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 transmission oil cooler 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	Integrated current value initialization Switch battery type	Stop and Start System	Refer to REGISTRATION [11/2021 - ]
Replacement of ECM	Update ECU security key	Vehicle Control History (RoB) are stored	Refer to REGISTRATION [11/2021 - ]
	Perform Vehicle Identification Number (VIN) registration	DTC is output	Refer to UPDATE ECU SECURITY KEY [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
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	Refer to REGISTRATION [11/2021 - ] for UB80E, UB80F Registration
Replacement of automatic transaxle fluid	ATF thermal degradation estimate reset	The value of the Data List item "ATF Thermal Degradation Estimate" is not estimated correctly	Refer to INITIALIZATION [11/2021 - ]

*1: Not necessary when ECM replaced with new one

WARNING:

Do not remove the reserve tank cap, radiator cap sub-assembly or radiator drain cock plug while the engine and radiator assembly are still hot. Pressurized, hot engine coolant and steam may be released and cause serious burns.

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 (-) 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.

ITEMS FOR WHICH LEARNING IS COMPLETED BY DRIVING THE VEHICLE

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 - ]

ITEMS FOR WHICH LEARNING IS COMPLETED BY OPERATING THE VEHICLE 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: Oil Cooler 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	-	-	-

NO. 2 ENGINE WIRE

ENGINE ROOM MAIN WIRE

Fig 2: Oil Cooler Removal Components (2 Of 3)

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

Fig 3: Oil Cooler Removal Components (3 Of 3)

Callout - Procedure		Part Name Code
9	DRAIN ENGINE COOLANT	-	-	See step 9	-
10	DRAIN AUTOMATIC TRANSAXLE FLUID	-	-	See step 10	-
11	OUTLET NO. 1 OIL COOLER HOSE	32942	See step 11	-	-
12	INLET NO. 1 OIL COOLER HOSE	32941	See step 12	-	-
13	NO. 1 OIL COOLER TUBE SUB-ASSEMBLY WITHOUT HOSE	32907C	See step 13	-	-
14	NO. 1 WATER BY-PASS HOSE	16261G	See step 14	-	-
15	WATER BY-PASS HOSE ASSEMBLY	16260	See step 15	-	-
16	TRANSMISSION OIL COOLER	33493A	-	-	-

*1	INLET NO. 2 OIL COOLER HOSE	*2	OUTLET NO. 2 OIL COOLER HOSE
*3	TRANSMISSION BREATHER CLAMP	-	-