Hyundai Ioniq: High Voltage Battery Control System / BMS ECU. Repair procedures

Hyundai Ioniq (AE) 2017-2025 Service Manual / Hybrid Control System / High Voltage Battery Control System / BMS ECU. Repair procedures

Removal

1.	Shut off the high voltage. (Refer to Hybrid Control System - "High Voltage Shut-off Procedures")

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

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

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

7.	Disconnect the BMS connector (A).

8.	Remove the installation nut (B), then remove the BMS.

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.

Install the BMS ECU in the reverse order of removal.

High voltage battery rear and front cover installation bolt / nut : 7.8 - 11.8 N.m (0.8 - 1.2 kgf.m, 5.8 - 8.7 lb-ft)

BMS ECU Installation nut :

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

BMS ECU. Schematic diagrams

B..

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DescriptionSafety Plug is installed on the rear side of the high voltage battery and it can mechanically shut the high voltage circuit off when servicing the high voltage system...

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