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Checking and refilling levels
343
Energy management
WARNING
An inappropriate handling of the 48 volt bat-
tery can cause serious injuries or death.
All maintenance works involving the 48 volt
battery should only be performed by duly
qualified and trained technical sta .
Never make any changes to the 48 volt
battery.
WARNING
Make sure the 48 volt battery does not come
into contact with water or other fluids.
Liquids may cause short circuits, electrical
shocks and burns.
Troubleshooting
Valid for: Mild Hybrid vehicles
Indicator lamps and driver messages on the in-
strument cluster display or infotainment system:
48 volt battery
The indicator lamp lights up red while driving.
The following message is displayed:
Error: 48V electrical system. Stop
safely! Check the manual.
The charge level of the 48 volt battery is too
low.
Park the vehicle in a safe place.
Switch o the ignition and wait for 3 seconds.
Switch ignition back on.
The indicator lamp lights up yellow.
Leave the engine running with the vehicle
stopped until the warning lamp switches o.
Start driving when all the warning lamps have
switched o.
If the yellow warning lamp does not switch
o within 3 minutes, seek professional assis-
tance.
48 volt battery
The warning lamp lights up yellow when the
vehicle is stopped. The following message is
displayed:
Error: 48V electrical system. Do
not start driving. Check the man-
ual.
The charge level of the 48 volt battery is too
low.
Do not start driving.
Leave the engine running with the vehicle
stopped until the warning lamp switches o.
Start driving when all the warning lamps have
switched o.
If the yellow warning lamp does not switch
o within 3 minutes, seek professional assis-
tance.
Energy management
Optimisation of the starting capacity
Energy management controls the electrical
power distribution so that there is always
enough electrical power to start the engine.
If a vehicle with a conventional energy system
remains stationary for a long period of time, the
electrical devices, for example in the electronic
ignition lock, discharge the battery. Under cer-
tain circumstances, this can lead to a lack of
electrical power to start the engine.
In your vehicle, a smart energy management
system is responsible for distributing the electri-
cal energy. This clearly improves the starting
performance and service life of the battery.
The main functions incorporated in the power
management system are battery diagnosis,
residual current management and a dy-
namic power management system.
Battery diagnostics
Battery diagnostics determine the status of the
battery on an ongoing basis. The battery volt-
age, current and temperature are monitored for
this purpose. This is used to determine the bat-
tery's charge level and eciency.
345


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