dealer wanted $400.00 to replace the aux batt. but your step by step tutorial , I did it myself that battery box was crazy putting it back but I am up and running no dashboard lights for problems thanks for your taking the x out to show us beginners how to do this my S550 2014 is running like a charm.
Thank you so much for your comment. I am so glad more and more people are using my videos to do work in their own cars. Great man, great job. They make believe it’s difficult to work on Mercedes, but it’s not.
Thank you for this tutorial. Just replaced my aux battery in 2017 S550. Everything went very smooth, although battery box wasn't fun getting back into place...crazy engineers 😂
Thanks so much Jose. My Stop/Start stopped working. So to test it, I connected a trickle charger to the posts under the hood overnight. The next day, the Stop/Start function worked. But only for a day or two. I then connected the charger again, just to be sure, and like the last time, the Stop/Start function worked. But for some reason, I attributed this problem to the Aux battery, not the main battery. I came to your channel hoping to learn how to change the Aux battery and was very impressed with how easy it was and your detailed info on how to change it. Then right there at the end, you mentioned your stop/start issues and you fixed that by changing the main battery. Well, I bought a battery but noticed in your comments someone said the new battery needs to be coded? with a scan tool? Explain please. And again. Great job and thank you.
Thank you so much for your comment. The auxiliary battery does not need to be registered, only the main battery. The car keeps a count of how long the main battery has been in use, and charges it harder and harder as time goes by. When you register the battery in the vehicle (reset the count) that number starts in 0 and the charging system charges the battery softly. To register the battery you need a xentry computer. If you are in NJ I can help. Check if your batteries are older than 2 or 3 years, if they are I would change them. The warranty on them from the dealer, if that is where you got them, is only two years. If you get the one I got from FCP they give you lifetime warranty.
@@josecitomarin LOL I installed the new Main battery this morning ( Before seeing your reply ) And the Stop/Start function has been working fine all day. I'm up in Ontario Canada so I won't be coming your way for a few months. But I will talk to my mechanic about (Resetting) Thanks again man.
@@michaelallen1359 great! I’m glad is working. It makes a lot of sense for the main battery not to be working. As I mentioned in my video, it is not always the auxiliary battery when you start/stop button doesn’t work. If the computer knows that the car won’t start again, it won’t automatically shut it off. What battery did you use? Hopefully your mechanic can restart the count for you.
2016 S550 4matic First, thank you so much for the detail video. Appreciate you taking out the time to explain it in depth. I was driving the other day and on my dashboard cluster it said, vehicle leave car running in yellow. Also, it said auxiliary battery malfunction. I just purchased the battery today and going to attempt to change it out. I haven’t noticed any of the electronics not working properly except the passenger seat won’t slide all the way back, but the reclining aspect of the seat works fully as well as everything else on the seat
Thank you so much for your comment. Also check your main battery to see how old it is. If it’s more than 2 years old I would think about changing it. It’s better to prevent any problems.
I'm reviewing this tutorial to assist with my parent's S550. What a RIDICULOUSLY COMPLEX routine just to check a battery!!! How in the world do you people think Mercedes builds a good car??? No wonder the depreciation is horrendous on these things!!
Thank you so much for your comment. I actually like the engineering of it. Many cars now have the battery in the trunk from different brands. It’s worst when is under the seat, that is really bad. When you have to change the battery under the hood, in most cases it’s a dirty job. Not if it’s in the trunk. They do depreciate super fast. But it’s good for people like me that get them used and do our own maintenance. Good luck with your parents car. Let me know if you need any more help with it.
Great video I just got a notice on a 2018 s560 about auxilliary battery i'm guessing it just needs to be changed. They really make that thing hard to get to lol.
@@josecitomarin Great i'm going to try this myself not sure how much mechanics charge for this swap. I was wondering do you need to disconnect the main battery when doing this? Also was wondering on a side note I have been having an issue where the trunk no longer opens all the way automatically... is this related to the auxillary battery? The only other symptom i've noticed aside from the dash notification is that occasionally all the parking sensor lights will beep briefly.
