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Home >> Lexus >> 2011 >> RX 350 AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Exterior Lights >> Lighting System (Exterior) (Diagnostic Codes & Circuit Tests) >> Lighting System >> DTC B124B: Automatic High Beam System >> Description

DTC B124B: Automatic High Beam System: Description

The DTC is stored when the main body ECU (multiplex network body ECU) detects malfunctions in the automatic high beam system.

DTC No. DTC Detection Condition Trouble Area
B124B Malfunction in automatic high beam system
  • Steering angle sensor (spiral cable sub-assembly), VSC system or EFI system
  • Inner rear view mirror assembly
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