Technical information

emergency service personnel is to be assumed, a qualified electrical specialist needs to be consulted.
In case of severe accidents with the risk of damage to the high-voltage battery being present, the high-voltage battery is
automatically disconnected from the high-voltage system.
Prior to any further work on the vehicle (e.g. repair, recycling), an inspection must be carried out by suitably qualified
personnel, according to the BMW specification.
The high-voltage system is generally to be considered intrinsically safe. In the event of an airbag deployment, there are
two switch-off mechanisms in the vehicle that switch off the high-voltage system. The system is switched off by
disconnecting the safety battery terminal at the 12-volt positive terminal of the battery, as well as via a CAN message that
disconnects the voltage supply of the battery contactors in the high-voltage battery, which causes the system to switch
off. The high-voltage system (IT system) consists of two separate circuits (HV+, HV-), which are completely decoupled
from the 12 V vehicle electrical system. The electrical GND (-) has no high-voltage potential. Only the housings of the
components are connected to GND to allow potential compensation. In order to provoke electrical damage, a person
needs to be in-between the positive and the negative HV circuit. If no damaged high-voltage cables (orange-coloured
lines) or high-voltage components are touched, an electric shock cannot occur under any circumstances.
Important: The instructions described in the following are intended for use exclusively on the BMW I12.
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2 Essential information
2.1 Definition severely damaged vehicle
A vehicle is to be considered severely damaged if at least one of the following preconditions are met:
3 Rescue & Recovery
3.1 Securing the high-voltage system
The high-voltage system should be switched off by disconnecting the plug connection of the high-voltage emergency
separation point and by disconnecting the 12 V battery (negative terminal) (see emergency services card for
instructions).
In case of airbag deployment, the switch-off of the high-voltage system can be assumed. Touching high-voltage
components and high-voltage cables is to be avoided. Ground straps (potential compensation) of the high-voltage
components may not be cut through. The de-energised state can be read off from the instrument cluster (12 V battery
must still be connected).
.
3.1.1 Deactivate the high-voltage system (switch to de-energised)
The high-voltage emergency separation point and the 12 V battery are located underneath the engine compartment lid
(see emergency services card).
The high-voltage system is to be deactivated by disconnecting the plug connection of the high-voltage rescue separation
point and by disconnecting the 12 V battery (negative terminal) (see emergency services card).
High-voltage emergency separation point closed.
- Intrusions or deformation of more than 5 millimetres at the housing of the high-voltage battery
- Vehicle is completely or partially under water (for example harbour basin, river, channel system)
- Vehicle completely or partially on fire
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