@@Dnasty1 no need to disconnect the main battery. Just keep in mind the precautions I mention in my video with the rags. With the trunk you just may have to reset the height. You may have programmed a different height by mistake. To reset just push the trunk open all the way and then press and hold the close button until you hear a beep probably 3 to 5 seconds. Try that and if not the battery replacement may do the trick.
@@josecitomarin thanks the trunk seems to have a deeper issue. It opens half way and seems to be floppy and lose when I manually raise it fully. I am hoping the battery does the trick. Just curious since you do mechanic work on this car can oil changed be done from above or is everything underneath again.
Had the command unit screen go blank yesterday on my S550 and resetting it did nothing. Also noticed that my start stop button is inconsistant when I press it to start the car where it doesn't always respond. Could it be aux battery related? Only had the car about a month so far.
Thank you so much for your comment. I would check both batteries for a charge and for the dates. If they are more than 2 years old I would definitely change them. So start there.
@@josecitomarin Do you happen to know where the date would be on the factory OEM battery? Couldn't seem to find the indicator anywhere like a normal battery.
@@philipsgarage there should be two numbers either in the negative terminal or a marking on the casing the first number is the number of the week it was manufactured and the second one is the year it was manufactured
@@josecitomarin Thank you! To my shock, it looks to be the original battery 7/14! I can hardly believe that. Definitely going to be replacing that along with the aux.
@@philipsgarage Omg. I’ve heard of many cases like that. They don’t make them like that anymore. But I’m sure that is the reason of all of your problems. Take a look at the video I made with the main battery. I didn’t put the original one. I got one from FCPEuro they have lifetime warranty. Just replaced mine now again and they have me credit for the old one. Make sure you register the new battery
Hi I have w222 model s class my car changed miles to kilometre always and radio some times loose memory mean I have to choose manually any dab Chanel if I go into tunnel You think it’s auxiliary battery
Thank you so much for your comment. You most likely have to change your auxiliary battery. But look into both while you are at it. Check the year in your main battery. I replaced both on mine.
did you have issues with it or just preventative maintenance? i just replaced the main battery after getting a code on my scan tool but the aux battery seems to be ok for for. im at 48k miles.
Ive got alot of fault codes after i changed the auxiliary battery , i even did star diagnose original mercedes and made the big battery adapt “0” but it was a quick fix, any idea whats the issue ?
Thank you so much for your comment. You are correct. And I talk about that in my video about the main battery. But since we have the main battery still connected to the car it doesn’t really make a difference, just have to be careful doing it and cover each terminal.
Thank you so much for your comment. If it makes you feel safer you should disconnect it. But as long as you take the necessary precautions you will be fine.
People online have said to replace both batteries since my car sometimes doesn't go in gear (we start it up, can't go into reverse or drive unless we restart). Does that sound right to you? I believe the main battery was changed 3 years ago but unsure about aux battery.
Thank you so much for your comment. If your main battery is 3 years old and from what I get your auxiliary battery is even older, I would change both regardless of what is happening. Now, your transmission having issues may have a lot to do with the transmission service. When was was the transmission service done? The transmission is completely electronic, so restarting the car is making the transmission restart. Take a look at my transmission service video
@@patricklee7888 great. You have to do the maintenance in the car. It’s the only way it will last long. The transmission service should be done every 60K
Actually the start stop worked and then stopped… I ran a diagnostic using Creader elite ( this scanner does not have reset softwares. It must be purchased!) and it showed up a series of errors including radar etc.. on top of that the terminal was corroded 😮. I bought both batteries at the MB dealer. Pricey but less potential headaches… I am assuming that the battery reset works for both batteries?
Thank you so much for your comment. The reset needs to be done on the main only. You can get the batteries elsewhere without any issues. You should get a scanner that does a bit more than that.
what are the functions of the aux battery? I have a 2014 w222 . Today i have a car with zero electrics. Door locks, command system non responsive. Is this the aux or main battery that needs replacement?
