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SL-Class (R230) 2003 -- 2012: Discussion on the SL500, SL550, SL600

BIG Red Battery warning

 
Old 02-14-2019, 07:59 PM
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BIG Red Battery warning

Hello All,
Iím a proud owner of an 08 SL550, Iíve been going through past posts and really enjoying the vast knowledge Iím absorbing here. I bought the car with the rear battery dead, I bought two trickle chargers to see if I can salvage them, unfortunately, the rear battery did not charge, once I disconnected the trickle chargers, the big red battery warning appeared. I went ahead and replace the rear battery and and also replaced fuse 71, and everything came alive, including all keyless functions, but the big red battery warning is still there, when I start the car. The starter battery has a date code of 07/2013, so I decided to replace it also, and the big red battery warning is still there 😩, the battery was fully charged before installing it. I was able to access the hidden menu and confirmed that the battery was measuring 12 volts, when the car is off, and over 14 , when I started the car.
at this point Iím thinking that itís something else that I probably cannot fix.
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Old 02-15-2019, 02:08 PM
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If the voltage at rest is only 12v, then that is the issue. It should be at least 12.5v. I had an alternator fail a few years back and replaced it with a rebuilt form Advance Auto. It works fine but the regulator is just slightly slow to kick in after starting, so every now and then, I get the battery warning, but checking voltage, it's does come up to 14v at idle. Usually, there is no need to clear any errors, but if your voltage is normal, it might be a good idea to invest in a diagnostic tool that can read all the car's systems. Of course MBZ's SDS (Star Diagnosis) is best, and a Chinese clone pre-installed on a used laptop can be bought for around $500. Other options are the Autel MD802 Elite, and the iCarsoft MBII or i980.
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Old 02-15-2019, 03:00 PM
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Originally Posted by Alhaji Samura View Post
...once I disconnected the trickle chargers, the big red battery warning appeared.
It seems to me a momentary electrical anomaly set a fault in the Battery Control Module (BCM). If you want the red battery symbol cleared take the car to an independent shop that is equipped with Star Diagnosis to have the BCM code reset. Or better yet, spend $300 on you own Star Diagnosis from aliexpress.com.

Originally Posted by Alhaji Samura View Post
I was able to access the hidden menu and confirmed that the battery was measuring 12 volts...
Technically you are relating that the voltage is somewhere between 11.5 and just under12.5 volts. That's much too vague, of course, but it's also immaterial in this case.
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Old 02-15-2019, 06:49 PM
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I believe that my batteryís voltage was registering 12+ at idle, and 14+, when the car is started. I can get the exact number, I just thought when I see 12 & 14, that whatís count.

I believe that i messed up my batteryís fuse when I plugged in an antique trickle charger to the front starter battery. The rear battery is good because I used a modern trickle charger. Thatís why even though I ended up replacing the the starter battery, the warning is still there.

I never had the red warning light till I finished trickle charging.

I believe that itís the fuse underneath the passenger footwell, but I donít think Iíll be able to access it. I just wish someone here will be able to do it for me 😀. I also donít think I will be able to talk my local mechanic into doing it, heís already skeptic about the car, I had to talk him into doing the oil change and rear battery.

Thanks...
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Old 02-15-2019, 07:03 PM
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Update:
Just messaged my mechanic, he has the Star Diagnostics for Mercedes, Iíll going there tomorrow morning.
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Old 02-17-2019, 05:32 PM
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battery red light

Let us know how this turns out!

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Old 02-17-2019, 06:19 PM
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Originally Posted by moretech View Post
Let us know how this turns out!

moretech
My mechanic was unable to clear the code, he was able to clear the tire pressure monitoring but not the battery. I also noticed that the device he connected to the car was branded ďSnap-OnĒ I donít know if that makes a difference. At this point, Iím leaning towards the fuse underneath the passenger footwell. Now The problem is finding someone to do it for me...
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Old 02-19-2019, 12:44 PM
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Originally Posted by Alhaji Samura View Post
At this point, I’m leaning towards the fuse underneath the passenger footwell.
I believe you can test that premise by disconnecting the battery in the trunk, turning the ignition on, and within 30 seconds checking to see if you can adjust the steering wheel or seats with the doors closed. If those features work, the fuse is good.

Last edited by bobterry99; 02-19-2019 at 12:51 PM.
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Old 02-19-2019, 01:37 PM
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Originally Posted by bobterry99 View Post
I believe you can test that premise by disconnecting the battery in the trunk, turning the ignition on, and within 30 seconds checking to see if you can adjust the steering wheel or seats with the doors closed. If those features work, the fuse is good.
Hmmm? Your response in my email is different from what Iím reading on the forum? Did you edit your response? This is what I saw: I believe you can test that premise by turning the ignition on and then waiting one minute to engage the starter. I believe if the fuse in the passenger footwell is blown nothing will happen when you turn the key.
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Old 02-21-2019, 12:42 PM
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Red Batttery issue

I had the same issue after replacing my rear battery. I purchased the iCarsoft MBII and it read and cleared the fault. Take Rudeney's advice and buy something to read and clear faults, it is the only way to keep your sanity.

OP
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Old 02-21-2019, 01:10 PM
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Originally Posted by OctaviusPrime View Post
I had the same issue after replacing my rear battery. I purchased the iCarsoft MBII and it read and cleared the fault. Take Rudeney's advice and buy something to read and clear faults, it is the only way to keep your sanity.

