Caution / Notice / Hint

WARNING: This page is about a different car, the 2025 Lexus NX 250, 2024 Lexus NX 250, 2023 Lexus NX 250, and 2022 Lexus NX 250. 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 flow shutting valve (No. 1 water by-pass hose) removal/installation are shown below.

*1: Also necessary after performing a tire rotation.

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 ECM	Update ECU security key	Vehicle Control History (RoB) are stored	Refer to UPDATE ECU SECURITY KEY [11/2021 - ]
	Perform Vehicle Identification Number (VIN) registration	DTC is output	Refer to REGISTRATION [11/2021 - ]
	Code registration	Engine start function	Refer to REGISTRATION [11/2021 - ]
Replacement of ECM (If transaxle compensation code read from ECM)	Perform reset memory*1 Transfer transaxle compensation code Perform road test to allow ECM to learn	Large shift shock Deterioration of fuel efficiency	Refer to INITIALIZATION [11/2021 - ] for UB80E, UB80F Initialization Refer to REGISTRATION [11/2021 - ] for UB80E, UB80F Registration
Replacement of ECM (If transaxle compensation code not read from ECM)	Perform reset memory*1 Reset transaxle compensation code Perform road test to allow ECM to learn	Large shift shock Deterioration of fuel efficiency
Tires	Initialization23 Tire Position Identification23	Tire Pressure Warning System	Refer to Procedures Necessary When Replacing Parts (for Tire Pressure Warning System) Refer to WORK PROCEDURE [11/2021 - 03/2023] , or refer to WORK PROCEDURE [03/2023 - 03/2024] , or refer to WORK PROCEDURE [03/2024 - ]
	Rear television camera assembly optical axis (Back camera position setting)*4	Parking Assist Monitor System	Refer to CALIBRATION [11/2021 - 03/2024] , or refer to CALIBRATION [03/2024 - ]
	Parking assist ECU initialization*4	Panoramic View Monitor System	Refer to CALIBRATION [11/2021 - 03/2024] , or refer to CALIBRATION [03/2024 - ]

*1: Not necessary when ECM replaced with new one

*2: Also necessary after performing a tire rotation.

*3: It is not necessary to perform this procedure if the tire pressure warning valve and transmitters are installed to the same location.

*4 The vehicle height changes because of tire replacement.

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 (-) battery terminal.

Refer to INSPECTION MODE PROCEDURE [11/2021 - ]

HINT:

When the cable is disconnected / reconnected to the 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 15 km/h (10 mph) or more for 1 second or more.	Refer to INITIALIZATION [11/2021 - ]
Front Camera System
Adaptive High Beam System
Stop and Start System	Idle the engine for approximately 5 to 60 minutes or drive the vehicle until stop and start control is permitted.	Refer to PRECAUTION [11/2021 - 03/2023] , or refer to PRECAUTION [03/2023 - 03/2024] , or refer to PRECAUTION [03/2024 - ]

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: Flow Shutting Valve (For ATF) Removal Components (1 Of 3)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Callout - Procedure		Part Name Code
1	BATTERY	28800	-	-	-
2	ECM	89661	-	-	-
3	BATTERY CLAMP SUB-ASSEMBLY	74404B	-	-	-

Fig 2: Flow Shutting Valve (For ATF) Removal Components (2 Of 3)

Callout - Procedure		Part Name Code
4	FRONT WHEEL LH	-	-	-	-
5	FRONT FENDER FRONT SPLASH SHIELD RH	53895B	-	-	-
6	FRONT FENDER FRONT SPLASH SHIELD LH	53896B	-	-	-
7	NO. 1 ENGINE UNDER COVER	51441	-	-	-
8	NO. 2 ENGINE UNDER COVER ASSEMBLY	51420	-	-	-
9	FRONT FENDER APRON SEAL LH	53737D	-	-	-
10	DRAIN ENGINE COOLANT	-	-	See step 10	-

Fig 3: Flow Shutting Valve (For ATF) Removal Components (3 Of 3)

Callout - Procedure		Part Name Code
11	FLOW SHUTTING VALVE (NO. 1 WATER BY-PASS HOSE)	16261G	See step 11	-	-

TRANSMISSION BREATHER CLAMP

HOSE CLAMP