Hi. Thank you so much for your comment. The auxiliary battery will show a warning in the dash. The auxiliary battery control some electronics not all. It’s kind of a back up for the main battery. If your problem is in fact a battery issue, it would be the main battery. I would start there and depending on how old the auxiliary battery is, if you can just replace both while you are at it. I did both so I don’t have to deal with that later, that way I know how long my batteries have really been in the car. Make sure to check out the video on replacing the main battery and don’t forget to register the main battery. You do that with a xentry scanner. If you are in the NJ area in the USA I can help you with that. Here is the link to the main battery replacement. th-cam.com/video/hPAHBLQVegc/w-d-xo.html
Cool I need to get done a lot of work as you did but mine got 18.000 mile on it but still I’m scared after watching your videos I will start with my battery 1st I believe cuz most of the Time the car parked thanks that’s not far we could meet up sometime
Thank you so much for your comment. In my case it was the main battery, so you have to make sure because you don’t want to stay stuck without the main battery. If your main battery is over 2 years old and it’s Mercedes, it’s out of warranty. At FCPEuro parts are lifetime warranty
@josecitomarin In my Range Rover the aux battery is definitely for start-stop. I bought my S550 about a month ago and the only thing that doesn't work is the start-stop, so I figured the aux battery is why. That's when I found your video. I'm going to change both of them just to be sure since I don't know how old either of them are. Better safe than sorry. Benz is probably gonna screw me big time on the price, but we don't have good independent shops in my city. It needs to be done though. Luxury car life issues, you know!
@@carycoller3140 try to do it your self. If the main battery is going bad, the car’s computer knows that it will not turn automatically back on so it won’t stop to start again. It could also be the auxiliary because that is one of the parts it powers, but in some cases it’s not. The batteries should have the dates on them.
@@josecitomarin But, if it's the main battery, I don't have the equipment to code the battery to the car computer. Also, where would I get the proper aux battery to avoid buying the one MB sells? Can I get just any battery that's that size?
BMW & Mercedes Benz finished no more , it becomes grabbed a cheep collections from Swedish Dacia and the rest fabrications from Taiwan n Chaina with cheep silly design , no more expert designer in MB or BMW as all them been terminated.. The last quality MB was W210 & w211
Thank you so much for your comment. Those were beautiful models. Maybe the quality of cars is not as good anymore, but as long as you treat them good, they will last a very long time. If they use better materials on cars and keep building them in big cities and countries like they used to, cars would be even more expensive. So, the way I see it, it’s kind of a compromise. There is of course the planned obsolescence. No manufacture of any product anywhere want their products to last forever.
dealer wanted $400.00 to replace the aux batt. but your step by step tutorial , I did it myself
that battery box was crazy putting it back but I am up and running no dashboard lights for problems thanks for your taking the x out to show us beginners how to do this my S550 2014 is running like a charm.
Thank you so much for your comment. I am so glad more and more people are using my videos to do work in their own cars. Great man, great job. They make believe it’s difficult to work on Mercedes, but it’s not.
What an awesome video Jose. One of the best (maybe the best) on this topic. Thank you.
Thank you so much. Glad you like it
Thank you for this tutorial. Just replaced my aux battery in 2017 S550. Everything went very smooth, although battery box wasn't fun getting back into place...crazy engineers 😂
Thank you so much for your comment. I’m glad it worked out for you.
Thanks so much Jose. My Stop/Start stopped working. So to test it, I connected a trickle charger to the posts under the hood overnight. The next day, the Stop/Start function worked. But only for a day or two. I then connected the charger again, just to be sure, and like the last time, the Stop/Start function worked. But for some reason, I attributed this problem to the Aux battery, not the main battery. I came to your channel hoping to learn how to change the Aux battery and was very impressed with how easy it was and your detailed info on how to change it. Then right there at the end, you mentioned your stop/start issues and you fixed that by changing the main battery. Well, I bought a battery but noticed in your comments someone said the new battery needs to be coded? with a scan tool? Explain please. And again. Great job and thank you.
