What are the symptoms of a faulty auxiliary battery in a Mercedes-Benz S-Class?

1 Answers
DeAyla
07/29/25 7:03pm
Multiple function failures: When the auxiliary battery in a Mercedes-Benz malfunctions, it indicates a failure in the car's engine battery, which should not be taken lightly. Once the auxiliary battery fails, many functions will stop working, such as auto start-stop, reverse radar, seat heating, HOLD, etc. If the auxiliary battery in a Mercedes-Benz fails, it needs to be repaired at a 4S dealership and cannot be resolved automatically. Slow car startup: When the auxiliary battery fails, it can cause the car to start slowly, result in issues with some circuit controls or insufficient power, and may also lead to excessively low voltage in the car's battery pack, which can cause other faults. It is necessary to promptly visit an auto repair center for maintenance and replacement.
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