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Home >> Lexus >> 2022 >> LS 500h RWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (W/ Advanced Park) - Diagnostic Codes (3 Of 5) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/ Advanced Park) >> DTC C123A-00: IG1 Malfunction [11/2021 - 10/2023] >> Description

DTC C123A-00: IG1 Malfunction [11/2021 - 10/2023]: Description

Refer to DTC C110E-14.

Refer to DESCRIPTION 

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Note
C123A-00 IG1 Malfunction When the IG1 terminal voltage is less than 3.8 V, the IG2 terminal voltage is 10.2 V or more for 4 seconds or more.
  • Open or short in IG1 circuit
  • Improperly connected connector, deformation or corrosion of terminals
  • No. 1 skid control ECU (brake booster with master cylinder assembly)
 Comes on
  • SAE Code: C123B (Case 2)
  • Output ECU: Both skid control ECUs
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