Thank you so much for your comment. The auxiliary battery does not need to be registered, only the main battery. The car keeps a count of how long the main battery has been in use, and charges it harder and harder as time goes by. When you register the battery in the vehicle (reset the count) that number starts in 0 and the charging system charges the battery softly. To register the battery you need a xentry computer. If you are in NJ I can help.
Check if your batteries are older than 2 or 3 years, if they are I would change them. The warranty on them from the dealer, if that is where you got them, is only two years. If you get the one I got from FCP they give you lifetime warranty.
@@josecitomarin LOL I installed the new Main battery this morning ( Before seeing your reply ) And the Stop/Start function has been working fine all day. I'm up in Ontario Canada so I won't be coming your way for a few months. But I will talk to my mechanic about (Resetting) Thanks again man.
@@michaelallen1359 great! I’m glad is working.
It makes a lot of sense for the main battery not to be working. As I mentioned in my video, it is not always the auxiliary battery when you start/stop button doesn’t work. If the computer knows that the car won’t start again, it won’t automatically shut it off. What battery did you use? Hopefully your mechanic can restart the count for you.
2016 S550 4matic
First, thank you so much for the detail video. Appreciate you taking out the time to explain it in depth. I was driving the other day and on my dashboard cluster it said, vehicle leave car running in yellow. Also, it said auxiliary battery malfunction. I just purchased the battery today and going to attempt to change it out. I haven’t noticed any of the electronics not working properly except the passenger seat won’t slide all the way back, but the reclining aspect of the seat works fully as well as everything else on the seat
Thank you so much for your comment. Also check your main battery to see how old it is. If it’s more than 2 years old I would think about changing it. It’s better to prevent any problems.
Fantastic video and explanations. Thanks very much!
Thank you so much. Make sure you take a look at the other videos too. And if you didn’t already, please subscribe
I'm reviewing this tutorial to assist with my parent's S550. What a RIDICULOUSLY COMPLEX routine just to check a battery!!! How in the world do you people think Mercedes builds a good car??? No wonder the depreciation is horrendous on these things!!
Thank you so much for your comment. I actually like the engineering of it. Many cars now have the battery in the trunk from different brands. It’s worst when is under the seat, that is really bad. When you have to change the battery under the hood, in most cases it’s a dirty job. Not if it’s in the trunk. They do depreciate super fast. But it’s good for people like me that get them used and do our own maintenance. Good luck with your parents car. Let me know if you need any more help with it.
Many thanks
No problem. If you replace it put an odyssey battery. If it died already you definitely have problems with it and it’s time for it to go. Good luck
Great video I just got a notice on a 2018 s560 about auxilliary battery i'm guessing it just needs to be changed. They really make that thing hard to get to lol.
Thank you so much for your comment. Look bad but it’s really not
@@josecitomarin Great i'm going to try this myself not sure how much mechanics charge for this swap. I was wondering do you need to disconnect the main battery when doing this? Also was wondering on a side note I have been having an issue where the trunk no longer opens all the way automatically... is this related to the auxillary battery? The only other symptom i've noticed aside from the dash notification is that occasionally all the parking sensor lights will beep briefly.
@@Dnasty1 no need to disconnect the main battery. Just keep in mind the precautions I mention in my video with the rags.
With the trunk you just may have to reset the height. You may have programmed a different height by mistake. To reset just push the trunk open all the way and then press and hold the close button until you hear a beep probably 3 to 5 seconds.
Try that and if not the battery replacement may do the trick.
@@josecitomarin thanks the trunk seems to have a deeper issue. It opens half way and seems to be floppy and lose when I manually raise it fully. I am hoping the battery does the trick. Just curious since you do mechanic work on this car can oil changed be done from above or is everything underneath again.
@@Dnasty1 both ways. Take a look at my video with the oil change
Excellent video! I have to fix the issue on my W222. My aux battery is good.
Where is the voltage converter?
