Caution / Notice / Hint

WARNING: This page is about a different car, the 2025 Lexus NX 350, 2024 Lexus NX 350, 2023 Lexus NX 350, and 2022 Lexus NX 350. 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 ECM 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 ECM	Perform Vehicle Identification Number (VIN) registration	DTC is output	Refer to REGISTRATION [11/2021 - ]
	ECU configuration (Only necessary after replacement)	-	Refer to ECU CONFIGURATION [11/2021 - ]
	Update ECU security key	Vehicle Control History (RoB) are stored	Refer to UPDATE ECU SECURITY KEY [11/2021 - ]
	Switch Specification Information	Vehicle control history (RoB) [X263E] is stored	Refer to INITIALIZATION [11/2021 - ]
	Heavy knock history Save history Write history	-	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 UA81F Initialization Refer to REGISTRATION [11/2021 - ] for UA81F 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

*1: Not necessary when ECM replaced with new one

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: ECM Removal Components

Callout - Procedure		Part Name Code
1	PRECAUTION	-	See step 1	-	-
2	NEGATIVE BATTERY TERMINAL	-	-	-	-
3	RADIATOR UPPER AIR GUIDE PLATE	16681A	-	-	-
4	INLET AIR CLEANER ASSEMBLY	17750A	-	-	-
5	AIR CLEANER ASSEMBLY	17700	-	-	-
6	ECM	89661	See step 6	-	-
7	NO. 1 ECM BRACKET	89667E	-	-	-
8	NO. 2 ECM BRACKET	89668	-	-	-