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

Hyundai Ioniq (AE) 2017-2023 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..

Safety Plug. Description and operation

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...

Other information:

Hyundai Ioniq (AE) 2017-2023 Owner's Manual: LCD Display Messages

Shift to P This message is displayed if you try to turn off the vehicle with the shift lever in the N (Neutral) position. At this time, the Engine Start/Stop button turns to the ACC position (If you press the Engine Start/Stop button once more, it will turn to the ON position)...

Hyundai Ioniq (AE) 2017-2023 Owner's Manual: Low Washer Fluid, Low Fuel, Engine has overheated / Engine overheated, Check High Beam Assist (HBA) system

Low Washer Fluid (if equipped) This message is displayed if the washer fluid level in the reservoir is nearly empty. Have the washer fluid reservoir refilled. Low Fuel This message is displayed if the fuel tank is almost out of fuel. When this message is displayed, the low fuel level warning light in the cluster will come on...