Thank you so much. Check in the trunk behind the seat
good video. thank you.
Thank you so much for your comment. No problem
Had the command unit screen go blank yesterday on my S550 and resetting it did nothing. Also noticed that my start stop button is inconsistant when I press it to start the car where it doesn't always respond. Could it be aux battery related? Only had the car about a month so far.
Thank you so much for your comment. I would check both batteries for a charge and for the dates. If they are more than 2 years old I would definitely change them. So start there.
@@josecitomarin Do you happen to know where the date would be on the factory OEM battery? Couldn't seem to find the indicator anywhere like a normal battery.
@@philipsgarage there should be two numbers either in the negative terminal or a marking on the casing the first number is the number of the week it was manufactured and the second one is the year it was manufactured
@@josecitomarin Thank you! To my shock, it looks to be the original battery 7/14! I can hardly believe that. Definitely going to be replacing that along with the aux.
@@philipsgarage Omg. I’ve heard of many cases like that. They don’t make them like that anymore. But I’m sure that is the reason of all of your problems. Take a look at the video I made with the main battery. I didn’t put the original one. I got one from FCPEuro they have lifetime warranty. Just replaced mine now again and they have me credit for the old one. Make sure you register the new battery
Hi I have w222 model s class my car changed miles to kilometre always and radio some times loose memory mean I have to choose manually any dab Chanel if I go into tunnel
You think it’s auxiliary battery
Thank you so much for your comment. You most likely have to change your auxiliary battery. But look into both while you are at it. Check the year in your main battery. I replaced both on mine.
@@josecitomarin main battery is ok but some one suggested to change both what you suggest ?
@@ipansota3832I would change the main battery if it’s older than 2 years. Otherwise change the auxiliary and see what happens
@@josecitomarin thanks 👍
@@ipansota3832 no problem
did you have issues with it or just preventative maintenance? i just replaced the main battery after getting a code on my scan tool but the aux battery seems to be ok for for. im at 48k miles.
I replaced it just because I was doing all maintenance in the car. No issues
Ive got alot of fault codes after i changed the auxiliary battery , i even did star diagnose original mercedes and made the big battery adapt “0” but it was a quick fix, any idea whats the issue ?
Are the codes related to the auxiliary battery? You probably left something loose. Go back through the procedure to see that everything is connected.
@@josecitomarin Thanks for the anwser , it came out the main battery was drained.
@@P7BOLO no problem. Glad you found the problem
José , donde puedo comprar auxiliary battery , me acaba de salir el error de la batería. Gracias
Que tal Víctor. Dale click al enlace que tengo ahí. La compañía es FCP Euro.
Should always remove negative cable first and put on last on reinstalling. I torqued mine to German torque, goodentite.
Thank you so much for your comment. You are correct. And I talk about that in my video about the main battery. But since we have the main battery still connected to the car it doesn’t really make a difference, just have to be careful doing it and cover each terminal.
One question - why didn't you disconnect the main battery before replacing this? I feel that would have made it a lot safer.
Thank you so much for your comment. If it makes you feel safer you should disconnect it. But as long as you take the necessary precautions you will be fine.
People online have said to replace both batteries since my car sometimes doesn't go in gear (we start it up, can't go into reverse or drive unless we restart). Does that sound right to you? I believe the main battery was changed 3 years ago but unsure about aux battery.
Thank you so much for your comment. If your main battery is 3 years old and from what I get your auxiliary battery is even older, I would change both regardless of what is happening. Now, your transmission having issues may have a lot to do with the transmission service. When was was the transmission service done? The transmission is completely electronic, so restarting the car is making the transmission restart. Take a look at my transmission service video
@@josecitomarin will do! We had the Mercedes maintenance plan so we followed everything to the dot
@@patricklee7888 great. You have to do the maintenance in the car. It’s the only way it will last long. The transmission service should be done every 60K
Actually the start stop worked and then stopped… I ran a diagnostic using Creader elite ( this scanner does not have reset softwares. It must be purchased!) and it showed up a series of errors including radar etc.. on top of that the terminal was corroded 😮. I bought both batteries at the MB dealer. Pricey but less potential headaches… I am assuming that the battery reset works for both batteries?
