Increased battery discharge: Fixed!!!

Bassthe1st · 12-13-2014, 08:09 AM

Hi all.

For those who don't remember I was one of those with battery discharge problems. One they the battery would be discharged then it would go back up untill the ASS works again and so on. Very unusual behavior. I was originaly been told that it was because I was not driving enough but I always thought it was some accessories draining the battery. Lately I got the car in because the wipers stop working if they are in action while the engine stops because of the ASS(probably not fixed). Well they told me BMW studied the data from the computer in a more in-dept way then the dealer can do and found out the battery was reading 30% charge when the dealer measured 80%. So basically I was getting discharge warnings because the car was not able to read the battery properly. The replaced the ECU and the battery reading module and all seems fine now.

So I finally get a real car though it really sucks that it took them a year of treating me like I'm stupid to figure it out. Don't have to tell you now when I tell them something the listen! I told them one of the horns didn't work and they just told me they would replace both without even looking at it. Lol

I hope this will help other people in the same situation.

Mike_L · 12-13-2014, 11:19 AM

I've been getting this on my 750 for weeks. I just throw it on the charger every few days, but it never takes much of a charge. Wonder if its the same problem. The car isn't under warranty anymore so its not getting fixed if it is. Not my problem in a week or so, so they can deal with it when its traded in.

Bassthe1st · 12-18-2014, 04:17 PM

Bump.

KneeDragr · 12-20-2014, 08:27 AM

Have you tried a dealer or a shop?

I'd bet a professional could help you with your premature discharge problem.

Bassthe1st · 12-20-2014, 10:48 PM

Quote:

Originally Posted by KneeDragr

Have you tried a dealer or a shop?

I'd bet a professional could help you with your premature discharge problem.

The dealer. No way somebody else would have found the problem.

BavarianFanatic · 12-23-2014, 05:06 PM

Quote:

Originally Posted by Bassthe1st

The dealer. No way somebody else would have found the problem.

It's MORE likely an independent would find it than the dealer. Dealer techs are all young with very little old school troubleshooting ability. If it doesn't turn up on the computer or display a code they're at a loss. If the scanner says there are no problems then they'll swear there are no problems.

While identifying the root cause of a troublesome parasytic drain can be a royal pain, there are very straightforward ways to methodically make your way through the circuits to identify the culprit.

Bassthe1st · 12-23-2014, 07:43 PM

Quote:

Originally Posted by BavarianFanatic

It's MORE likely an independent would find it than the dealer. Dealer techs are all young with very little old school troubleshooting ability. If it doesn't turn up on the computer or display a code they're at a loss. If the scanner says there are no problems then they'll swear there are no problems.

While identifying the root cause of a troublesome parasytic drain can be a royal pain, there are very straightforward ways to methodically make your way through the circuits to identify the culprit.

It was not parasitic drain. Did you even read what I wrote?

smithf80 · 12-23-2014, 08:56 PM

Quote:

Originally Posted by KneeDragr

Have you tried a dealer or a shop?

I'd bet a professional could help you with your premature discharge problem.

Quote:

Originally Posted by Bassthe1st

It was not parasitic drain. Did you even read what I wrote?

LOL you completely missed @KneeDragr 's joke

BavarianFanatic · 12-24-2014, 08:12 AM

Quote:

Originally Posted by Bassthe1st

It was not parasitic drain. Did you even read what I wrote?

My bad. I thought I had responded about the 750. In your case, yes, the dealer or someone with access to the software (like me ;-) ) would need to vet it out. A lot of independents can do a lot more than you'd expect. But obviously you'll work with the dealer in-warranty.

BavarianFanatic · 12-24-2014, 08:13 AM

Quote:

Originally Posted by smithe90

LOL you completely missed @KneeDragr 's joke

Lol, I'm not the only one responding to the wrong comments I see!

smithf80 · 12-24-2014, 08:19 AM

Quote:

Originally Posted by BavarianFanatic

Quote:

Originally Posted by smithe90

LOL you completely missed @KneeDragr 's joke

Lol, I'm not the only one responding to the wrong comments I see!

