Caution / Notice / Hint

WARNING: This page is about a different car, the 2025 Lexus NX 350h, 2024 Lexus NX 350h, 2023 Lexus NX 350h, and 2022 Lexus NX 350h. However, it is still accessible from the selected car via links, so may be relevant.

The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during battery ECU assembly removal/installation are shown below.

NECESSARY PROCEDURES AFTER PARTS REMOVED/INSTALLED/REPLACED

Replaced Part or Performed Procedure	Necessary Procedure	Effect/Inoperative Function when Necessary Procedure not Performed	Link
Replacement of battery ECU assembly	Current sensor offset learning	DTCs are stored	Refer to PROCEDURE - Step 14

WARNING:

Orange wire harnesses and connectors indicate high-voltage circuits. To prevent electric shock, always follow the procedure described in the repair information.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Refer to PRECAUTION [11/2021 - ]

To prevent electric shock, wear insulated gloves when working on wire harnesses and components of the high voltage system.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NOTE:

To prevent the key from being locked in the vehicle, make sure to enter e-latch inspection mode and enable the manual release handle before disconnecting the cable from the negative (-) auxiliary battery terminal.
Refer to INSPECTION MODE PROCEDURE [11/2021 - ]
If the battery ECU assembly has been struck or dropped, replace it.
The type of battery ECU assembly to be used varies depending on the vehicle model.
If the wrong type of battery ECU assembly is installed, the ignition switch cannot be turned on (READY).
When replacing the battery ECU assembly, always replace it with a new one.

HINT:

When the cable is disconnected / reconnected to the auxiliary battery terminal, systems temporarily stop operating. However, each system has a function that completes learning the first time the system is used.

LEARNING COMPLETES WHEN VEHICLE IS DRIVEN

Effect/Inoperative Function when Necessary Procedure not Performed	Necessary Procedure	Link
Lighting System (EXT)	Drive the vehicle straight ahead at 35 km/h (22 mph) or more for 5 seconds or more.	Refer to INITIALIZATION [11/2021 - ]
Front Camera System
Adaptive High Beam System

LEARNING COMPLETES WHEN VEHICLE IS OPERATED NORMALLY

Effect/Inoperative Function when Necessary Procedure not Performed	Necessary Procedure	Link
E-latch System Back door opener	Perform door unlock operation with door control switch or electrical key transmitter sub-assembly switch.	Refer to INITIALIZATION [11/2021 - ]
Power Back Door System	Reset back door close position	Refer to INITIALIZATION [11/2021 - ]
Air Conditioning System	After the ignition switch is turned to ON, the servo motor standard position is recognized.	-

COMPONENTS (REMOVAL)

Fig 1: Battery ECU Removal Components (1 Of 4)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Callout - Procedure		Part Name Code
1	PRECAUTION	-	See step 1	-	-
2	WHEN REPLACING BATTERY ECU ASSEMBLY	-	See step 2	-	-
3	SERVICE PLUG GRIP	G3834	-	-	-

Fig 2: Battery ECU Removal Components With Torque Specifications (2 Of 4)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Callout - Procedure		Part Name Code
4	REMOVE NO. 2 INVERTER PROTECTOR	G921F	-	-	-
5	DISCONNECT ENGINE ROOM MAIN WIRE	82111	See step 5	-	-
6	REMOVE CONNECTOR COVER ASSEMBLY	-	See step 6	-	-
7	CHECK TERMINAL VOLTAGE	-	See step 7	-	-
8	INSTALL CONNECTOR COVER ASSEMBLY	-	See step 8	-	-
9	CONNECT ENGINE ROOM MAIN WIRE	82111	See step 9	-	-
10	INSTALL NO. 2 INVERTER PROTECTOR	G921F	-	-	-

Tightening torque for "Major areas involving basic vehicle performance such as moving/turning/stopping": N*m (kgf*cm, ft.*lbf)

N*m (kgf*cm, ft.*lbf): Specified torque

Fig 3: Battery ECU Removal Components (3 Of 4)

Callout - Procedure		Part Name Code
11	NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY	899A0A	-	-	-
12	REAR DOOR SCUFF PLATE LH	67918A	-	-	-
13	NO. 3 BATTERY SERVICE COVER BOARD	58467J	-	-	-
14	REAR DOOR SCUFF PLATE RH	67917A	-	-	-
15	NO. 2 BATTERY SERVICE COVER BOARD	58466K	-	-	-
16	BATTERY SERVICE COVER BOARD	58464D	-	-	-
17	REAR SEAT CUSHION LEG SUB-ASSEMBLY	71033	-	-	-

Fig 4: Battery ECU Removal Components (4 Of 4)

Callout - Procedure		Part Name Code
18	NO. 1 HV BATTERY COVER PANEL RH	G92N4A	See step 18	-	-
19	HYBRID BATTERY HOSE ASSEMBLY	G9290A	-	-	-
20	DISCONNECT FLOOR WIRE	82161	See step 20	-	-
21	NO. 4 HV BATTERY PROTECTOR	G92PF	See step 21	-	-
22	DISCONNECT FLOOR WIRE	82161	See step 22	-	-
23	UPPER HV BATTERY COVER SUB-ASSEMBLY	-	See step 23	-	-
24	NO. 1 HV BATTERY HOSE	G929A	See step 24	-	-
25	BATTERY ECU ASSEMBLY	89890A	See step 25	-	-

BATTERY COVER LOCK STRIKER