OP
Thanks!
Do you have a link to purchase iCarsoft MBII for cheap?
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Old 02-21-2019, 01:28 PM
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Found these two...
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Old 02-21-2019, 01:36 PM
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Amazon

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Old 02-21-2019, 01:37 PM
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Click on amazon box above
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Old 02-21-2019, 01:47 PM
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Originally Posted by OctaviusPrime View Post
Click on amazon box above
Done!
Hopefully, itís easy to use😀

Thanks...

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Old 02-21-2019, 04:03 PM
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Originally Posted by Alhaji Samura View Post
Did you edit your response?
If you look at the very bottom of my post you will see where it reads:
Last edited by bobterry99; 02-19-2019 at 12:51 PM.
So yes, my post is edited.

The iCarsoft device you just ordered has perhaps 30% the capability of the diagnostic component of Star Diagnosis. I'd consider returning it.

Last edited by bobterry99; 02-21-2019 at 04:19 PM.
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Old 02-21-2019, 04:22 PM
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Originally Posted by bobterry99 View Post
If you look at the very bottom of my post you will see where it reads:
Last edited by bobterry99; 02-19-2019 at 12:51 PM.
So yes, my post is edited.

The iCarsoft device you just ordered has perhaps 30% the capability of the diagnostic component of Star Diagnosis. I'd consider returning it.
Oh boy!😀
Do you have a link to that one?
I have a laptop to use, if needed...

Thanks!
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Old 02-21-2019, 04:28 PM
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Originally Posted by bobterry99 View Post
If you look at the very bottom of my post you will see where it reads:
Last edited by bobterry99; 02-19-2019 at 12:51 PM.
So yes, my post is edited.

The iCarsoft device you just ordered has perhaps 30% the capability of the diagnostic component of Star Diagnosis. I'd consider returning it.

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Old 02-21-2019, 06:48 PM
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thanks.

Last edited by kemzo; 02-21-2019 at 08:18 PM.
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Old 02-22-2019, 11:18 AM
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Originally Posted by kemzo View Post
Do you have a link to that one?
There are two options I suggest. Both involve obtaining a Dell D630 laptop (eBay has them for $50) and purchasing the remaining system components (multiplexer, cables, software pre-installed on hard disk) as a kit from aliexpress.com

A moderator named MAVA at Benzworld repeatedly makes a specific recommendation which he states has worked for himself and many others. It may take you a bit of time, but use that forum's search feature to locate that recommendation or perhaps you can send a PM to MAVA. His recommendation is about $350.

My preference is to search aliepress.com for "XENTRY" at a price between $250 and $325. There may be a handful of results. The quality of some offerings is better than others. You want to be confident you are purchasing a "multiplexer" which has brand-new relays on its circuit board, and I would be inclined to choose the cheapest one that has these.

A couple years ago a friend got a multiplexer with decades-old used relays (!), and it quickly failed...
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Old 02-25-2019, 09:38 PM
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Originally Posted by bobterry99 View Post
There are two options I suggest. Both involve obtaining a Dell D630 laptop (eBay has them for $50) and purchasing the remaining system components (multiplexer, cables, software pre-installed on hard disk) as a kit from aliexpress.com

A moderator named MAVA at Benzworld repeatedly makes a specific recommendation which he states has worked for himself and many others. It may take you a bit of time, but use that forum's search feature to locate that recommendation or perhaps you can send a PM to MAVA. His recommendation is about $350.

My preference is to search aliepress.com for "XENTRY" at a price between $250 and $325. There may be a handful of results. The quality of some offerings is better than others. You want to be confident you are purchasing a "multiplexer" which has brand-new relays on its circuit board, and I would be inclined to choose the cheapest one that has these.

A couple years ago a friend got a multiplexer with decades-old used relays (!), and it quickly failed...
Thanks!
Itís overwhelming to choose the right one, I donít think I will be able to do this 😀. I also noticed that some are packaging it with a Lenovo X230, I have it, and will prefer using it.
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Old 02-27-2019, 09:48 PM
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Update




I still have the battery warning, but Iíve noticed that most people with this warning, have on the other side of the display, ďvisit workshopĒ, mine does not display that, everything else is fully functional in the car, no difficulties in stating, even after a week of non driving. Iím currently trying to get my own star Diagnosis but itís proving difficult, due to inexperience to choose the right components. I wonder if someone around 08902 with star Diagnosis can clear it for me and in help me buy my own😀. Thatíll be great! Thanks...
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Old 02-28-2019, 10:14 AM
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From the current offerings on aliexpress.com I would buy this one. For "Color" choose "C3 with Dell hdd". It's $280.

You'll also need a Dell D630 laptop. For c. $50 you can get one with no hard drive. For memory 1GB is adequate, but it's probably worthwhile to pay a few dollars more to get 2GB.
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Old 02-28-2019, 10:39 AM
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Originally Posted by bobterry99 View Post
From the current offerings on aliexpress.com I would buy this one. For "Color" choose "C3 with Dell hdd". It's $280.

You'll also need a Dell D630 laptop. For c. $50 you can get one with no hard drive. For memory 1GB is adequate, but it's probably worthwhile to pay a few dollars more to get 2GB.
Thank you very much for all your help, I really appreciate it. My question is, am I just tied to the Dell D630? I have an unused ThinkPad X230 with 16GB Ram, 500GB SSD drive. Iíve seen some offerings paired the X230. The X230 can also be used as a tablet. I also fully understand the tried and tested methods that people go by.



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Old 02-28-2019, 11:08 AM
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Originally Posted by kemzo View Post
...am I just tied to the Dell D630?
No, because another option exists whereby the software runs on an external drive in a "Virtual Machine". All else being equal, this configuration is markedly slower. But I suppose it would work quite satisfactorily with that jazzy Thinkpad X220. I'd go for it and choose the "usb" color option from the posting I cited.
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