warrent that kind of price tag. I know my roomate has an ;03 330i, I replaced the power steering pump on and the dealer wanted $976 to do the same job. It only took me about 25 mins start to finish.
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  #5  
Old 07-12-2010, 04:42 PM
balance balance is offline
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Mein Auto: 97 740iL
Two weeks seems like a short time for a good battery to die in any car. Maybe the starter was shorting out the battery for a while and it just finally decided to die.
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  #6  
Old 07-13-2010, 10:54 AM
bluem5 bluem5 is offline
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Location: London UK
 
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Mein Auto: 750i sport
Lesser of two evils

BMW main dealer wanted a lot more, starter was over 300 and 5 hours labour at 105 an hour. How about a quote for respraying the bonnet to deal with a few stone chips for 1350
from my local main dealer last year.
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  #7  
Old 07-13-2010, 11:03 AM
tommyb2b tommyb2b is offline
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Mein Auto: 1998 BMW 740IL
Lesson everyone should learn! Never go to the stealership! find a good indy and it will save you a lot of money!
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  #8  
Old 07-14-2010, 09:26 PM
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PETER NEWMAN PETER NEWMAN is offline
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Mein Auto: BMW 635 CSi BMW 730i E38
non start

I have found many times that if people jump start their BMW from another car whilst they have their own ingnition switched it will spike the key and so wrecking the key in the process. A good battery should not go flat in two weeks and regarding the starter motor I would have suggested giving it a hard tap with a long piece of metal rod to see if it frees itself, Maybe it had jammed after lack of use, I find it very rare that BMW starter motors fail, Peter Newman.
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  #9  
Old 07-15-2010, 03:41 AM
bluem5 bluem5 is offline
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Mein Auto: 750i sport
common problem or to my beemers anyway

I've had E39 M5 , E38 740 and now the 750, batteries go flat in all of them within 2 -3 weeks if left unused. The only beemer that didn't suffer was my E34 M5, possibly due to it being a lot simpler. Strarter on the 750 can't even be seen without raising the car on a ramp, and it's a known problem.. so I'm told.
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  #10  
Old 07-15-2010, 11:10 AM
tommyb2b tommyb2b is offline
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Mein Auto: 1998 BMW 740IL
I have to agree the car is always running in a sense with alarms and things of that nature so in 2 weeks im not surprised it would be dead.
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  #11  
Old 07-15-2010, 12:56 PM
DarkStarMedia DarkStarMedia is offline
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Mein Auto: 01 750iL
ya know... I ahve left my 750 to sit for 3-4 weeks and she started right up... Original battery too

Richard
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  #12  
Old 07-26-2010, 08:21 AM
ProRail ProRail is offline
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Quote:
Originally Posted by tommyb2b View Post
I have to agree the car is always running in a sense with alarms and things of that nature so in 2 weeks im not surprised it would be dead.
If you lock it the car goes to sleep and uses less power. I have left my car at the airport for 2 weeks several times and have not had a problem.
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