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48-Volt Mild Hybrid Systems: Mercedes-Benz
I-CAR · January 31, 2024 · Mercedes-Benz
Summary
This document outlines the function and safety requirements for Mercedes-Benz vehicles equipped with 48-volt mild hybrid systems. It highlights that the 48V system supports high-draw accessories and specifies that the system must be de-energized by disconnecting the 12V battery before unplugging any 48V connectors.
What to do on the job
Always disconnect the 12V battery for at least 10 seconds to de-energize the 48V system before unplugging any 48V connectors (identified by brown and purple ground lines).
How to use it
Use this document to justify the labor time required to perform a 12V battery disconnect/reconnect sequence as a mandatory safety step before servicing any electrical or structural components near the 48V system. It also helps identify 48V wiring by its distinct brown and purple coloring.
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