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Home >> Lexus >> 2020 >> LC 500 >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System - Diagnostic Codes (Coupe) (2 Of 4) >> Electronically Controlled Brake System >> DTC C1249: Open Circuit in Stop Light Switch Circuit [09/2018 - ] >> Description

DTC C1249: Open Circuit in Stop Light Switch Circuit [09/2018 - ]: Description

The skid control ECU assembly receives the stop light switch assembly signal and detects the brake pedal operation status.

The skid control ECU assembly has an open detection circuit, which stores this DTC if it detects an open in the stop light input line or ground line of the stop light circuit with the stop light switch assembly off (brake pedal not depressed).

DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1249 Open Circuit in Stop Light Switch Circuit 520 When IG2 terminal voltage is 9.5 V or more, an open stop light switch circuit continues for 10 seconds or more.
  • Wire harness or connector (refer to "Open Detection Area")
  • Improperly connected connector, deformation or corrosion of terminals
  • Stop light switch assembly
  • No. 3 semiconductor power integration ECU
  • Skid control ECU assembly
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