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 - ]: Description
WARNING: This page is about a different car, the 2025 Lexus NX 350h, 2024 Lexus NX 350h, 2023 Lexus NX 350h, and 2022 Lexus NX 350h. However, it is still accessible from the selected car via links, so may be relevant.
The solenoid relay and solenoid valves are built into the brake actuator assembly.
The solenoid valves control the brake fluid pressure at each wheel cylinder.
When these DTCs are stored, the fail-safe function operates and the solenoid relay is turned off to prevent the solenoid valves from operating.
HINT:
- Brake pressure control solenoid "A": Solenoid SM1
- Brake pressure control solenoid "B": Solenoid SM2
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | DTC Output from | Note |
|---|---|---|---|---|---|---|
| C0597-49 | Brake System Control Module "A" Internal Electronic Failure | When the +BS terminal voltage is from 9.5 to 17.4 V and the solenoid relay is ON, the relay contact is ON and the pump motor is in a low voltage state continuously for 0.1 seconds or more. | No. 2 skid control ECU (brake actuator assembly) | Comes on | Brake/EPB |
|
| C12F6-62 | Left Front Wheel ABS Hold Solenoid / Right Front Wheel ABS Hold Solenoid Signal Compare Failure | A difference in holding solenoid (SFLH) and holding solenoid (SFRH) output accuracy continues for 0.2 seconds or more. | No. 2 skid control ECU (brake actuator assembly) | Comes on | Brake/EPB |
|
| C12F7-62 | Left Rear Wheel ABS Hold Solenoid / Right Rear Wheel ABS Hold Solenoid Signal Compare Failure | A difference in holding solenoid (SRLH) and holding solenoid (SRRH) output accuracy continues for 0.2 seconds or more. | No. 2 skid control ECU (brake actuator assembly) | Comes on | Brake/EPB |
|
| C13BF-62 | Brake Pressure Control Solenoid "A" / "B" Signal Compare Failure | A difference in master cylinder cut solenoid (SM1) and master cylinder cut solenoid (SM2) output accuracy continues for 0.2 seconds or more. | No. 2 skid control ECU (brake actuator assembly) | Comes on | Brake/EPB |
|