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What are the reasons for the battery warning light on the Mercedes dashboard?

1 Answers

DelMadison

07/29/25 7:55pm

Common reasons for the red battery warning light on the dashboard include: Battery failure: Typically, a battery lasts 3-4 years unless driving habits are particularly poor; Battery sensor failure; Alternator failure; Rear SAM module failure; Auxiliary small battery failure; ECO auxiliary battery related relay failure; Front SAM module failure. Wiring harness or connector issues between these components: This usually causes the red battery warning light to appear intermittently. Signal transmission to the rear SAM control module: First, the battery sensor monitors the battery voltage signal and transmits this signal to the rear SAM control module. Transmission to the alternator control unit: Next, the rear SAM control module calculates the required voltage output from the alternator based on the battery voltage signal and transmits this voltage signal to the alternator control unit via the CAN bus. Control of alternator output: Third, the engine control unit then regulates the alternator output via the LIN bus.

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