03 E320 RED BATTERY LIGHT COMES ON DASH - Page 2 - Mercedes-Benz Forum
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#11 (permalink) Old 10-02-2007, 11:16 AM
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I am having the same issue, mostly at night when the lights, etc are on. But now sometimes during the day. My dealer has never said there were any open recalls on my car, so I am going to try the front battery first, then the rear. Will probably buy an Interstate ... do you guys know the type/size I need for the small battery under the hood?

TIA,
Brian

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#12 (permalink) Old 12-11-2007, 12:33 AM
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Well I figured out the problem ... after replacing both my batteries it turns out that I had a bad voltage regulator. Had that replaced and all has been perfect since.

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Brian E. Buxton

President, Buxton Motorsports, Inc .
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#13 (permalink) Old 12-11-2007, 04:28 AM
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Well I figured out the problem ... after replacing both my batteries it turns out that I had a bad voltage regulator. Had that replaced and all has been perfect since.
I thought the voltage regulator should have been part of the recall too. Perhaps it has failed another time?
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#14 (permalink) Old 08-23-2008, 10:20 AM
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I found this thread from last Fall and am having the same problem. How were the problems mentioned resolved? This has been recurring and seems to be fixed and starts again in a day or two. Over several visits, I have replaced both batteries, the voltage regulator and the battery control unit. After the latest BCU replacement it drove fine for a day, and light came on again this morning. The dealer I work with I generally like and they had done the 2005060008 Service Campaign to reprogram the BCU in 2006. I will talk to them to see if they will provide the new BCU at no charge. However, this has still not fixed the problem. Any suggestions? This has become quite expensive now and I still have the same problem. Thanks!
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#15 (permalink) Old 08-23-2008, 01:33 PM
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I found this thread from last Fall and am having the same problem. How were the problems mentioned resolved? This has been recurring and seems to be fixed and starts again in a day or two. Over several visits, I have replaced both batteries, the voltage regulator and the battery control unit. After the latest BCU replacement it drove fine for a day, and light came on again this morning. The dealer I work with I generally like and they had done the 2005060008 Service Campaign to reprogram the BCU in 2006. I will talk to them to see if they will provide the new BCU at no charge. However, this has still not fixed the problem. Any suggestions? This has become quite expensive now and I still have the same problem. Thanks!
Sounds like it could be a alternator issue. I would check it out to see if it is putting the correct power out.
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#16 (permalink) Old 08-23-2008, 02:57 PM
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Had the same problem/issue with my '03 E320 a week or so ago. The dealer first said that software needed to be updated, then a week later the same error message reappeared....at that point he then re-ran another diagnositc program and said there was a bad cell in the aux battery. All has been OK since.
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#17 (permalink) Old 01-27-2009, 04:12 PM
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I have same problem with my '03 E320 a year ago. Add water into the aux battery. work till now.
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#18 (permalink) Old 01-27-2009, 05:43 PM
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This topic is still very valid.. Two weeks ago I had a RED battery light in the dash, visted the MBZ dealer, checked both battery voltage and found that the AUX battery under the hood was not holding a FULL charge. (easy fix) Replaced the battery all is well.
Until this morning.. RED Battery light in dash ( something about consumer equipment not ready) light shut off after a few seconds and has not returned all day. What now...
2003 E 320 65,500 miles
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2007 ML350, Iridium Silver/ Ash MB Tex
1996 S320LWB, Brilliant Silver Metallic / Gray Leather (SOLD)
2004 S500, Black / Charcoal Leather (SOLD)
2006 C230 Sport, Granite Grey / Black MB-Tex / Leather (SOLD)
2003 E320, Brilliant Silver Metallic / Charcoal Leather (SOLD)
2002 ML320, Everest Green Metallic / Java Leather (SOLD)
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#19 (permalink) Old 01-27-2009, 11:53 PM
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My problem is exact same your description.But i had no replaced the battery. It is well till now after add a few water(6 hole).
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#20 (permalink) Old 01-28-2009, 09:14 AM
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Hello, new to this board, I also have had this issue. 05 E500 4matic. Fortunatley I am under warranty and my R.O states:
Test Code 97507----
1 005-541-09-01 Battery (N/C)
540991 Installed updated software in BCM
97507 WMC (N/C)
541126 Battery Replace ( after check)
97507 WMC
32078 Battery light on dash light not on at this time. SDS TEST for coded, prep for test.Check BCM Performed software update, OK. Check Charging System, OK 14.4. Performed Mid Tronics test of main and aux battery. Both Failed. Replaced main battery, OK. Internal Elec Fault 023L-GRAH4

Second Page:
F** Aux Battery Failed Midtronics SMA 1-21-2009 140 PM
Cause: Electrical
541110 Condition of Backup/ Support Battery Check
Post Stamp.... Batt. Part No.
:.....Test
97507 WMC
1 211-541-00-01 Battery
541124 Backup battery replace ( after check)
97507 WMC
32078 Aux Battery Failed Midtronics Replaced Aux Battery, OK
Internal ELC Fault 023L-FQ8HC

I guess my two batteries failed and were replaced under warranty.
I am used to this problem with my Porsche due to the fact that the Pcar is a weekend only kind of car and the battery does not have constant use and charge. But the E500 is the daily driver and I am surprised that both failed after only 40 months. Glad it is under warranty but that will soon end.

Hope this adds to your info base
Joe M
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