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The 2014 Mercedes ML350 has a secondary battery located under the passenger seat to support the electrical systems in case the main battery fails. The auxiliary battery is crucial for preventing issues caused by power loss in the computer systems. It's advisable to regularly inspect this battery for proper voltage and corrosion. If the auxiliary battery malfunctions, you'll have to remove the front seat to access and replace it with a new one to restore the computers' functionality.
Oops! The primary battery in a 2014 ML 350 is located under the passenger seat. Meanwhile, the secondary battery is situated near the rear cargo area in the back corner on the passenger side. You'll need to take off an interior panel to reach it.
The backup battery is located in the rear section on the far right side for passengers in the corner. I just replaced it earlier today. Let's make sure everyone understands correctly!
It remains uncertain as to whether the auxiliary battery is located under the passenger's seat or in the rear storage space.
In the trunk on the right-hand side, there is a panel that you can remove. Behind this panel, about an inch towards the back, is the auxiliary battery. To replace it, you can either remove the spare tire and surrounding carpet area, or you can cut the carpet beneath the panel box and lift it up for easier access. Before starting, make sure the battery is indeed there by feeling for it inside the open panel box. You will feel two pieces that stand up, confirming that you are in the correct spot.
In the 2014 Mercedes ML350, you can find the auxiliary battery positioned underneath the seat on the passenger side.