BMW 5 Series Owners & Service Manuals

BMW 5 Series: 24 V Electronic Power Steering

The greater weight of the engines in the G30 on vehicles with 8-cylinder engines results in a higher front axle load. This has the effect that the required power of the steering assist increases. Due to these high currents, it is necessary to increase the voltage supply of the EPS to 24 V.

An auxiliary battery, separating element and a charging unit for the auxiliary battery are required for this. These components are installed in the luggage compartment of the G30.

The charging unit monitors the state of charge and also charges the auxiliary battery using a DC/DC converter. The EPS is only supplied with 24 V once this relay has been activated. The EPS can also be operated with 12 V in the event of a fault.

Voltage supply for 24 V steering

  1. Dynamic Stability Control (DSC)
  2. Digital Motor Electronics (DME)
  3. Electronic Power Steering (EPS)
  4. Fuse for front right power distribution box
  5. Body Domain Controller (BDC)
  6. Fuse in the rear power distribution box
  7. Power Control Unit PCU 150 W
  8. Separator
  9. Auxiliary battery in the luggage compartment
  10. Fuse in the power distribution box, battery
  11. Battery
  12. Advanced Crash Safety Module (ACSM)
  13. Brake light switch
  14. Steering column switch cluster (SZL)
  15. Instrument panel (KOMBI)

Auxiliary battery with separating element

Battery and separating element

  1. Auxiliary battery in the luggage compartment
  2. Separator

Power Control Unit

150 W Power Control Unit

The Power Control Unit monitors the state of charge and also charges the auxiliary battery using a DC/DC converter.


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