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Home >> Lexus >> 2022 >> LS 500h RWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (W/ Advanced Park) - Diagnostic Codes (2 Of 5) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/ Advanced Park) >> DTC C0597-49: Brake System Control Module "A" Internal Electronic Failure; DTC C12F6-62: Left Front Wheel ABS Hold Solenoid / Right Front Wheel ABS Hold Solenoid Signal Compare Failure; DTC C12F7-62: Left Rear Wheel ABS Hold Solenoid / Right Rear Wheel ABS Hold Solenoid Signal Compare Failure; DTC C13BF-62: Brake Pressure Control Solenoid "A" / "B" Signal Compare Failure [11/2021 - 10/2023] >> Monitor Description

Monitor Description

C0597: 

  1. The No. 2 skid control ECU (brake actuator assembly) monitors the solenoid circuit and when an abnormal monitor value is detected, the MIL is illuminated and a DTC is stored.

C12F6, C12F7 and C13BF: 

  1. The No. 2 skid control ECU (brake actuator assembly) monitors the drive voltage and current of the ABS holding solenoid and master cylinder cut solenoid. Based on the monitored information, if any of the following abnormal conditions are detected, the MIL is illuminated and a DTC is stored.
    • A difference in output accuracy of the ABS holding solenoid (SFLH) and ABS holding solenoid (SFRH) is detected.
    • A difference in output accuracy of the ABS holding solenoid (SRLH) and ABS holding solenoid (SRRH) is detected.
    • A difference in output accuracy of the Master cylinder cut solenoid (SM1) and master cylinder cut solenoid (SM2) is detected.
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