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Home >> Lexus >> 2021 >> LS 500 Base, AWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (W/ Vacuum Brake Booster) - Diagnostic Codes (3 Of 4) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/ Vacuum Brake Booster) >> DTC C1426: Stop Light Switch OFF Stuck Malfunction [12/2017 - 09/2018] >> Description

DTC C1426: Stop Light Switch OFF Stuck Malfunction [12/2017 - 09/2018]: Description

The skid control ECU (brake actuator assembly) inputs the stop light signal and brake operation condition.

When the brake pedal is depressed and the stop light switch signal is not input, C1426 is output.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
C1426 Stop Light Switch OFF Stuck Malfunction When voltage at terminal +BS is 9.5 V or higher, vehicle is driven and brake pedal is operated, stop light switch signal is not input.
  • STOP fuse
  • Wire harness or connector
  • Stop light switch assembly
  • Brake pedal load sensing switch (brake pedal support assembly)
  • Skid control ECU (brake actuator assembly)
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