Mercedes-Benz W211 User Manual

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W211 Dual Battery System
W211 Dual Battery System
219 BCM (ACB-ICC) 11-29-02

Mercedes-Benz W211 Specifications

General

Brand	Mercedes-Benz
Model	W211
Category	Automobile
Language	English

Summary

Program Highlights

Power distribution

Overview of fuse diagrams and locations within the dual battery system.

Dual battery on-board electrical system components

Lists key components like systems battery, auxiliary battery, and control modules.

Dual battery functional description

Details normal modes, failure modes, and charging strategies for the dual battery system.

W211 Dual Battery System Function

Systems Battery (G1)

W211 Systems Battery (G1)

Location of Auxiliary Battery (G1/7)

Auxiliary Battery (G1/7)

AGM / VRLA Battery Properties

AGM / VRLA Battery Testing

Front Pre-fuse Box (F32)

Pre-fuse Box (F33)

Pre-fuse Power Distribution

Legend: Pre-fuse Block Power Distribution

Battery Control Module (N82)

Function of N82

Auxiliary Battery Relay (K57/2)

Cut-off Relay for Interruptible Loads (K75)

Normal Mode

Multi-Function Display Fault Messages

Consumer Prioritization

Emergency Mode

Auxiliary Battery Charging Mode

Dual Battery System Diagram CAN B

Dual Battery Service Tips

Normalization

Procedures for resetting vehicle systems after battery disconnection or failure.

Adding additional electric accessories

Guidelines for safely installing aftermarket electrical accessories to the vehicle.

Appendix