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Home >> Lexus >> 2017 >> IS 300 F Sport >> Repair and Diagnosis >> External Pages >> Different car >> Section 4 (Lighting System (Ext) - Diagnostic Codes & Circuit Tests) >> Lighting System >> DTC B124B: Automatic High Beam System [09/2020 - ] >> Description

DTC B124B: Automatic High Beam System [09/2020 - ]: Description

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The main body ECU (multiplex network body ECU) determines the status of the automatic high beam system based on the automatic high beam system signal from the forward recognition camera.

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
B124B Automatic High Beam System Malfunction in automatic high beam system
  • Front camera system
  • Dynamic radar cruise control system
  • Lane tracing assist system
  • Road sign assist system*
  • Front radar sensor system
  • Pre-collision system
  • SFI system
  • Vehicle stability control system
  • CAN communication system
  • Forward recognition camera
  • Main body ECU (multiplex network body ECU)
 Main Body
  1. *: w/ Road Sign Assist System
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