High-voltage system
Safety regulations
Direct current of up to approx. 800 Volts is present in the high-voltage system.
Please note:
The high-voltage system may also be energised when the vehicle is parked. For example:
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When the high-voltage battery is being charged.
When auxiliary air conditioning is active.
When the 12 Volt battery is being recharged by the high-voltage battery.
Work on components of the vehicle’s high-voltage system must only be performed when the system is not energised. To achieve
this, the high-voltage system must be de-energised and the mechanic must then check that the system is de-energised. The de-
energisation procedure is performed according to the five safety rules for electrical technology.
These three work steps must be performed:
1
2
3
De-energise the system
Ensure the system cannot be reactivated
Check that no voltage is present
These two work steps are not relevant for high-voltage vehicles:
4
Ground and short-circuit vehicle
5
Cover or shield adjacent live components
Note
Alternating voltage of 25 Volts and above and direct voltage of 60 Volts and above are hazardous to human beings. It
is therefore crucial to follow the safety instructions given in the service literature and Guided Fault Finding, as well as
the warnings displayed on the vehicle.
Note
Always de-energise the system according to the test plan in the vehicle diagnostic tester. The high-voltage system
must only be de-energised and worked on by qualified staff.
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