SL500 2003 Battery drain mystery - Page 3 - Mercedes-Benz Forum
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post #21 of 40 (permalink) Old 05-14-2013, 04:05 PM
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I AM SORRY TO SEE YOUR POST SO LATE, BUT I HAD THE SAME PROBLEM. THERE IS A LARGE POST FOR THIS PROBLEM WHERE A FELLOW OWNER CAN EXPLAIN HOW TO WATERPROOF THE LITTLE UNIT, AND IT IS BRILLIANT! 2004 SL500


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post #22 of 40 (permalink) Old 05-05-2015, 10:22 AM
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I don’t know if this will help. I owned a S500 2001 for 8 years. Everything was working fine for six months then one morning the car battery was flat. I replaced the battery with MB part. Within a week of the car standing I had a flat battery. It was unresolvable without spending more than the car’s value.

So I resigned myself to disconnecting the negative lead from the battery and reconnecting when I needed to use the car. I did this until the replacement battery needed to be replaced again around 4 years after purchase.

I replaced the battery and hey presto the drain stopped. For 2 years until I p/x the car. I removed the battery but did not install the new one until the next day.

By leaving the car without power over night seemed to resolve the drain.

Now I own a SL500 2005 and yes I have a battery drain (intermittent) because it's been getting worse over the last 6 months. I only use the car summertime I purchased I new battery yesterday thinking that the old one was tried and due for replacement. Over night flat battery. I am going to disconnect all power to the car via the two batteries over night and reconnect in the morning.

By doing this will I have to have the keys re programmed or any thing else??
I had no issues with the S500 after the re connection.
Any help Thanks in advance.
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post #23 of 40 (permalink) Old 05-05-2015, 05:18 PM
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Make sure batteries are disconnected and reconnected in the correct order.

You may need to perform some "normalisation" procedures once batteries are reconnected. See attached PDF's.
Attached Files
File Type: pdf Battery Dual Battery[1].pdf (1.66 MB, 939 views)
File Type: pdf Battery failure 218 Mod 2-8 Normaliation of Systems (MBK) 1-22-02.pdf (113.7 KB, 974 views)
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post #24 of 40 (permalink) Old 05-06-2015, 12:40 PM
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Thanks for the info and *.pdf. I am thinking I will reinstall the old battery (slow drain over 5-7 days) as the new battery is shutting the system down after a few hours. Or is the "wake-up" at fault because within 10 minutes everything is back up and running normally..?
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post #25 of 40 (permalink) Old 09-22-2015, 09:45 AM
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I was wondering if by any chance someone would know where I could find the starter located at?
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post #26 of 40 (permalink) Old 12-01-2016, 09:40 PM
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Just my two bits on this old thread but still a common problem , especially with the SL's . The rear battery warning generally leads to the discovery of other issues.The Auxiliary Battery powers "ELECTRICAL CONSUMERS" - these are the heavy hitters that no starting battery could ever hope to power. The sound systems draw a lot - 400 watts original , I have an 850 watt in my SL500 now. But it is the stuff that the car constantly monitors - the pressure in the Brake and ABC system that are the really big draws. Every time you open the door on the car the large ABS/SBC pump motor goes on to charge the accumulator. The ABC tries to level itself whenever the car is disturbed. With age none of these parts hold pressure for more than a few days - so the battery has to come into play. You can spend many thousands of dollars over really minor issues with ABC equipped cars. Don't drive yourself crazy over this. It is a Mercedes - different. Plus - starting is less of a problem than ordinary cars.

If you do not drive the car regularly you have to keep a trickle charger on the rear battery. The front one seems to be immune from issues, so just care for that like you do any car.
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post #27 of 40 (permalink) Old 12-02-2016, 06:58 PM
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FYI, ABC does not use the battery except to actuate the valves, which only happens when the engine is running, thus operating the pump, and the valve requires very little current compared to other consumers like heated seats, SBC, etc.
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post #28 of 40 (permalink) Old 12-02-2016, 11:38 PM
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I dont know if it has been mentioned before (Didn't read the entire 13 pages)

But R230 parasitic battery drain is often traced back to a bad alarm siren/controller. PN 171 820 25 26

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post #29 of 40 (permalink) Old 12-18-2016, 11:18 AM
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Also Instrument cluster plays a big role in this case that's what I'm going thru these days LOL
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post #30 of 40 (permalink) Old 09-15-2018, 03:24 PM
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Quote:
Originally Posted by ADRIAN126sec View Post
Also Instrument cluster plays a big role in this case that's what I'm going thru these days LOL
I have the same problem with my 92 500sl. It just started after I did 2 things: I put new bulbs/ and bulb holders in the dome light. I also put new batteries in the remote, which had not had worked since I bought the car 4 months ago. I have been fixing little odds and ends since then. The remote worked properly for the passenger door, but does not lock the drivers door or the trunk. I drove it once about a week ago, and the next day the battery had .5 volts. I disconnected the battery and charged it, but in the process of finding the huge drain. I am now back to trying to troubleshoot the problem. I

If the culprit is the PSE pump, will the pump be running constantly?
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