Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Zero Point Calibration of Yaw Rate Sensor Undone (X204C)

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / Zero Point Calibration of Yaw Rate Sensor Undone (X204C)

DESCRIPTION

Code	Tester Display	Measurement Item	Trouble Area
X204C	Zero Point Calibration of Yaw Rate Sensor Undone	History of incomplete yaw rate sensor zero point calibration	Sensor installation Yaw rate and acceleration sensor (airbag sensor assembly)1 Yaw rate sensor (yaw rate and acceleration sensor)2 Skid control ECU (brake actuator assembly)

*1: for Optitron Metar Type
*2: for TFT Meter Type

PROCEDURE

1.	CHECK DTC (HEALTH CHECK)

(a) Perform the Health Check using the Techstream.

Result	Proceed to
DTCs are not output.	A
DTCs are output.	B

GO TO DIAGNOSTIC TROUBLE CODE CHART

2.	CLEAR ZERO POINT VALUE FOR YAW RATE AND ACCELERATION SENSOR

(a) Clear the zero point value for the yaw rate and acceleration sensor.

Click here

Chassis > Brake/EPB > Utility

Tester Display
Reset Memory

3.	PERFORM ZERO POINT CALIBRATION OF YAW RATE AND ACCELERATION SENSOR

(a) Perform zero point calibration of the yaw rate and acceleration sensor.

Click here

Chassis > Brake/EPB > Utility

Tester Display
Calibration

4.	CLEAR VEHICLE CONTROL HISTORY

(a) Using the Techstream, clear the Vehicle Control History.

Chassis > Brake/EPB > Utility

Tester Display
Vehicle Control History (RoB)

5.	CHECK VEHICLE CONTROL HISTORY

(a) Based on the Freeze Frame Data and interview with the customer, attempt to reproduce the conditions when the malfunction occurred.

(b) Using the Techstream, check for Vehicle Control History.

Chassis > Brake/EPB > Utility

Tester Display
Vehicle Control History (RoB)

Result	Proceed to
X204C is not output.	A
X204C is output.	B

END

6.	CHECK VEHICLE SPECIFICATION

(a) Check the combination meter assembly.

Click here

Result	Proceed to
for Optitron Meter Type	A
for TFT Meter Type	B

GO TO STEP 9

7.	CHECK AIRBAG SENSOR ASSEMBLY INSTALLATION

(a) Turn the engine switch off.

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

Click here

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.

INSTALL AIRBAG SENSOR ASSEMBLY

8.	READ VALUE USING TECHSTREAM (YAW RATE AND ACCELERATION SENSOR)

(a) Check the yaw rate and acceleration sensor (airbag sensor assembly) output value displayed on the Techstream.

Chassis > Brake/EPB > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Lateral G	Lateral G	Min.: -25.105 m/s2 Max.: 24.908 m/s2	Turning right: -25.105 to 0.000 m/s2 Turning left: 0.000 to 24.908 m/s2	During turning: Changes in proportion with lateral acceleration
Forward and Rearward G	Forward and rearward G	Min.: -25.105 m/s2 Max.: 24.908 m/s2	During deceleration: -25.105 to 0.000 m/s2 During acceleration: 0.000 to 24.908 m/s2	During acceleration/deceleration: Changes in proportion with acceleration
Yaw Rate Sensor Value	Yaw rate sensor	Min.: -128°/s Max.:127°/s	Vehicle stopped: 0°/s Turning right: -128 to 0°/s Turning left: 0 to 127°/s	-

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Lateral G

Min.: -25.105 m/s2

Max.: 24.908 m/s2

Turning right: -25.105 to 0.000 m/s2

Turning left: 0.000 to 24.908 m/s2

During turning: Changes in proportion with lateral acceleration

Forward and Rearward G

Forward and rearward G

Min.: -25.105 m/s2

Max.: 24.908 m/s2

During deceleration: -25.105 to 0.000 m/s2

During acceleration: 0.000 to 24.908 m/s2

During acceleration/deceleration: Changes in proportion with acceleration

Yaw Rate Sensor Value

Yaw rate sensor

Min.: -128°/s

Max.:127°/s

Vehicle stopped: 0°/s

Turning right: -128 to 0°/s

Turning left: 0 to 127°/s

Chassis > Brake/EPB > Data List

Tester Display
Lateral G
Forward and Rearward G
Yaw Rate Sensor Value

OK:

The yaw rate and acceleration sensor (airbag sensor assembly) output value is normal.

REPLACE BRAKE ACTUATOR ASSEMBLY

REPLACE AIRBAG SENSOR ASSEMBLY

9.	CHECK YAW RATE AND ACCELERATION SENSOR INSTALLATION

(a) Turn the engine switch off.

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

Click here

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.

INSTALL YAW RATE AND ACCELERATION SENSOR CORRECTLY

10.	READ VALUE USING TECHSTREAM (YAW RATE AND ACCELERATION SENSOR)

(a) Check the yaw rate and acceleration sensor output value displayed on the Techstream.

Chassis > Brake/EPB > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Lateral G	Lateral G	Min.: -25.105 m/s2 Max.: 24.908 m/s2	Turning right: -25.105 to 0.000 m/s2 Turning left: 0.000 to 24.908 m/s2	During turning: Changes in proportion with lateral acceleration
Forward and Rearward G	Forward and rearward G	Min.: -25.105 m/s2 Max.: 24.908 m/s2	During deceleration: -25.105 to 0.000 m/s2 During acceleration: 0.000 to 24.908 m/s2	During acceleration/deceleration: Changes in proportion with acceleration
Yaw Rate Sensor Value	Yaw rate sensor	Min.: -128°/s Max.:127°/s	Vehicle stopped: 0°/s Turning right: -128 to 0°/s Turning left: 0 to 127°/s	-

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Lateral G

Min.: -25.105 m/s2

Max.: 24.908 m/s2

Turning right: -25.105 to 0.000 m/s2

Turning left: 0.000 to 24.908 m/s2

During turning: Changes in proportion with lateral acceleration

Forward and Rearward G

Forward and rearward G

Min.: -25.105 m/s2

Max.: 24.908 m/s2

During deceleration: -25.105 to 0.000 m/s2

During acceleration: 0.000 to 24.908 m/s2

During acceleration/deceleration: Changes in proportion with acceleration

Yaw Rate Sensor Value

Yaw rate sensor

Min.: -128°/s

Max.:127°/s

Vehicle stopped: 0°/s

Turning right: -128 to 0°/s

Turning left: 0 to 127°/s

Chassis > Brake/EPB > Data List

Tester Display
Lateral G
Forward and Rearward G
Yaw Rate Sensor Value

OK:

The yaw rate and acceleration sensor output value is normal.

REPLACE BRAKE ACTUATOR ASSEMBLY

REPLACE YAW RATE AND ACCELERATION SENSOR

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