How to fix Auxiliary Battery Malfunction on Mercedes S550 w221
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- Опубліковано 28 бер 2021
- In this video I answer these questions:
What is the Auxiliary battery used for?
Why does it fail? How to replace it?
If you'd like to jump right to the answer:
0:49 What is the Auxiliary Battery used for?
1:30 Why is the "Auxiliary battery malfunction" message displayed?
2:21 How to replace the Auxiliary Battery?
This is the same repair process for all 2007 2008 2009 2010 2011 2012 and 2013 Mercedes-Benz S550 w221.
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![Changing 6 Fluids and 4 Filters to Make this Car Last Forever (hopefully) [Salvage S-Class Part 2]](http://i.ytimg.com/vi/i70M3-5XeBQ/mqdefault.jpg)
This battery does way more than just switch the transmission in an emergency. Once I replaced mine, the error message disappeared and my parking brake, parking sensors and the hold in drive feature started to work normally again. Great video!
Hello I'm getting a parking brake inoperative or operable is that what yours said
Indeed it is a "Great Video."
AWESOME video! Excellent on the detail. Keep it up. Did the one on my 2012 S550 W221 exactly the same.👍
Very thorough. Appreciate your diagnostic tips but especially the explination of the purpose of the battery as I was considering just driving it until you pointed out that if you need a tow you could be screwed
Great video! My Auxiliary Battery Malfunction light came on this morning on my 2013 S550. I figured this was the trunk battery. I'm so glad that I googled the error message and found your video. I will get a new Mercedes Auxiliary Battery and replace it myself - excellent detail with easy to follow directions. I really appreciate this.
Thank you for your video's. I learn alot from you! Nice clean job👍
Great video! Thank you for sharing your expertise with us !
Excellent detailed instructions. I have a 2011 CL500 W216 (Australia) and no where in the manual can I find there is an aux battery but, it is there!
Thank you! Just saved $350 because of your video. This was awesome.
Great video...good step by step instructions 👏🏽 👍🏽
Thank you for detail video and instruction 👍👍
thanks. worked just as you showed on a 2011 S550. Ordered battery OEM from Amazon for $47.29, and start to finish install was 45 minutes... only because I was slow and careful. You don't need a 10mm wrench... a needle nosed vise grip worked for me b/c my 10mm socket didn't fit int he space allotted. I already had a 25mm torx from years ago when I needed to remove a Mercedes door panel. I used a painter's multitool, the part with about 5/8" dull blade, to work the side panel off. As you showed, the red connector is harder to get off the old battery than the black side.
On a side not, we have had many MB... 190E, C280, E320, of the S Class, W140 x2, W220 (worst car EVER), and now W221. The 221 is the most trouble free of any car we've ever owned, with 160,000 miles and going strong.
Thank you so much
Easy to explain
Clear video
Easy to replace the battery
Thank you
Jasim .. from Kuwait
Thank God for your video. Daimler India, in our region is on a shortage, and this battery has to be ordered from Germany or Taiwan, I had one from a Robotics project, it was plug and play.
Very good! I'm here cause Humble Mechanic! Thx Jamie...
Awesome! Thank you 👊
Excellent work
Thanks, really well done video. I had this flash up the other day but it went away. I presume it just discharged as it was -23. May still replace as preemptive maintenance.
Brilliant, thank you :-)
Great video I just changed mine thank you. You are on point. Other videos I would like to see if you can upload or how to hardwire dash cam how to hardwire a radar.
UA-cam have save us so much money especially on cars, I learn to change auxiliary battery by watching videos
Avery good information
Great Video Thank you
Thank you such a good job
very good video
very well done video..5 starz
good job
Thanks mate!
I dont own a Mercedes but i am watching this
Very nice vidio !!!!!
That was pretty Good
Great video. I just changed mine using your advice. However, I was able to replace the battery without taking the bottom panel off. Thanks.
Glad it helped
Thanks for the video. It was great! Do you have any video on replacing the upper and lower control arms?
Very nice video and right to the point. Can you post link where to order factory battery from? Thank you.
I think it should be mentioned that if you remove the bottom panel (3 torx screws) it makes access much easier. Once I did that I was done in 5 minutes.
New battery. Solved.
Nice to no brother thank you 🙏
Excelent
Great video. How much different is it on a 2015 s550 w2221?
Mahalo from Hawaii
Hi Jamie I appreciate your videos and enthusiasm
I have recently picked up a 07 s550 w amg trim.I believe the starter is bad.
Would rebuilding it be a viable salution
Great video. Thank you! Can you estimate the total time it took you? Much appreciated.
thank you for the info! is the auxilary battery chargeable?
I have a Mercedes S550 2012. Is that a W221 or a W222 ? Super video !!
Hi, i didn't see whether you connected the red or black first when you put the new battery in, thanks.
