E500 LOW BATTERY WARNING FOR 2 YEARS - Mercedes-Benz Forum
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#1 (permalink) Old 10-27-2010, 11:23 PM
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Angry E500 LOW BATTERY WARNING FOR 2 YEARS

I BOUGHT AN PREOWNED 2005 MB E500 SPORT 2 YEARS AGO & ALMOST FROM THE BEGINNING, I WOULD INTERMITTENTLY GET THE FOLLOWING WARNING:

"LOW BATTERY, CONVENIENCE FUNCTIONS TEMPORARILY UNAVAILABLE", THE LIGHTS AND DASH BOARD WOULD FLICKER & THE RADIO & INTERNAL LIGHTS WOULD BE DISABLED. OTHER THAN THE MESSAGE & ANNOYANCE OF DISABLING THE RADIO, THE CAR DROVE FINE & NEVER HAD TROUBLE STARTING. THE MESSAGE WOULD EVENTUALLY GO AWAY DURING ANY TRIP.

IT USED TO HAPPEN EVERY FEW DAYS & MOST OFTEN WHEN I'M ACCELERATING ON THE HIGHWAY; BUT FOR THE LAST WEEK, IT'S HAPPENING ALL THE TIME & SOMETIMES, THE LIGHTS WILL START FLICKERING EVEN WHEN I JUST START THE CAR. THE CAR IS STILL DRIVING FINE.

WHAT ALARMS ME NOW, IS THAT THE MESSAGE IS STAYING ON FOR MOST OF THE TRIP AND OCCASIONALLY IS ASSOCIATED WITH A SECOND MESSAGE THAT STATES

"ESP MALFUNCTION, VISIT WORKSHOP". ALSO, MY NAVIGATION STOPPED WORKING TWICE. I HAD IT FIXED & AFTER 3-4 MONTHS, THE NAVIGATION WENT OUT AGAIN.

I'M WORRY THAT I MAY HAVE A SERIOUS "ELECTRICAL PROBLEM" WITH THE CAR. IT CAN'T BE THE BATTERIES SINCE IT'S BEEN HAPPENING FOR 2 YEARS NOW.

ANY THOUGHTS?

THANKS,
JKWHSU,
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#2 (permalink) Old 10-28-2010, 07:40 AM
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What's with all of the SHOUTING with your CAPS LOCK stuck?

It is probably the auxiliary battery under the hood that is causing this error message. Do a search as this has been beaten to death on how to replace it, and the symptoms around the failures..
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#3 (permalink) Old 10-28-2010, 07:53 AM
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low battery warning

Would a bad auxillary battery continue to work for 2 years without causing the car not to start? And, would it cause the navigation device to not be detected?

thanks,

JKWHSU
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#4 (permalink) Old 10-28-2010, 09:17 AM
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Yes. The auxiliary battery could go bad for a period of time and you would receive the warning and it would get progressively worse..

Changing the aux battery could be done in 5 minutes or less with a 10mm nutdriver as the only tool..

The auxiliary battery is used for a few devices on the front end of the car as well as switching over to operate the SBC in the event of the rear battery somehow losing power.

If the battery warning is going off i would replace the aux battery at once as it may only be a matter of time until you try to stop and the system has problems..
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#5 (permalink) Old 10-29-2010, 12:13 AM
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Quote:
Originally Posted by aeubank View Post
What's with all of the SHOUTING with your CAPS LOCK stuck?
Specifically when the car has had an issue for two years and suddenly the owner starts to shout here.

If he concludes batteries being fine if the car starts OK, he probably should leave the car for someone else to be looked after. But two years with the big warnings sounds odd, do some owners wait until they face an accident before servicing their cars.
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#6 (permalink) Old 10-29-2010, 03:44 AM
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the auxillary battery will NOT cause the low consumers light to come on, only the rear battery will. when the aux battery fails, it usually causes the battery light to come on in solid red. like said above take it in to have the car looked at, but if i had to take a guess, assuming the main battery is infact good, i would say your alternator may be having issues. when the voltage regulator starts taking a shit i can cause weird issues to the car. the alternator will still charge the car but not at the full capacity. will work at around 12.1-12.5V. on the 55 AMG cars a easy way to tell when the regulator has failed is the cluster lights start flashing as do all the lights in the car. i have had 1 e class 1 time where the regulator was causing the battery/alternator light to come on and off while driving. it would work and then stop working.
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#7 (permalink) Old 10-29-2010, 04:25 AM
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I had the same problem on my 06 e350 TWICE. The first time was the alternator which was replaced under warranty (The dealer replaced all cam shaft magnets at the same time, the tech claimed that they were damaged as a result of the alternator mishap). The second time was a loose connection in the main battery in the trunk which I easily fixed myself.
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#8 (permalink) Old 04-10-2011, 11:39 PM
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Thumbs up Had similar problem, was the alternator

I had a similar problem with my 2006 E500 4matic. The car would sit for 3-4 days and then I would see a low batter/comfort features disabled message. Two months and six separate trips later, the dealer traced the problem to the alternator.

During the first 4 trips they used trial/error and claimed the source of the problem was:
- a loose cable
- faulty BCM
- fault SAM unit
- bad back/front battery

They replaced the SAM and BCM ($1700) and then both batteries, but that didn't solve the problem. Finally they kept the car for 4 weeks and used power meters to systematically isolate the bursty power draw. Finally they tracked the issue to the alternator.

A loose/faulty brush in the alternator would sometimes lineup with the casing and cause a momentary 3 amp current draw that would last 2-3 minutes.

I also spent a lot of time on this board trying to see what others solutions people used. The information available on several different threads was extremely useful. I was able to create a matrix of all possible sources to this problem. I have included this here to help anyone else who has a similar experience.
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#9 (permalink) Old 04-11-2011, 12:20 AM
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It needs to go onto an SDS and have the BCM checked. Also all SAMs as previously posted.

My rear battery was weak and made the car do all kinds nutty things right around New Year's.
Replacement fixed them all. A couple of months later my AGW went bad and was draining
the battery in just a couple of days. Dealer replaced the AGW.
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#10 (permalink) Old 04-11-2011, 03:50 PM
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If the batteries are original they need to be replaced anyway. I just replaced both of mine at NAPA for $190. If you don't want to do it yourself just drive thru the Sears battery line and have them do it. If after that you still have problems take it to the shop but if you go in now they are going to sell you new batteries before doing anything else.

Dan

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