Caution / Notice / Hint

WARNING: This page is about a different car, the 2025 Toyota Highlander, 2024 Toyota Highlander, and 2023 Toyota Highlander. 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 engine assembly removal/installation are shown below.

*1: Not necessary when ECM replaced with new one

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 [10/2022 - ]
	Heavy knock history Save history Write history	-	Refer to REGISTRATION [10/2022 - ]
	Code registration	Engine start function	Refer to REGISTRATION [11/2023 - ]
	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	for Initialization: Refer to INITIALIZATION [10/2022 - ] for Registration: Refer to REGISTRATION [10/2022 - ]
	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
Replacement of air fuel ratio sensor (sensor 1) Replacement of air fuel ratio sensor (sensor 2) Replacement of engine assembly Gas leak from exhaust system is repaired	Inspection after repair	Poor idle, etc. Engine start function, etc.	Refer to INITIALIZATION [10/2022 - ]
Replacement of automatic transaxle assembly	Perform reset memory Input transaxle compensation code into ECM Perform road test to allow ECM to learn	Large shift shock Deterioration of fuel efficiency	for Initialization: Refer to INITIALIZATION [10/2022 - ] for Registration: Refer to REGISTRATION [10/2022 - ]
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 [10/2022 - ]
Suspension, tires, etc.*2	Rear television camera assembly optical axis (Back camera position setting)	Parking Assist Monitor System	Refer to CALIBRATION [10/2022 - ]
	Parking assist ECU initialization	Panoramic View Monitor System	Refer to CALIBRATION [11/2023 - ]
	Perform headlight ECU sub-assembly LH initialization	Lighting System (EXT) (w/ AFS)	Refer to INITIALIZATION [11/2023 - ]
Wheel alignment adjustment	Perform "Reset Memory". Perform "Calibration".	DTCs are stored ABS warning light illuminates Slip indicator light illuminates VSC disabled or malfunctions	Refer to UTILITY [11/2023 - ]
Replacement of front bumper assembly*	Front television camera view adjustment	Panoramic View Monitor System	Refer to CALIBRATION [11/2023 - ]

*: Even when not replacing the part, it is necessary to perform the specified necessary procedures after installation.

*1: Not necessary when ECM replaced with new one.

*2: The vehicle height changes because of suspension or tire replacement.

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
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 PARTS LOCATION [10/2022 - ]
Lane Control System	Perform steering sensor zero point calibration	Refer to INITIALIZATION [12/2019 - ]
Pre-collision System
Lighting System (EXT) (w/ AFS)

LEARNING COMPLETES WHEN VEHICLE IS OPERATED NORMALLY

Effect/Inoperative Function when Necessary Procedure not Performed	Necessary Procedure	Link
Power Door Lock Control System	Initialize back door lock	Refer to INITIALIZATION [11/2023 - ]
Power Back Door System	Reset back door close position	Refer to INITIALIZATION [11/2023 - ]
Air Conditioning System	After the ignition switch is turned to ON, the servo motor standard position is recognized.	-

WARNING:

To prevent burns, do not touch the engine, exhaust manifold or other high temperature components while the engine is hot.

NOTE:

After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.
Refer to BEFORE DISCONNECTING BATTERY [11/2023 - ]
This procedure includes the removal of small-head bolts. Refer to Small-Head Bolts of Basic Repair Hint to identify the small-head bolts.
Refer to PRECAUTION [11/2023 - ]