The function of Mercedes Benz W211 battery control module are:

  1. Monitors the voltages of (G1) and (G1/7)
  2. Monitors alternator voltage (terminal 61) via CAN B
  3. Controls auxiliary battery relay (K57/2)
  4. Controls consumer prioritization function
  5. Optimizes charging of auxiliary battery (G1/7)
  6. Notes emergency operation and sets fault codes (CAN communication / DTC’s)
  7. Notes emergency operation resulting in IC / MF fault message displays

The following schematic shows the Mercedes Benz W211 Dual Battery System Diagram.

Mercedes Benz W211 Dual Battery System Diagram

F30 Polyswitch fuse
F32 Front pre-fuse box
F33 Rear pre-fuse box
G1 Battery
G1/7 Auxiliary battery
G2 Alternator
K57/2 Auxiliary battery relay
M1 Starter
N82 Battery Control Module



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