Seat Leon Owner's Manual page 306

All maintenance works involving the high-
5
voltage battery should only be performed
by duly qualified and trained technical
staff .
Take care when handling flammable sub-
6
stances.
In addition to a 12-volt battery, the vehicle
may be fitted with a 48-volt battery.
The works that are to be carried out on the
48 volt battery should be performed exclu-
sively by a specialised workshop with duly
qualified technical staff, trained according to
the SEAT guidelines.
Overview of the 48 volt system
The 48 volt system consists of the following
components, among others:
48-volt battery
●
Electronic power module
●
Purple 48 volt cables and connectors
●
48 volt battery warning signs
There is a hazard warning sign on the 48 volt
›››
battery Fig. 208.
WARNING
An inappropriate handling of the 48 volt
battery can cause serious injuries or death.
All maintenance works involving the 48
●
volt battery should only be performed by
duly qualified and trained technical staff .
304
Practical tips
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 flu-
ids.
Liquids may cause short circuits, electri-
●
cal shocks and burns.
Warning lamp
 It lights up
Alternator fault.
The control lamp lights up when the ignition is
switched on. It should go out when the engine
has started running.
If the control lamp lights up while driving,

the alternator is no longer charging the bat-
tery. You should immediately drive to the
nearest specialised workshop.
You should avoid using electrical equipment
that is not absolutely necessary because this
will drain the battery.
Checking the battery electrolyte
level
The electrolyte level should be checked reg-
ularly in high-mileage vehicles, in hot coun-
tries and in older batteries.
Open the bonnet and then lift the cover
●
that protects the front part of the battery
›››
in Working in the engine compart-
ment on page 292.
Check the colour display in the "magic eye"
●
on the top of the battery.
If there are air bubbles in the window, tap
●
the window gently until they disperse.
The position of the battery is shown in the
corresponding engine compartment diagram
›››
page 295.
The "magic eye" indicator, located on the top
of the battery changes colour, depending on
the charge state and electrolyte level of the
battery.
There are two different colours:
Black: correct charge status.
●
Transparent/light yellow: the battery must
●
be replaced. Contact a specialised work-
shop.