Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Vehicle Control History
VEHICLE CONTROL HISTORY
DESCRIPTION
- Vehicle Control History is a function that captures and stores ECU data when triggered by specific vehicle behavior.
- It may be possible to determine the cause of the malfunction by checking the vehicle history information and freeze frame data.
- The number of possible stored Freeze Frame Data sets, whether multi Freeze Frame Data is available, the number of freeze frame points, Freeze Frame Data items, the ECU internal range, etc., is different depending on the stored group.
-
The stored data items for Vehicle Control History Freeze Frame Data are different depending on the stored group. When the value of a data item does not change across all points, only the value of the detection point will be displayed. The contents of the Freeze Frame Data is almost the same as that of the Data List.
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PRECAUTIONS
- As Vehicle Control History may be overwritten whenever the trigger conditions are met, make sure to save Vehicle Control History before performing any inspections.
- As Vehicle Control History may be stored when performing an Active Test, learning, etc., make sure to clear the Vehicle Control History before returning the vehicle to the customer.
CHECK VEHICLE CONTROL HISTORY (VEHICLE STABILITY CONTROL SYSTEM AND ELECTRIC PARKING BRAKE SYSTEM)
(a) Turn the engine switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the engine switch on (IG).
(d) Turn the Techstream on.
(e) Enter the following menus: Chassis / Brake/EPB / Utility / Vehicle Control History (RoB).
Chassis > Brake/EPB > Utility| Tester Display |
|---|
| Vehicle Control History (RoB) |
| Code | Tester Display | Measurement Item | User Notification | Diagnostic Note |
|---|---|---|---|---|
| X204C | Zero Point Calibration of Yaw Rate Sensor Undone | History of incomplete yaw rate sensor zero point calibration |
| Refer to Zero Point Calibration of Yaw Rate Sensor Undone (X204C). |
| X2079 | Communication Error from Brake Control Module to Engine Control Module | History of being unable to send data to the ECM continuously for 2 seconds or more |
| Refer to the following diagnosis procedure:
|
| X2085 | Electric Parking Brake Control Module Malfunction | History of receiving an electric parking brake system malfunction signal continuously for 1 second or more from the skid control ECU (brake actuator assembly) | Brake hold operated indicator light blinks* | Refer to How to Proceed with Troubleshooting in Electric Parking Brake System. |
| X2086 | SRS Airbag Malfunction | History of receiving an abnormal secondary collision brake control request signal from airbag sensor assembly | - | |
| X2087 | Engine Malfunction | History of receiving an SFI system malfunction signal continuously from the ECM for 1 second or more |
| Refer to How to Proceed with Troubleshooting in SFI System. |
| X2088 | Bank Angle Detected | History of VSC operation being temporarily prohibited when driving at a steep bank angle, etc. |
| HINT: Explain that VSC operation was temporarily prohibited when driving on a road with a steep bank angle, etc. |
| X208A | Zero Point Calibration of Steering Angle Sensor Initialization Malfunction | History of being unable to obtain the steering angle zero point after driving at a vehicle speed exceeding 15 km/h (9 mph) for 0.05 seconds or more |
| Refer to the following diagnosis procedure:
|
| X208B | EPB Motor Continuous Operation Request | History of system suspended to prevent overheat of parking brake actuator assembly when electric parking brake was used repeatedly | Brake hold operated indicator light blinks* | HINT:
|
| X2096 | Pre-Collision Brake | History of pre-collision brake operation | In accordance with Pre-collision System behavior | - |
| X2098 | Pre-Collision Brake Assist | History of pre-collision brake assist operation | In accordance with Pre-collision System behavior | - |
| X20A0 | ABS | History of ABS operation | - | - |
| X20A1 | VSC | History of VSC operation | Slip indicator light blinks | - |
| X20A2 | TRC(TRAC) | History of TRAC operation | Slip indicator light blinks | - |
| X20A3 | High Power Assist Brake | History of high power assist brake operation | - | - |
| X20A4 | Booster Failure Control | History of control failure operation | Brake system warning light (red indicator) illuminates | - |
| X20A5 | Hill Start Assist | History of hill start assist operation | - | - |
| X20A7 | Brake Assist | History of brake assist operation | - | - |
| X20A8 | Secondary Collision Brake | History of secondary collision brake operation | - | - |
| X20D7 | Zero Point Calibration of Steering Angle Sensor Malfunction | History of the steering angle sensor zero point calibration position differing from the stored value |
| Refer to Zero Point Calibration of Steering Angle Sensor Malfunction (X20D7). |
| X20D8 | Zero Point Calibration of Steering Angle Sensor Not Acquired | History of being unable to obtain the steering angle zero point |
| Refer to Zero Point Calibration of Steering Angle Sensor Not Acquired (X20D8). |
| X219C | EPB Lock Control Run | History of abnormal electric parking brake operation | Brake system warning light (yellow indicator) illuminates | Refer to How to Proceed with Troubleshooting in Electric Parking Brake System. HINT: EPB: Electric Parking Brake System |
HINT:
*: When the vehicle is put into the following vehicle conditions and the brake hold switch (electric parking brake switch assembly) is turned on, the brake hold operation light blinks.
-
Conditions required for operation standby:
- The driver side door is closed.
- The driver side seat belt is fastened.
CLEAR VEHICLE CONTROL HISTORY (VEHICLE STABILITY CONTROL SYSTEM AND ELECTRIC PARKING BRAKE SYSTEM)
(a) Turn the engine switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the engine switch on (IG).
(d) Turn the Techstream on.
(e) Enter the following menus: Chassis / Brake/EPB / Utility / Vehicle Control History (RoB).
Chassis > Brake/EPB > Utility| Tester Display |
|---|
| Vehicle Control History (RoB) |
(f) Press the DTC clear button.
NOTICE:
By performing this procedure, all stored Vehicle Control History items will be cleared.
CHECK VEHICLE CONTROL HISTORY (AIRBAG SYSTEM)
HINT:
A part of the control history can be confirmed using the vehicle control history.
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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