How Do I Fix My Mercedes Auxiliary Battery Malfunction
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The Mercedes S550, for example, runs on dual batteries consisting of the main battery for starting the car, and the auxiliary battery which runs electrical functions. It's not uncommon for the auxiliary battery to malfunction in some Mercedes models.
The auxiliary battery is the secondary battery in some Mercedes models. It's the main battery's backup and is used to run the car's electrical components like lights, audio systems, and air conditioners. In some models, the auxiliary battery is only a capacitor to store electricity.
If you have a faulty auxiliary battery, your car's electrical components and safety features will stop working. This includes; Entertainment system, GPS, audio system, PDC sensors, Blind Spot Assist, and Lane Keeping Assist. The worst is that the car may fail to start or stop.
So, how do you know which auxiliary battery type you have Simple! Open your car's trunk and hood. It would be best if you located an auxiliary battery alongside some fuses when you open the trunk. You should also see a small auxiliary battery underneath the hood.
You should replace the auxiliary battery if your Mercedes starts normally, but the auxiliary battery malfunction message appears on the dashboard. Also, if this warning message appears on the dashboard, your car's electrical components will fail since the auxiliary battery powers them.
The auxiliary battery supplies power to your car's entertainment system. This means you won't have an entertainment system if the auxiliary battery is faulty. The battery also powers PDC sensors. So, the radar system will be affected when the auxiliary battery malfunctions.
Last but not least, the auxiliary battery is a backup to the main battery. If the main battery fails, the auxiliary battery can start the car. It's a pity if both batteries fail because you won't be able to use the car.
You don't want to risk an auxiliary battery malfunction indicator on your dashboard. It's best to act fast by having a mechanic check it out and advise the way forward. The last thing you want is a Mercedes with stalled operations.
While there are many mechanics in the East Valley of Phoenix, not all of them are qualified to handle Mercedes auxiliary malfunction. This is why you want an Auto repair dealer specializing in Mercedes repair.
Your Mercedes-Benz C 300 auxiliary battery is located under your hood, beneath your cabin air housing. It takes no more than a minute to access. Simply pop up your hood using your hood release lever and remove the cabin air filter housing to reveal the auxiliary battery.
We always recommend taking your vehicle in to a certified technician but fixing the C300 auxiliary battery can be very easy. This process should take no more than 20 minutes for even novice mechanics who have never been under the hood before.
With your new auxiliary battery, ensure it comes in the standard 12V configuration and specific to your Mercedes-Benz C 300. A licensed technician is more than capable of providing the correct recommendation. You can expect your auxiliary battery to deteriorate over time before failing completely. On average, auxiliary batteries have a service life of up to seven years, more or less depending on usage and driving conditions.
A Mercedes-Benz auxiliary battery malfunction refers to an issue with the secondary battery system in the vehicle. This battery is responsible for powering various electrical systems in the vehicle, such as the radio, navigation system, and some comfort features when the main battery is not providing power.
Auxiliary Battery Malfunction is a common error message when the Mercedes-Benz auxiliary battery fails. Mercedes-Benz uses an aux battery to operate the transmission and critical accessories in critical situations.
We have seen Mercedes-Benz try to read the codes with a generic OBD-II scanner, but no fault codes come up. Using a generic scanner, you will not find fault codes that indicate a bad auxiliary battery since generic scanners cannot read Mercedes-Benz-specific fault codes.
Mercedes-Benz has what is known as a drive-by-wire. This means your gear-select shifter is electronically controlled. If the main battery dies, you can no longer control the shifter and place the vehicle in Park. Since there is an auxiliary battery, you can still shift to Park even if the main battery dies. This is a safety feature.
The most common location for the auxiliary battery on a Mercedes-Benz is on the left side of the dashboard. Other locations are where you will find auxiliary batteries on a Mercedes-Benz.
First, check the new auxiliary battery is charged. We had seen it happen before when the new auxiliary battery we installed was discharged. You can use a voltmeter to measure the voltage of the auxiliary battery. It should be above 12 volts.
Most models, including E Class W211 S211 W212 S212 C207 A207 ML W166 GL X166 C class W204 S204 S class W220 W221 A-class W176 W177 CLA W117 CLS W218 C257 Sprinter W906 Vito W639 W447 B Class W246 W247 G Class W463 G500 G55 G63 AMG cars, have the small auxiliary battery.