Whoops

JLStock · 11-30-2017, 05:43 PM

I just bought a 2014 428i with 20k miles. Having the same issue. What would dealer charge to find fault?
I didn’t buy this car to drive and not use accessories. What is the final solution?
Thanks for your time

desmat · 12-01-2017, 10:23 AM

What dealer did you go to ? Just in case

Went at my dealer last winter for a similar discharge problem and they told me I was not driving enough also (14 km from job).
This year at maintenance, they checked level of battery and it's saying 70%. I did plugged in a Noco charger so we'll see how it goes this winter...

HFW003 · 12-01-2017, 07:42 PM

Quote:

Originally Posted by KneeDragr

Have you tried a dealer or a shop?

I'd bet a professional could help you with your premature discharge problem.

I see what you did there

Even if the OP didn’t

12-13-2014, 08:09 AM	#1
Bassthe1st Private First Class 22 Rep 160 Posts Drives: 2017 330i xDrive M Sport Join Date: Jan 2014 Location: Montreal, Qc iTrader: (0)	Increased battery discharge: Fixed!!! Hi all. For those who don't remember I was one of those with battery discharge problems. One they the battery would be discharged then it would go back up untill the ASS works again and so on. Very unusual behavior. I was originaly been told that it was because I was not driving enough but I always thought it was some accessories draining the battery. Lately I got the car in because the wipers stop working if they are in action while the engine stops because of the ASS(probably not fixed). Well they told me BMW studied the data from the computer in a more in-dept way then the dealer can do and found out the battery was reading 30% charge when the dealer measured 80%. So basically I was getting discharge warnings because the car was not able to read the battery properly. The replaced the ECU and the battery reading module and all seems fine now. So I finally get a real car though it really sucks that it took them a year of treating me like I'm stupid to figure it out. Don't have to tell you now when I tell them something the listen! I told them one of the horns didn't work and they just told me they would replace both without even looking at it. Lol I hope this will help other people in the same situation. __________________ Current: 2017 330i xDrive M Sport Past: 2013 328i xDrive, 2008 335XI 6MT, Legacy SPEC.B, MazdaSpeed6(best of all)
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12-13-2014, 11:19 AM	#2
Mike_L Banned 283 Rep 1,961 Posts Drives: 2015 335xi GT M-Sport MPPK Join Date: Jun 2013 Location: New York City iTrader: (2)	I've been getting this on my 750 for weeks. I just throw it on the charger every few days, but it never takes much of a charge. Wonder if its the same problem. The car isn't under warranty anymore so its not getting fixed if it is. Not my problem in a week or so, so they can deal with it when its traded in.
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12-18-2014, 04:17 PM	#3
Bassthe1st Private First Class 22 Rep 160 Posts Drives: 2017 330i xDrive M Sport Join Date: Jan 2014 Location: Montreal, Qc iTrader: (0)	Bump. __________________ Current: 2017 330i xDrive M Sport Past: 2013 328i xDrive, 2008 335XI 6MT, Legacy SPEC.B, MazdaSpeed6(best of all)
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12-20-2014, 08:27 AM	#4
KneeDragr Lieutenant 41 Rep 516 Posts Drives: Planning 2015 ED :) Join Date: Apr 2012 Location: Arlington VA iTrader: (0)	Have you tried a dealer or a shop? I'd bet a professional could help you with your premature discharge problem.
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11-30-2017, 05:43 PM	#12
JLStock Enlisted Member 3 Rep 42 Posts Drives: 2014 BMW 428i XDrive Join Date: Oct 2017 Location: Edinboro PA iTrader: (0) Garage List 2014 BMW 428i XDrive [0.00]	I just bought a 2014 428i with 20k miles. Having the same issue. What would dealer charge to find fault? I didn’t buy this car to drive and not use accessories. What is the final solution? Thanks for your time
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12-01-2017, 10:23 AM	#13
desmat First Lieutenant 37 Rep 311 Posts Drives: F31 M Sport Join Date: Mar 2008 Location: Montreal iTrader: (0) Garage List 2014 F31 M Sport [0.00]	What dealer did you go to ? Just in case Went at my dealer last winter for a similar discharge problem and they told me I was not driving enough also (14 km from job). This year at maintenance, they checked level of battery and it's saying 70%. I did plugged in a Noco charger so we'll see how it goes this winter...
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