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Auxiliary Battery Malfunction

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Auxiliary Battery Malfunction

 
Old 07-09-2019, 04:39 PM
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Angry Auxiliary Battery Malfunction

This message just popped up today! I had to make two stops and it occurred both times so I don't think it's intermittent. I have an appt with the dealer Thursday morning to get it replaced. Anyone with experience with this failure? Should I be ok to use the car until then?
If the battery goes belly up what happens? Would I still be able to get it to the dealer? The car is my 22018 S450. Thanks in advance for any input.
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Old 07-09-2019, 09:00 PM
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i had the same failure in my g550; the dealer replaced it under warranty. no probs since. you can drive the car. you might get a few other driver assistant systems failures; i did. they were all corrected with the new battery and everything returned to working normally.
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Old 07-10-2019, 09:08 AM
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Originally Posted by MikeAtLincoln View Post
This message just popped up today! I had to make two stops and it occurred both times so I don't think it's intermittent. I have an appt with the dealer Thursday morning to get it replaced. Anyone with experience with this failure? Should I be ok to use the car until then?
If the battery goes belly up what happens? Would I still be able to get it to the dealer? The car is my 22018 S450. Thanks in advance for any input.
Don't worry at all. The Aux battery will not stop the main functions from running. You will make it to the dealer fine, just have a few warnings on the dash, and a few systems that may go offline. Just be sure to check blind spots and pay extra attention to lanes etc, as those systems may be offline.
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Old 07-10-2019, 03:35 PM
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I had the same issue in the past month. As others have stated you will get distronic inoperable etc.

I think yours will be a capacitor and not a battery. Dealer said they switched in 2015 and if it had a battery iwould have had to pay, if capacitor it would of been covered under my CPO.
Turns out I had the battery still so had to shell out 282.
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Old 07-10-2019, 07:16 PM
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Aux battery failure

When I had my 2015 S550 I experienced the auxiliary battery failure at the start of my drive from southern Florida to RI. Made the trip fine but distronic did not work for most of the trip. That was annoying but you can still drive the car. It was fixed under warranty. Read somewhere that if you do not operate car for over a week Mercedes recommends putting on trickle charge. I do that now with my 2018 560 and 2016 GLE 400 and havenít had a battery problem since.
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Old 07-11-2019, 01:45 AM
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Originally Posted by Radman991 View Post
When I had my 2015 S550 I experienced the auxiliary battery failure at the start of my drive from southern Florida to RI. Made the trip fine but distronic did not work for most of the trip. That was annoying but you can still drive the car. It was fixed under warranty. Read somewhere that if you do not operate car for over a week Mercedes recommends putting on trickle charge. I do that now with my 2018 560 and 2016 GLE 400 and havenít had a battery problem since.
I don't think the Trickle charge will take care of both batteries. The AUX is stand alone when the car is off. You would need one for the Main Battery and one for the Aux.....
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Old 07-11-2019, 11:12 AM
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I drive the car daily so I don't think it's a charging issue.
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Old 07-11-2019, 05:27 PM
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Originally Posted by MikeAtLincoln View Post
I drive the car daily so I don't think it's a charging issue.
On average, those batteries last 3 to 5 years.
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Old 07-11-2019, 05:33 PM
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Originally Posted by Nice Ride View Post
On average, those batteries last 3 to 5 years.
I only have had the car for 18 months, so a little early for failure. The dealer replaced the battery and updated the software today. All back to normal...
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Old 07-12-2019, 05:09 PM
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Battery malfunction

I jinxed myself. Turned on ignition this morning and what pops up? Auxiliary battery malfunction! Took delivery of my car in September 2017. Made appointment for replacement under warranty Monday.
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Old 07-12-2019, 05:12 PM
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Originally Posted by Radman991 View Post
I jinxed myself. Turned on ignition this morning and what pops up? Auxiliary battery malfunction! Took delivery of my car in September 2017. Made appointment for replacement under warranty Monday.
I bought mine in Oct of 2017, maybe a bad batch of Aux Batteries???
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Old 07-14-2019, 10:29 AM
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Originally Posted by MikeAtLincoln View Post
This message just popped up today! I had to make two stops and it occurred both times so I don't think it's intermittent. I have an appt with the dealer Thursday morning to get it replaced. Anyone with experience with this failure? Should I be ok to use the car until then?
If the battery goes belly up what happens? Would I still be able to get it to the dealer? The car is my 22018 S450. Thanks in advance for any input.
Nothing major...don't worry about it. The aux battery runs the car when you use auto start/stop. When the battery goes out, you just won't have the auto start/stop feature working.

The dealer should replace it free of charge if the car is still under warranty.
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Old 07-14-2019, 10:43 AM
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Originally Posted by ansontang View Post
Nothing major...don't worry about it. The aux battery runs the car when you use auto start/stop. When the battery goes out, you just won't have the auto start/stop feature working.

The dealer should replace it free of charge if the car is still under warranty.
Other way around. The main battery is the starter battery. The aux battery powers other systems. (If the starter battery goes, it's not just auto start that doesn't work -- it's any start.)

So a failed aux battery can give you a lot of odd alerts for all kinds of systems, although none will usually prevent the car from operating.

Recent cars have a capacitor bank instead of an actual battery. This "voltage converter" is what the system calls the aux battery. They seemed to have had a batch of bad capacitors that leak and cause this problem.
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Old 07-14-2019, 11:11 PM
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Originally Posted by whoover View Post
Other way around. The main battery is the starter battery. The aux battery powers other systems. (If the starter battery goes, it's not just auto start that doesn't work -- it's any start.)

So a failed aux battery can give you a lot of odd alerts for all kinds of systems, although none will usually prevent the car from operating.

Recent cars have a capacitor bank instead of an actual battery. This "voltage converter" is what the system calls the aux battery. They seemed to have had a batch of bad capacitors that leak and cause this problem.

Ok, Who sent the Virus..... My Aux Battery just went today. Eco Start Stop Inactive, Distronic Inactive, Active headlight inactive....

So battery lasted 5 Years....
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Old 07-14-2019, 11:32 PM
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Originally Posted by Nice Ride View Post
Ok, Who sent the Virus..... My Aux Battery just went today. Eco Start Stop Inactive, Distronic Inactive, Active headlight inactive....

So battery lasted 5 Years....
Yep. Those are the odd alerts. But at least the car starts.
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