Typically a secondary battery may be used to power several electronic consumers. Simultaneously, an auxiliary battery is mainly used as a backup to operate the electronic shifter if the main battery fails. Whether your Mercedes-Benz has a secondary or aux battery depends on the car model and year.
N000000004039 A000000004039 12V 1.2Ah lead-acid battery is the second model of the auxiliary battery, also known as the backup battery. It is used on many models, including Mercedes SUVs such as GL X164 GL450 GL550 GL350 GL320 S-class W220 W221 S320 CL-class W216 CL550 CL600 CL63, R-class W251 R350, ML-class W164 ML250 ML300 ML350, etc.
The Mercedes auxiliary battery malfunction usually pops up when the battery dies, and you can fix it with a simple replacement. While this is the issue 9 times out of 10, the other 10 percent gets frustrating fast.
The auxiliary battery, also known as the secondary battery or backup battery, is usually an AGM battery that provides power if the main battery is low on juice. It may also power electrical accessories, such as radio or infotainment features.
Just keep in mind that if your main battery dies, your car will not start. If your auxiliary battery dies, your car should start and pop the error code up on the dash, but that might be the extent of it.
If budget is a major deciding factor, consider that auxiliary battery replacement runs anywhere from $250 to $450 at the dealership or your local mechanic. A DIY replacement only runs the cost of the battery, which ranges from $30 to $95.
The voltage capacitor issue is common in most Mercedes models complaining of an auxiliary battery function. Current C-Class, G-Class, and GLC-Class models are at the top of the list, but all may have this issue eventually.
To replace the voltage converter, make sure you have the right part for your vehicle model and year and then follow the steps to locate your auxiliary battery. The voltage converter is usually only held on by a few small tabs, and you then reverse the process to install.
To fix the Mercedes auxiliary battery malfunction, start by replacing the auxiliary battery. This solves the issue in almost every scenario, is easy to do on your own, and is something you should do every few years anyway.
Usually when voltage converter fails, you will see flashing on-board computer error fault message with the following quote \"auxiliary battery malfunction\" or \"stop vehicle shift to P leave engine running\" warning message, which constantly stays on and that creates a big question for mercedes owners - what does it mean To find out more keep reading further!
The most important thing is that we now know the issue and what to look for in the car, second thing on the priority list is to find out which auxiliary battery is fitted to your car as you will find out later by reading our blog that there are two different types of batteries.
In many new Mercedes models, the auxiliary battery is located at the top of the front passenger footwell. You will need to remove some nearby plastic mouldings and peel back the carpet to gain access to the battery area, and the fastenings can be undone with a 10mm socket. You should also disconnect the main battery before attempting the work.
Then in this case you just need to unscrew positive and negative terminals bolts, remove old N000000004039 auxiliary battery from it's original location and put new part back, once fitted auxiliary battery malfunction error code will dissapear automatically, there is no need to visit dealer shop afterwards.
For example E class W211 S211 W212 S212 C207 A207 ML W166 GL X166 C class W204 S204 S class W220 W221 A clas W176 W177 CLA W117 CLS W218 C257 Sprinter W906 Vito W639 W447 B class W246 W247 G class W463 G500 G55 G63 AMG cars have small auxiliary battery located at the luggage compartment (boot, trunk) or under the front side upper cover at driver side and it is a copy of normal size battery just \"mini\" size and few models have this battery fitted under the driver side upper panel, connected the same way as main battery with positive and negative terminals.
So the first step is to check which battery is used in your mercedes by opening a hood (bonnet) and trunk (boot), in the trunk this part is usually located nearby fuses if after inspecting these two places you weren't able to locate small auxiliary battery it means your car uses voltage converter.
For other models for example C class W205 C200 C220 C250 C300 it has also auxiliary battery but it is more like small module ballast also known as voltage converter, but it has the same purpose as other type battery - to run and power up additional accessories on the car.
N000000004039 A000000004039 12V 1.2Ah lead-acid battery is second model of the auxiliary battery also known as backup battery used for other mercedes cars such as GL X164 GL450 GL550 GL350 GL320 S-class W220 W221 S320 CL-class W216 CL550 CL600 CL63, R-class W251 R350, ML-class W164 ML250 ML300 ML350 and many other. 59ce067264