Hyundai Ioniq: High Voltage Battery Control System / Pre Charge Relay. Description and operation
The Power Relay Assembly (PRA) consists of the positive and negative main relays, pre-charge relay, pre-charge resistor and battery current sensor. It is located inside the battery pack assembly and controls the high voltage power circuit between the high voltage battery and inverter by the control signal of BMS ECU.

[PRA Operation Sequence]


Removal
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Be sure to read and follow the "General Safety Information and Caution" before doing any work related with the high voltage system...
Specification
Item
Specification
ContactRated Voltage (V)450Rated Current (A)20CoilOperating Voltage (V)12Resistance (Ω)40...
Other information:
Passengers should not move out of or change seats while the vehicle is moving.
A passenger who is not wearing a seat belt during a crash or emergency stop can
be thrown against the inside of the vehicle, against other occupants, or be ejected
from the vehicle...
Your vehicle is equipped with an Occupant Classification System (OCS) in the
front passenger's seat.
Main components of the Occupant Classification System
A detection device located within the front passenger seat cushion.
Electronic system to determine whether the passenger air bag systems should
be activated or deactivated...
Categories

Air bag warning labels, required by the U.S. National Highway Traffic Safety
Administration (NHTSA), are attached to alert the driver and passengers of potential
risks of the air bag system. Be sure to read all of the information about the air
bags that are installed on your vehicle in this Owners Manual.
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