Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Vehicle Control History

• Vehicle Control History is a function that captures and stores ECU data when triggered by specific vehicle behavior.
• If the customer states that the engine stalled or will not start, it may be possible to diagnose 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.

  Click here

• 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.

HINT:

• Vehicle Control History (RoB) of the electric parking brake system can be confirmed using the same menu for the electronically controlled brake system: Chassis / Brake/EPB / Utility / Vehicle Control History (RoB)

  Click here

Brake System Control Module "A" System Internal Failure (C059704,C059746,C13CF1C,C13D41C)

DESCRIPTION The following DTCs are stored when a malfunction occurs in the skid control ECU (brake actuator assembly). DTC No. Detection Item DTC Detection Condition Trouble Area Memory N ...

Electric Parking Brake Switch Signal Compare Failure (C060962)

DESCRIPTION When the electric parking brake switch is pulled, a lock request signal is sent from the skid control ECU (brake actuator assembly) to the parking brake actuator assembly. When the electri ...

Other materials:

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Sfi System: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) (P012800,P012807)
DESCRIPTION The ECM uses the engine coolant temperature sensor, installed to the water outlet, to monitor the operation of the thermostat. DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note P012800 Coolant Thermostat (Coolant Temperature Below Thermostat ...

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Driving Support Buzzer: Inspection
INSPECTION PROCEDURE 1. INSPECT SKID CONTROL BUZZER ASSEMBLY (a) Make sure that there is no looseness in the locking part and connecting part of the connector. (b) Disconnect the skid control buzzer assembly connector. (c) Check the connector and terminals for deformation and corrosio ...