Great explanation for the purpose of this battery, unfortunately I have an SL 550 and the battery is not located in this place, the “experts” have given me three places to look, under the fuse box behind the passenger seat, in the kick panel on the passenger side or under the hood again on the passanger side as far bak as you can go. I saw nothing like battery unless it’s hidden. Would you have any idea where it might be located? Any assistance would greatly be appreciated. Thank you.
I have mercedes s 350 2007 model when I start after 20mints there's come multifunction lights and speed meter up and down
Could you please tell me exactly where the Aux. Battery is located on S550 W4M, 2013 model please. Is it where this video shows?
Thank you Jamie for the video. Any idea the location will be same for C217 ?
Manufacturers tend to have a way of doing things they stick to. So just have a look.
Hey Jamie- Thanks for the video on changing the auxiliary battery on a Mercedes S550. Can I ask, what year of an S550 was that? Mine is a 2017 and there's another video floating around that showed the auxiliary battery for a 2017 S550 was in the trunk on the right side. Is this correct? And, if so, it looked like quite a bit more work to change it out. Thoughts?
Hey Jamie, if you had to buy a car after working on bmw, Mercedes, Audi, etc. Which one would you choose?
Hey Jamie, did you go to the Mercedes Elite Program?
Great content. Are there any repair manual available online for mercedes C w204 2008??
True. I have seen that video. My S550 has shown the malfunction light. Where is the battery located
IMPORTANT NOTE Later stop/start cars can have the main battery under hood/bonnet but have a bigger aux battery behind the back seat backrest. They do not have this small battery. Mine was a 2011 S350 bluetec diesel
Hey Jamie. What and where is the thermal fuse
So Jamie; my hood won't go up and my battery is dead ; can I charge my second battery or should I charge my auxiliary battery sir?
Hey how can I put my new Side markers s550 2007 can u do a video
Thanks for the great video. Can you charge the aux battery with a battery charger? or Does aux battery get charged by the alternator every time the vehicle is in drive?
If it didn't work then the battery would go flat. Because it has a BMS that should tell you logically that, yes it does get a charge from the car.
I would however suggest an additional mod to have a cable mounted so that you can get an emergency power brick to supply power. The question you have to decide is it worth the time to do this. And where would you mount the fitting? This is important for cars that stand a lot, there are three options, a solar battery trickle charger, a normal mains powered trickle charger and of course and cigarette lighter type connection with a external battery pack, you would need to decide where to cut a hole. The easiest is that under panel. And for the main battery there is a fitting we use in motor racing that makes it easy to jack a cable into the system. Never do this while the vehicle is under warranty unless you get the dealer to install prior to taking ownership and the cigarette lighter type could possibly damage the CPU if you don't have a charge controller to limit the variances in charge.
I have a 2007 CL500 W216, does the auxiliary battery have the same function?
Hi
IIn my 2013.S 550 I got a message “Battery not charging” I went to Walmart, they changed the main battery. Later the message won’t go away. The Mercedes shop told me to go to dealership to update software. The dealership advised to change the auxiliary battery. My question is, I never got auxiliary battery malfunction message, why should I change auxiliary battery. What should be my next step.
Hi, is the car under mercedes benz or mechanic programed services?
Will a bad auxiliary battery cause issues with the ISM on the transmission?
Did you remove the battery negative terminal
I am planning to buy a w221 S 500 from the year 2007. The cas has 66.000 miles on it and all the services in the Mercedes Benz dealer. It is a 14 years all car. Electric issues are like a funnel where all are battery problems. Would you recommend to buy a 2007 S500 with the services in Mercedes Benz? Thank you. Great Video!
I can tell you the normal things at that age that will deteriorate, and most are made of some type of rubber: front suspension bushings, motor mounts, transmission mount, ... basically anything made of rubber. Probably also all hoses, and possible belts. All that should be under $2,500, with the suspension being the major part of it.
Another part with rubber is the air suspension. A 2007 will likely have had at least 2 of the four corners already replaced... at a cost of about $900 per corner from an independent, about $2,200 per corner from a dealer. Our 2011 with 160k miles had one corner done at 125k miles, and another done at 145k miles.
@@larrydunn4626 thank you very much!
Hey there I replaced the battery and I’m still receiving the same error. Is there a chance that there is a fuse or something that may be blown?
Thanks Jamie, but why ain't you using impact instead of a screw driver?
It's because most people don't really have impact guns so he used normal tools that everyone would have laying around their garage
I used this video to swap my Aux battery. Thank you for that video. However, I am in need of your help again. I just replaced both my main battery and my auxiliary battery on my 2012 Mercedes s550. i am getting a error showing up on the dash stating battery not charging (in Red). Both batteries are new and fully charged.
Is there a way to reset this error?
way too late to help you but wouldn't you need an alternator replacement?