Thank you so much for your comment. The reset needs to be done on the main only. You can get the batteries elsewhere without any issues. You should get a scanner that does a bit more than that.
Thank you
Yeah I will get a better scanner after this repair… parts are a little pricey etc. this scanner charges separately for each reset.
@@TheBstegold Did you see the video on the main battery change? I used a different battery and it works great, it a very good battery.
what are the functions of the aux battery? I have a 2014 w222 . Today i have a car with zero electrics. Door locks, command system non responsive. Is this the aux or main battery that needs replacement?
Hi. Thank you so much for your comment. The auxiliary battery will show a warning in the dash. The auxiliary battery control some electronics not all. It’s kind of a back up for the main battery. If your problem is in fact a battery issue, it would be the main battery. I would start there and depending on how old the auxiliary battery is, if you can just replace both while you are at it. I did both so I don’t have to deal with that later, that way I know how long my batteries have really been in the car. Make sure to check out the video on replacing the main battery and don’t forget to register the main battery. You do that with a xentry scanner. If you are in the NJ area in the USA I can help you with that.
Here is the link to the main battery replacement.
th-cam.com/video/hPAHBLQVegc/w-d-xo.html
@@josecitomarinwhat part of NJ Sr I’m by Bay ridge Brooklyn NY
@@ilhommuminov708 I’m in south orange
Cool I need to get done a lot of work as you did but mine got 18.000 mile on it but still I’m scared after watching your videos I will start with my battery 1st I believe cuz most of the Time the car parked thanks that’s not far we could meet up sometime
@@ilhommuminov708 of course
Are you supposed to code or register the new battery with a scan tool?
Not the auxiliary battery. Just the main battery.
@@josecitomarin nice I appreciate you content very good step by step instructions.
@@ryans-d7d thank you so much
Where did you get battery?
FCP Euro
@@josecitomarin thank you
@@mag_nee_toe651 you are welcome
😎✌️
This battery must be why my start-stop isn't working. If I have to go through all this to change it I'll continue to live without start-stop.
Thank you so much for your comment. In my case it was the main battery, so you have to make sure because you don’t want to stay stuck without the main battery. If your main battery is over 2 years old and it’s Mercedes, it’s out of warranty. At FCPEuro parts are lifetime warranty
@josecitomarin In my Range Rover the aux battery is definitely for start-stop. I bought my S550 about a month ago and the only thing that doesn't work is the start-stop, so I figured the aux battery is why. That's when I found your video. I'm going to change both of them just to be sure since I don't know how old either of them are. Better safe than sorry. Benz is probably gonna screw me big time on the price, but we don't have good independent shops in my city. It needs to be done though. Luxury car life issues, you know!
@@carycoller3140 try to do it your self. If the main battery is going bad, the car’s computer knows that it will not turn automatically back on so it won’t stop to start again. It could also be the auxiliary because that is one of the parts it powers, but in some cases it’s not. The batteries should have the dates on them.
@@josecitomarin But, if it's the main battery, I don't have the equipment to code the battery to the car computer. Also, where would I get the proper aux battery to avoid buying the one MB sells? Can I get just any battery that's that size?
@@carycoller3140 where are you located?
BMW & Mercedes Benz finished no more , it becomes grabbed a cheep collections from Swedish Dacia and the rest fabrications from Taiwan n Chaina with cheep silly design , no more expert designer in MB or BMW as all them been terminated..
The last quality MB was W210 & w211
Thank you so much for your comment. Those were beautiful models.
Maybe the quality of cars is not as good anymore, but as long as you treat them good, they will last a very long time.
If they use better materials on cars and keep building them in big cities and countries like they used to, cars would be even more expensive. So, the way I see it, it’s kind of a compromise. There is of course the planned obsolescence. No manufacture of any product anywhere want their products to last forever.