DTC C1257/57: Power Supply Drive Circuit [08/2013 - ]: Description
WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
The skid control ECU (brake booster with master cylinder assembly) detects a drop in accumulator pressure according to the signals from the accumulator pressure sensor, then operates and stops the motor relay as well as the pump motor.
The skid control ECU (brake booster with master cylinder assembly) troubleshoots the built-in motor relay drive circuit, and stores this DTC when a malfunction is detected.
| DTC No. | INF Code | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C1257/57 | 361 | While accumulator pressure falls below hard pump ON pressure, the hard drive circuit does not operate for 1 second or more. | Skid control ECU (Brake booster with master cylinder assembly) |
| ↑ | 362 | When hard driving, one of the 3 built-in motor relays does not operate for 0.2 seconds or more. | ↑ |