Home >> Lexus >> 2021 >> ES 300h Luxury >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (Hybrid) - Diagnostic Codes (2 Of 5) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model) >> DTC C1311: Open Circuit in Main Relay 1; DTC C1312: Short Circuit in Main Relay 1 [06/2018 - ] >> Typical Malfunction Thresholds