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What Is Mercedes Auxiliary Battery Malfunction?

What Is Mercedes Auxiliary Battery Malfunction
What is the Auxiliary Battery? – Every car, SUV and truck has a 12 volt battery for starting the engine. Since the mid-2000’s Mercedes has also installed a second battery. This is what they call the auxiliary battery and it’s just a smaller version of the main battery.

  • To be accurate, in a few Mercedes-Benz models it’s actually a capacitor, which is another device for storing electricity.) The auxiliary battery is a backup for the main battery.
  • It does a number of jobs depending on what model of car it’s installed in.
  • These range from powering electrical accessories like the radio/infotainment to operating the engine stop-start system.

Like the main battery, the auxiliary battery is charged when the engine is running. And just like that battery, it lasts around four to six years. When it can’t hold a charge the computer pops up that malfunction message.
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What happens if auxiliary battery malfunction?

How Does a Faulty Auxiliary Battery Affect My Vehicle’s Performance? – An auxiliary battery malfunction affects your vehicle’s performance by causing errors in the car’s electrical systems. If you have a faulty auxiliary battery, your car’s electrical components and safety features will stop working.
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What does Mercedes auxiliary battery do?

What Is An Auxiliary Battery? – Auxiliary batteries work with your main starter battery, and as a backup battery in the event the main battery becomes disabled. It prevents your vehicle’s electrical components from dropping when starting/stopping your engine and keeps your radio, GPS, and other in-vehicle electrical components turned on.
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Can you drive a Mercedes without the auxiliary battery?

Mercedes-Benz auxiliary battery function – Once you see on-board computer DTC fault it instantly pops a question in your head, can I keep using a car? Is it save to drive and so on. The main function of mercedes-benz auxiliary battery is to provide voltage to “stop start” function, so this function may not work until you solve battery malfunction.
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Do I need to replace my auxiliary battery?

Most auxiliary batteries have a lifespan of between 5 to 8 years, but it could be more or less. Nonetheless, once your auxiliary battery declines, it will put a strain on the rest of your car. You may see accessories start to fail and problems with other car functions.
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Do Mercedes batteries recharge themselves?

Modern car batteries are built to be charged and recharged over and over again. However, they won’t hold a charge indefinitely. As you drive along, your vehicle’s alternator converts mechanical energy generated by the engine to electrical power that recharges the battery.
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What is the lifespan of a Mercedes-Benz battery?

As with most cars, you can expect to get 4 to 5 years out of your Mercedes-Benz car battery. While this offers a general guideline, your battery life can be impacted by: Time: Even with regular care, time will cause your battery to wear down and stop holding its charge.
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What charges the auxiliary battery in a car?

System Conditions – Engine Running – • Contact 1 closed • Contact 2 open The primary battery is being charged by the alternator and the secondary battery is isolated from the circuit. If the system detects a low auxiliary battery voltage contact 2 will remain closed once the engine is running to enable the auxiliary battery to be fully charged by the alternator.
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What causes battery malfunction?

What Causes Car Batteries to Fail? Driving habits rather than battery defect are often the cause of battery failure. A German manufacturer of luxury cars reveals that of 400 car batteries returned under warranty, 200 are working well and have no problem.

Low charge and acid stratification are the most common causes of the apparent failure. The car manufacturer says that the problem is more common on large luxury cars offering power-hungry auxiliary options than on the more basic models.In Japan, battery failure is the largest complaint among new car owners.

The average car is only driven 13 km (8 miles) per day and mostly in a congested city. As a result, the batteries will never get fully charged and sulfation occurs. The batteries in Japanese cars are small and only provide enough power to crank the engine and perform some rudimentary functions.

North America may be shielded from these battery problems, in part because of long distance driving. Good battery performance is important because problems during the warranty period tarnish customer satisfaction. Any service requirement during that time is recorded and the number is published in trade magazines.

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This data is of great interest among prospective car buyers throughout the world. Battery malfunction is seldom caused by a factory defect; driving habits are the more common culprits. Heavy accessory power when driving short distance prevents a periodic fully saturated charge that is so important for the longevity of a lead acid battery.

According to a leading European manufacturer of car batteries, factory defects amounts to less than 7 percent.The battery remains a weak link and the breakdowns on 1.95 million vehicles six years or less are as follows:52% battery15% flat tire8% engine7% wheels7% fuel injection6% heating & cooling6% fuel systemA breakdown due to the battery remains the number one cause.

* Source ADAC 2008 for the year 2007
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