Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: VSC does not Operate or VSC does not Operate Correctly

DESCRIPTION

When TRAC or VSC is operating, the skid control ECU (brake actuator assembly) blinks the slip indicator light to inform the driver that slippage occurred.

When a communication malfunction with the ECM is detected, TRAC and VSC are disabled. Also, TRAC and VSC are disabled when a DTC is stored.

When in VSC off mode, or TRAC and VSC are disabled, the multi-information display in the combination meter assembly displays the TRAC OFF message and the VSC OFF indicator light illuminates to inform the driver.

CAUTION / NOTICE / HINT

NOTICE:

If the yaw rate and acceleration sensor (airbag sensor assembly) was replaced or reinstalled, perform "Calibration". (for Optitron Meter Type)

If the yaw rate and acceleration sensor was replaced or reinstalled, perform "Calibration". (for TFT Meter Type)

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PROCEDURE

(a) Check whether the slip indicator light was illuminated when VSC did not operate.

OK:

The slip indicator light was illuminated.

HINT:

When a DTC is stored, the slip indicator light is illuminated and VSC does not operate due to the fail-safe function.

(b) Check whether the vehicle speed was 15 km/h (9 mph) or less when VSC did not operate.

OK:

The vehicle speed was 15 km/h (9 mph) or less.

HINT:

VSC does not operate when the vehicle speed is 15 km/h (9 mph) or less.

(c) Check whether the vehicle was driven straight for a few seconds at 35 km/h (22 mph) or more.

OK:

The vehicle was not driven straight for a few seconds at 35 km/h (22 mph) or more.

HINT:

When the engine switch is turned to on (IG), as steering angle sensor zero point calibration is not performed below 35 km/h (22 mph), VSC will not operate until the vehicle is driven straight for a few seconds at 35 km/h (22 mph) or more.

OK

END

NG

(a) Check that the tire of each wheel is the correct size.

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OK:

The tire of each wheel is the correct size.

NG

REPLACE THE TIRE OF EACH WHEEL WITH THE CORRECT SIZE

OK

(a) Check the combination meter assembly.

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B

GO TO STEP 5

A

(a) Check that the yaw rate and acceleration sensor (airbag sensor assembly) has been installed properly.

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OK:

The yaw rate and acceleration sensor (airbag sensor assembly) is tightened to the specified torque.

The yaw rate and acceleration sensor (airbag sensor assembly) is not installed in a tilted position.

OK

PERFORM CALIBRATION

NG

INSTALL AIRBAG SENSOR ASSEMBLY CORRECTLY

(a) Check that the yaw rate and acceleration sensor has been installed properly.

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OK:

The yaw rate and acceleration sensor is tightened to the specified torque.

The yaw rate and acceleration sensor is not installed in a tilted position.

OK

PERFORM CALIBRATION

NG

INSTALL YAW RATE AND ACCELERATION SENSOR CORRECTLY