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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 36 (Electronically Controlled Brake System (HV) - Diagnostic Codes (06 Of 11)) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model) >> DTC C123A-00: IG1 Malfunction [12/2019 - 11/2023] >> Description

DTC C123A-00: IG1 Malfunction [12/2019 - 11/2023]: Description

WARNING: This page is about a different variant/trim than selected.

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 2.8 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
  • Output ECU: Both skid control ECUs