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Home >> Lexus >> 2021 >> LS 500h RWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (W/O Advanced Park) - Diagnostic Codes (2 Of 3) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Advanced Park) >> DTC C1311: Open Circuit in Main Relay 1; DTC C1312: Short Circuit in Main Relay 1; DTC C1313: Open Circuit in Main Relay 2; DTC C1314: Short Circuit in Main Relay 2 [10/2020 - 10/2023] >> Typical Enabling Conditions

Typical Enabling Conditions

C12FA AND C130C

Monitor runs whenever the following DTCs are not stored C130D: Brake pressure control solenoid main relay 2 short circuit
Either of the following conditions are met -
Brake system voltage Higher than 7 V
After main relay ON, main relay monitor on experience Not existing
C12FB AND C130D

Monitor runs whenever the following DTCs are not stored C0597 (Case 1): EEPROM malfunction
C0597 (Case 2): Lost communication
C0597 (Case 3 and 5): CPU malfunction
C0597 (Case 4): IC malfunction
Command to main relay Off