@Larry Dunn Thank you. Actually, I had to have the instrument cluster replaced and reprogrammed. So they reprogrammed a used cluster from a Mercedes dismantler.
My 2011 S550 doesn’t show a Auxiliary Malfunction on the display- i just change my main battery thought and my AC doesn’t work as strong as it did before I changed my main battery. I was told the the Auxiliary battery is also used for the AC radio etc. Do I need to change the Auxiliary battery or is there something else wrong?
If the auxiliary battery is bad, can it drain the main battery. Over night.
is this the same for a 2008 s63?
😊😊😊
On 2012 is the same?
Need the programe
Where can I find the auxiliary battery ?
hi, the same goes for my s 350 class is it possible that the sound of the radio does not work for me due to such problems? thanks
No radio sound is typically an issue with the amplifier
@@JamiesGarage1
You have an idea?
07 s550 will not start nor will the horn blow. Which battery is dead
I replaced mine with a brand new one but it still illuminates the "auxiliary battery malfunction " on the dash, thought the new battery might be bad so bought another one and same thing...can someone help please??
Guess this is for the newer model 221 .sure there's no aux battery for early moder from 07 to 09
Very good video instructions. Thank you.
I bought an aftermarket battery based only on looking at various photos and 12V 1.3ah spec as I couldn't find any information on the physical dimensions. So, taking a risk, I ordered one from Amazon.
From watching your video, and using the orientation when you put the battery next to your multi-meter, I noticed that the Positive terminal is on the left side of the battery looking from the terminal end of the battery. The one I ordered from Amazon has the terminals reversed.
WILL THERE BE ENOUGH SLAG IN THE WIRING TO ACCOMMODATE THIS SITUATION WHEN CONNECTIING THE TERMINALS?
WOULD THIS CAUSE ANY PROBLEM?
Also, perhaps if you can update your video with the exact dimensions of this Auxiliary Battery, this will help other to confidently buy an aftermarket battery.
I hope to have an answer from you before I start pulling things apart to replace the said battery.
For me I would just send the battery back to Amazon .
Do the 2007 Mercedes s550 4 matic 🤔 have one ? I need help any one I have the same problem 😪 Any can Help ?
may i know the purpose of Aux battery in vehicle
What's the part number
You should mention that this is for 2009 models and above
I saw the message (Malfunction Auxiliary Battery) on my dashboard last week while driving my 2015 S550 4Matic...called the dealer and told them that I need to pick up the auxiliary battery to do it myself - to fix the problem etc.. The dealer sold me a bigger battery than the one showing in the video. Now I am confuse/d.. How many auxiliary batteries are there? lol. I did not do anything with the battery they sold me....calling them in the AM...
your S class is not W221 as this one is. Yours is the W222.
I’m so confused. I have a 2007 S550. I thought the AUX battery was the one under the hood near the passenger side and the main battery is in the trunk behind the seat on the right side. I saw in the video another battery behind fuses. So there’s 3 batteries in this car?😮
I have a 2007 also. The start battery is under the hood. I think the aux battery is behind the rear seat. The description says this procedure is for W221 including 2007 so I don’t know what to think. Having to do major surgery for a simple anticipated service is typical German Engineering.
You say the battery is just discharged. Can you not just recharge it? Those SLA batteries are totally rechargeable.
In fact, why wouldn't the car be maintaining the charge of the battery during normal operation?
I have a 2008 S 550 4matic. My problem is that none of my remote functions work in the morning when I enter the car. This has forced me to use the physical key to enter the car or to leave the door unlocked. There is no problem with starting the car and Immediately after the car is started, the remote functions return and operate as they should. During the course of the day, the remote operates as it should, locking and unlocking, the doors and opening the trunk. After being parked for the night, the same issue resurfaces the next morning. Can anyone suggest a solution to this problem? I would appreciate any help you can provide. Thanks in advance.
Where is the aux battery on a 2016 S550?
I'm confused I thought the auxiliary was in the truck?
auxiliary battery malfunction went away and check engine light came on ?
I thought the Auxiliary battery was for ir other things as well
Will this auxiliary battery cause my car To get stuck in park please get back to me
Yes obviously
The dealer quoted me 400 USD!
I changed mine today now my car won’t start 😫
But couldn't you just connect a jump box or jumper cables to the vehicle and put the vehicle in the gear you need?
🤔
fuken to many ads in utube now lolz
stupid Mercedes, I have a 2008 with two different set of batteries, I think they switched to this setup after 2008
Question, I know this is a year old. What if your aux battery was just changed for a new one, but 50% of the time when you start her up you get that light again...then i shut it off, open the door and start it back up and the message goes away. @Jamie'sGarage
Do you you know how to unlock car when battery dies. ??? Valet key doesn't work. I don't have a battery in trunk.
How do you know this battery is bad only via the auxiliary battery warning light?