Kia Niro: High Voltage Battery System / Power Relay Assembly (PRA) Repair procedures

Kia Niro 2017 (DE HEV) Service Manual / Service Highlight / High Voltage Battery System / Power Relay Assembly (PRA) Repair procedures

Removal

•	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 shut off the high voltage before doing any work related with the high voltage system(Refer to "High Voltage Shut-off Procedure"). Failure to follow the safety instructions may result in serious electrical injuries.

1.	Shut off the high voltage circuit. (Refer to Hybrid Control System - “High Voltage Shutoff Procedure”)

2.	Remove the rear seat cushion. (Refer to Body - "Rear Seat Assembly")

3.	Remove the rear door scuff trim. (Refer to Body - "Door Scuff Trim")

4.	Remove the cooling duct. (Refer to High Voltage Battery Cooling System - "Cooling Duct")

Remove the upper frame (A) after loosening the mounting bolts and nuts.

High voltage battery system assembly upper frame mounting bolt :

19.6 - 29.4 N·m (2.0 - 3.0 kgf·m, 14.5 - 21.7 lb·ft)

High voltage battery system assembly upper frame mounting nut (M8) :

19.6 - 29.4 N·m (2.0 - 3.0 kgf·m, 14.5 - 21.7 lb·ft)

High voltage battery system assembly upper frame mounting nut (M6) :

7.8 - 11.8 N·m (0.8 - 1.2 kgf·m, 5.8 - 8.7 lb·ft)

Remove the high voltage battery rear cover (A) after loosening the mounting bolts and nuts.

High voltage battery rear cover mounting bolt / nut :

7.8 - 11.8 N·m (0.8 - 1.2 kgf·m, 5.8 - 8.7 lb·ft)

7.	Disconnect the high voltage power cable [+] (A) and high voltage cable [-] (B) after loosening the mounting bolts.

8.	Disconnect the BMS ECU extension connector (A), battery current sensor connector (B), inverter power connector [-] (C), inverter power connector [+] (D) and , PRA connector (E).

Remove the power relay connector after loosening the mounting nuts (A).

Power relay assembly mounting nut :

7.8 - 11.8 N·m (0.8 - 1.2 kgf·m, 5.8 - 8.7 lb·ft)

Installation

•	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 shut off the high voltage before doing any work related with the high voltage system(Refer to "High Voltage Shut-off Procedure"). Failure to follow the safety instructions may result in serious electrical injuries.

1.	Install the power relay assembly in the reverse order of removal.

Power Relay Assembly (PRA) Description and operation

Description 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 th ...

High Voltage Battery Control System

...

Other information:

Kia Niro (DE HEV) Owners Manual: System malfunction
When the AEB is not working properly, the AEB warning light () will illuminate and the warning message will appear for a few seconds. After the message disappears, the master warning light () will illuminate. In this case, we recommend you to have the vehicle inspected by an authori ...

Kia Niro 2017 (DE HEV) Service Manual: Description and operation
Description The high voltage battery system consists of the BMS ECU (Battery Management System ECU), Power Relay Assembly (PRA), safety plug, battery temperature sensor, and battery ambient sensor. Especially the BMS ECU controls SOC (State Of Charge), power, cell balancing, cooli ...