Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Precaution

NOTICE:

• Since the dynamic torque control AWD system may be influenced by a malfunction in other systems, be sure to check for DTCs in other systems first.
• After installing the 4WD ECU assembly or a sensor, always perform a test mode inspection and check for DTCs.
• When the 4WD ECU assembly is replaced with a known good one from another vehicle, it is necessary to perform calibration.

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  HINT:

  When replacing the 4WD ECU assembly with a new one, it is not necessary to perform calibration.

• If a CAN communication DTC is output, repair the malfunction in the communication line before troubleshooting the dynamic torque control AWD system.
• The wiring used for each communication line is a twisted pair of wires that have an equal length. Do not temporarily repair a CAN communication line with a bypass wire or equivalent.

NOTICE:

• "4WD Control Prevention Mode" is canceled when the engine switch is turned off. Therefore, when continuing the inspection after the engine switch has been turned off during inspection, it is necessary to re-enter "4WD Control Prevention Mode".
• Do not drive the vehicle while in "4WD Control Prevention Mode".

1. With the engine switch off, connect the Techstream to the DLC3.
2. Turn the engine switch on (IG), and enter the following menus: Four Wheel Drive / Utility / 4WD Control Prevention Mode.
3. Following the display on the Techstream screen, enter "4WD Control Prevention Mode".

   HINT:

   Check that the AWD test mode message is displayed on the multi-information display.

1. Turn the engine switch off, wait for 60 seconds or more, and cancel "4WD Control Prevention Mode".

   NOTICE:

   Do not turn the engine switch off within 60 seconds of entering "4WD Control Prevention Mode". If the engine switch is turned off within 60 seconds, "4WD Control Prevention Mode" will continue when the engine switch is turned on (IG) again.

   HINT:

   Check that the AWD test mode message is no longer displayed on the multi-information display.

HINT:

• "VSC/TR(A)C/4WD Control Prevention Mode" is canceled when the engine switch is turned off. When continuing the inspection after the engine switch has been turned off during inspection, re-enter "VSC/TR(A)C/4WD Control Prevention Mode".
• Do not drive the vehicle while in "VSC/TR(A)C/4WD Control Prevention Mode".
• Perform the operation within 30 seconds of turning the engine switch on (IG).
• If it cannot be confirmed that "VSC/TR(A)C/4WD Control Prevention Mode" has been entered, carry out the procedure again from step 1 after turning the engine switch off.
• Fully depress or release the brake pedal to ensure that the stop light switch changes between ON and OFF respectively.
• Fully apply or release the parking brake to ensure that the parking brake light in the combination meter assembly illuminates or turns off respectively.

1. Turn the engine switch on (IG).
2. With the parking brake applied, release and then depress the brake pedal 2 or more times consecutively, and then keep the brake pedal depressed.
3. With the brake pedal depressed, release and then apply the parking brake 2 or more times consecutively, and then keep the parking brake applied.
4. With the parking brake applied, release and then depress the brake pedal 2 or more times consecutively again.
5. Check that the AWD test mode message and TRAC OFF message are displayed on the multi-information display and that the VSC OFF indicator light is illuminated.

1. Turn the engine switch off, wait for 60 seconds or more, and cancel "VSC/TR(A)C/4WD Control Prevention Mode".

   NOTICE:

   Do not turn the engine switch off within 60 seconds of entering VSC/TR(A)C/4WD Control Prevention Mode". If the engine switch is turned off within 60 seconds, "VSC/TR(A)C/4WD Control Prevention Mode" will continue when the engine switch is turned on (IG) again.

   HINT:

   Check that the AWD test mode message and TRAC OFF message are not displayed on the multi-information display and that the VSC OFF indicator light is not illuminated.

Dynamic Torque Control Awd System

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Parts Location

PARTS LOCATION ILLUSTRATION *1 ECM *2 SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) *3 ELECTRO MAGNETIC CONTROL COUPLING SUB-ASSEMBLY - 4WD LINEAR SOLENOID *4 ENGINE ROOM RELAY BLOCK ...

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