KIA Niro: Main/ Sub High Voltage Battery

Main High Voltage Battery

1. Power Relay Assembly (PRA)
2. Cell Monitoring Unit (CMU)
3. Battery Temperature Sensor
4. Runaway Arresting Device (RAD)

Warning

Main Relays (Positive, Negative), Pre-Charge Relay, Pre-Charge Resistor, and Battery Current Sensor are integrated into the PRA.

Sub High Voltage Battery

1. BMS ECU
2. Safety Plug
3. Cell Monitoring Unit (CMU)
4. Main Fuse
5. Runaway Arresting Device (RAD)
6. Battery Temperature Sensor

Warning

Main Relays (Positive, Negative), Pre-Charge Relay, Pre-Charge Resistor, and Battery Current Sensor are integrated into the PRA.

Schematic Diagram

Troubleshooting Flow

BMS ECU Terminal and Input/Output Signal

Terminal Funxtion

Connector (B11-1A)

Connector (B11-1B)

Connector (B11-2A)

Connector (B11-2B)

Sub High Voltage Battery - Removal

Warning

• Be sure to read and follow the "General Safety Information and Caution" before doing any work related with the high voltage system. Failure to follow the safety instructions may result in serious electrical injuries.
• Be sure to read and follow the "High Voltage Shut-off Procedures" before doing any work related with the high voltage system. Failure to follow the safety instructions may result in serious electrical injuries.

1. Turn ignition switch OFF and disconnect the negative (-) battery terminal.
2. Shut off the high voltage circuit.

   (Refer to Hybrid Control System - "High Voltage Shut-off Procedures")

3. Remove the sub high voltage battery rear cover (A) after loosening the mounting bolts.

High Voltage Battery Rear Cover mounting bolt : 7.8 - 11.8 N*m (0.8 - 1.2 kgf*m, 5.8 - 8.7 lb*ft)

4. Remove the sub high voltage battery cover (A) after loosening the mounting bolts.

High Voltage Battery Cover mounting bolt : 7.8 - 11.8 N*m (0.8 - 1.2 kgf*m, 5.8 - 8.7 lb*ft)

5. Disconnect the BMS connector (A).
6. Remove the BMS ECU after loosening the mounting nuts (B).

BMS ECU mounting nut : 7.8 - 11.8 N*m (0.8 - 1.2 kgf*m, 5.8 - 8.7 lb*ft)

Installation

Warning

• Be sure to read and follow the "General Safety Information and Caution" before doing any work related with the high voltage system. Failure to follow the safety instructions may result in serious electrical injuries.
• Be sure to read and follow the "High Voltage Shut-off Procedures" before doing any work related with the high voltage system. Failure to follow the safety instructions may result in serious electrical injuries.

1. Install the BMS ECU in the reverse order of removal.

• Safety Plug Description and operation
• The Power Relay Assembly
• Pre-Charge Relay
• Pre-Charge Resistor
• Battery Current Sensor
• Battery Temperature Sensor

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