What causes the auxiliary battery failure in Mercedes-Benz vehicles?

1 Answers
DeAshlyn
07/30/25 5:33am
Causes of the failure may include a blown fuse in the auxiliary battery circuit, a faulty auxiliary battery, generator or charging system issues, or wiring harness problems. Additional information about the auxiliary battery is as follows: The auxiliary battery refers to the battery that powers the entertainment system, windows, and lighting system during startup. The auxiliary battery contains several large capacitors. It discharges to power electrical devices during the instant of vehicle ignition. If the auxiliary battery in a Mercedes-Benz fails, it requires repair at an authorized 4S dealership and cannot resolve automatically. A malfunctioning auxiliary battery indicates issues with the vehicle's main engine battery. Once the auxiliary battery fails, many functions may become inoperative, including auto start-stop, reverse parking sensors, seat heating, and HOLD function.
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