Hyundai IONIQ 5, Emergency Response Manual, Page: 7 / 22

IONIQ 5 main systems
5
High-Voltage Electrical Isolation
Unlike the 12V electrical system that is grounded to the vehicle’s chassis, the IONIQ 5’s high -
voltage electrical system is designed to be isolated from the vehicle.
Regulation of High-Voltage Electrical Current
The Power Relay Assembly (PRA) is mounted
rear side of the High-Voltage Battery Pack
Assembly and controls the high-voltage
power circuit between the High-Voltage
Battery and the Electric Power Control Unit.
High-Voltage Safety System
There are multiple safety systems
incorporated into the IONIQ 5. The system
that protects the High-Voltage Electrical
System is called the Battery Management
Unit (BMU). The BMU is located beside the
Power Relay Assembly and measures several
parameters to maintain the optimal
performance of the High-Voltage Battery. In
addition, if a system fault occurs, the BMU
turns off the PRA to protect the system.
PRA
BMU
•
Never cut or disconnect the high voltage orange cabling and connectors without first disabling
the system by removing the High voltage cut-off Switch.
•
Exposed cables or wires may be visible inside or outside the vehicle. Never touch the wires,
cables, connecters, or any electric components before disabling the system, to prevent injury or
death due to electrical shock.
Failure to follow these instructions can lead to death by electrical shock.
Electrocution Risk!