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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 C1242: Open Circuit in IG1/IG2 Power Source Circuit [06/2018 - ] >> Description

DTC C1242: Open Circuit in IG1/IG2 Power Source Circuit [06/2018 - ]: Description

Refer to DTC C1241.

Refer to DTC C1241: Low or High Power Supply Voltage [06/2018 - 08/2020] , or refer to DTC C1241: Low or High Power Supply Voltage [08/2020 - ] 

DTC No. Detection Item INF Code DTC Detection Condition Trouble Area MIL Note
C1242 Open Circuit in IG1/IG2 Power Source Circuit 111
112
  • INF Code: 111
    • When the IG1 terminal voltage is less than 3.5 V, the IG2 terminal voltage is 9.5 V or more for 4 seconds or more.
  • INF Code: 112
    • When communication with the hybrid vehicle control ECU is normal or the vehicle speed is 10 km/h (6 mph) or more, and the IG1 terminal voltage is 9.5 V or more, the IG2 terminal voltage is less than 3.5 V for 4 seconds or more.
  • INF Code: 111
    • Open or short in IG1 circuit
    • Improperly connected connector, deformation or corrosion of terminals
    • Smart key system (IG start circuit)
    • Auxiliary battery
    • Hybrid control system (Charging circuit)
    • Skid control ECU (brake booster with master cylinder assembly)
  • INF Code: 112
    • Open or short in IG2 circuit
    • Improperly connected connector, deformation or corrosion of terminals
    • Smart key system (IG start circuit)
    • Auxiliary battery
    • Hybrid control system (Charging circuit)
    • Skid control ECU (brake booster with master cylinder assembly)
Comes on
  • INF Code 111: SAE Code C123B
  • INF Code 112: SAE Code C123E
  • Electronically controlled brake system DTC