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Home >> Lexus >> 2010 >> RX 350 FWD >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting (Exterior) (Diagnostic Codes & Circuit Tests) >> Lighting System >> DTC B124B: Automatic High Beam System (To 08/2009) >> Procedure

DTC B124B: Automatic High Beam System (To 08/2009): Procedure

  1. CHECK FOR DTC 
    1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
    2. Check for DTCs. Refer to DTC CHECK / CLEAR .

      OK

      DTC B124B is not output.

    NG → See step   2 

    OK → See step   3 

  2. CHECK FOR DTC 
    1. Check for DTCs. Refer to DTC CHECK / CLEAR .

      Result

      Result Proceed to
      DTC B2414 is output A
      DTC B2415 is output B
      DTC U0126, DTC U0129 or DTC U0101 is output C
      Other DTC is not output D

    D → See step   7 

    C → See step   6 

    B → See step   5 

    A → See step   4 

  3. USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING 
  4. GO TO DTC CHART. Refer to  DTC B2414: Steering Position Sensor Malfunction  
  5. GO TO DTC CHART. Refer to  DTC B2415: Vehicle Speed Sensor Malfunction  
  6. GO TO DTC CHART. Refer to  DTC U0101: Lost Communication with ECM; DTC U0073: Control Module Communication Bus Off; DTC U0100: Lost Communication with ECM / PCM "A"; DTC U0126: Lost Communication with Steering Angle Sensor Module; DTC U0129: Lost Communication with Skid Control ECU; DTC U0130: Lost Communication with Steering Effort Control Module; DTC U0142: Lost Communication with Main Body ECU; DTC U0163: Lost Communication with Navigation Control Module; DTC U0182: Lost Communication with AFS ECU; DTC U1000: Can Communication Failure(Message Registry); DTC U1121: Lost Communication with Driver Seat Module  
  7. REPLACE INNER REAR VIEW MIRROR ASSEMBLY. Refer to  COMPONENTS