Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Fail-safe Chart

• If a malfunction is detected in the 4WD ECU assembly, the 4WD ECU assembly may stop AWD control and transfer all torque to the front wheels, or function in a such a way as to prevent damage to the system.
• If a malfunction is detected in the sensor or actuator, current to the 4WD linear solenoid of the electro magnetic control coupling sub-assembly is cut. As a result, all torque is transferred to the front wheels.
• When a malfunction is detected in the AWD system, operations related to the malfunction will be prohibited. However, if the function is operating when the fail-safe function activates, the operation may be permitted to continue temporarily to prevent sudden changes in the vehicle condition.
• When the AWD system is malfunctioning, a warning message is displayed on the multi-information display to inform the driver.

Data List / Active Test

DATA LIST / ACTIVE TEST NOTICE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faul ...

Linear Solenoid Power Supply System Malfunction (C120C)

DESCRIPTION This DTC is output by the 4WD ECU assembly if a malfunction occurs in the linear solenoid power supply system. DTC No. Detection Item DTC Detection Condition Trouble Area C120 ...

Other materials:

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Wiper And Washer System: Lost Communication with Wiper ECU LIN (B1245)
DESCRIPTION The main body ECU (multiplex network body ECU) and windshield wiper motor and link assembly communicate via LIN communication. The main body ECU (multiplex network body ECU) stores this DTC if communication becomes abnormal. DTC No. Detection Item DTC Detection Condition Trouble ...

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Rear Differential Carrier Assembly: Reassembly
REASSEMBLY CAUTION / NOTICE / HINT NOTICE: Before installation, thoroughly clean and dry each part and then apply Toyota Genuine Differential gear oil LT SAE 75W-85 GL-5 or equivalent to them. Do not use alkaline cleaner for aluminum or rubber parts and rear differential case bolts. Do not cl ...