Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Multi-axis Acceleration Sensor Module "A" Missing Calibration (C051D54,C121054)

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / Multi-axis Acceleration Sensor Module "A" Missing Calibration (C051D54,C121054)

DESCRIPTION

for Optitron Meter Type:
  • The airbag sensor assembly has a built-in yaw rate and acceleration sensor and detects the vehicle condition.

    The skid control ECU (brake actuator assembly) receives signals from the yaw rate and acceleration sensor (airbag sensor assembly) via CAN communication.

    HINT:

    If there is a malfunction in the bus lines between the yaw rate and acceleration sensor (airbag sensor assembly) and the CAN communication system, DTCs U012587 are output. When DTCs U012587 are output together with C051D54 and/or C121054, inspect and repair the trouble areas indicated by U012587 first.

for TFT Meter Type:
  • The skid control ECU (brake actuator assembly) receives signals from the yaw rate and acceleration sensor via CAN communication.

    HINT:

    If there is a malfunction in the bus lines between the yaw rate and acceleration sensor and the CAN communication system, DTCs U012587 are output. When DTCs U012587 are output together with C051D54 and/or C121054, inspect and repair the trouble areas indicated by U012587 first.

These DTCs are also output when the calibration has not been completed.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C051D54

Multi-axis Acceleration Sensor Module "A" Missing Calibration

Zero point calibration of acceleration sensor undone.
  • Acceleration sensor zero point not calibrated
  • Acceleration sensor (airbag sensor assembly) installation (for Optitron Meter Type)
  • Acceleration sensor (yaw rate and acceleration sensor) installation (for TFT Meter Type)
  • Acceleration sensor (airbag sensor assembly) (for Optitron Meter Type)
  • Acceleration sensor (yaw rate and acceleration sensor) (for TFT Meter Type)
  • Skid control ECU (brake actuator assembly)

C121054

Yaw Rate Sensor Missing Calibration

Zero point calibration of yaw rate sensor undone.

Yaw rate sensor zero point not calibrated

CAUTION / NOTICE / HINT

NOTICE:

  • After replacing the skid control ECU (brake actuator assembly), perform "Calibration".

    Click here

  • 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)

    Click here

PROCEDURE

1.

PERFORM CALIBRATION

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Enter the following menus: Chassis / Brake/EPB / Utility / Calibration.

(d) Perform "Calibration".

Click here

Chassis > Brake/EPB > Utility

Tester Display

Calibration
NEXT

2.

CLEAR DTC

(a) Operate the Techstream to clear the codes. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.

Chassis > Brake/EPB > Clear DTCs

(b) Press the DTC clear button.

(c) Turn the engine switch off.

NEXT

3.

RECONFIRM DTC

(a) Turn the engine switch on (IG).

(b) Read the DTCs following the prompts on the Techstream. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.

Chassis > Brake/EPB > Trouble Codes

(c) Check if the same DTC is output.

Result

Proceed to

DTCs C051D54 and C121054 are not output.

A

DTCs C051D54 and/or C121054 are output.

B
A

END
B

4.

CHECK VEHICLE SPECIFICATION

(a) Check the combination meter assembly.

Click here

Result

Proceed to

for Optitron Meter Type

A

for TFT Meter Type

B
B

GO TO STEP 7

A

5.

CHECK AIRBAG SENSOR ASSEMBLY INSTALLATION

(a) 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.

NG

INSTALL AIRBAG SENSOR ASSEMBLY CORRECTLY

OK

6.

READ VALUE USING TECHSTREAM (YAW RATE AND ACCELERATION SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Enter the following menus: Chassis / Brake/EPB / Data List.

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

-
Chassis > Brake/EPB > Data List

Tester Display

Lateral G

Forward and Rearward G

Yaw Rate Sensor Value

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

OK:

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

OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPLACE AIRBAG SENSOR ASSEMBLY

7.

CHECK YAW RATE AND ACCELERATION SENSOR INSTALLATION

(a) 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.

NG

INSTALL YAW RATE AND ACCELERATION SENSOR CORRECTLY

OK

8.

READ VALUE USING TECHSTREAM (YAW RATE AND ACCELERATION SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Enter the following menus: Chassis / Brake/EPB / Data List.

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

-
Chassis > Brake/EPB > Data List

Tester Display

Lateral G

Forward and Rearward G

Yaw Rate Sensor Value

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

OK:

The yaw rate and acceleration sensor output value is normal.

OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPLACE YAW RATE AND ACCELERATION SENSOR

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