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Home >> Lexus >> 2021 >> LS 500h RWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (W/O Advanced Park) - Diagnostic Codes (1 Of 3) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Advanced Park) >> DTC C1249: Open Circuit in Stop Light Switch Circuit; DTC P0573: Brake Switch "A" Circuit High [10/2020 - 10/2023] >> Monitor Description

Monitor Description

When the voltage at terminal STP is outside the range of that when the stop light switch assembly is on or the range of that when the stop light switch assembly is off for a certain amount of time, the skid control ECU assembly judges that there is an open in the stop light switch assembly circuit and illuminates the MIL and stores a DTC.

Also, if the voltage at terminal STP is always within the range of that when the stop light switch assembly is on after the vehicle is driven at a certain speed or more and stopped a specific number of times, the skid control ECU assembly judges that the stop light switch assembly is stuck on and illuminates the MIL and stores a DTC.