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Home >> Lexus >> 2022 >> ES 250 Base >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting System (Ext) (Except Hybrid) - Diagnostic Codes (2 Of 2) & Symptom Tests >> LIGHTING SYSTEM (for Gasoline Model) >> DTC B242F: Open in B Power Line [10/2019 - ] >> Description

DTC B242F: Open in B Power Line [10/2019 - ]: Description

The headlight ECU sub-assembly operates using the power source voltage input from the IG terminal and ECUB terminal.

The power source voltage of the ECUB terminal is supplied when the main body ECU (multiplex network body ECU) turns the ECUB power supply relay (H-LP LH relay and H-LP RH relay) to ON.

The headlight ECU sub-assembly compares the power source voltage supply condition of the IG terminal and ECUB terminal and monitors the result.

FOR LED TYPE TURN SIGNAL LIGHT

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
B242F Open in B Power Line Detection condition: 
  1. The engine switch is on (IG).

Malfunction status: 
  1. No power source voltage supplied to ECUB terminal while power source voltage being supplied to IG terminal

Malfunction duration: 
  1. 10 seconds or more
  • Headlight ECU sub-assembly LH
  • Harness or connector
  • H-LP LH relay
  • Instrument panel junction block assembly
  • Main body ECU (multiplex network body ECU)
 AFS
FOR LED TYPE TURN SIGNAL LIGHT

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
B242F Open in B Power Line Detection condition: 
  1. The engine switch is on (IG).

Malfunction status: 
  1. No power source voltage supplied to ECUB terminal while power source voltage being supplied to IG terminal

Malfunction duration: 
  1. 10 seconds or more
  • Headlight ECU sub-assembly RH
  • Harness or connector
  • H-LP RH relay
  • Main body ECU (multiplex network body ECU)
 AFS (Sub)
FOR BULB TYPE TURN SIGNAL LIGHT

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
B242F Open in B Power Line Detection condition: 
  1. The engine switch is on (IG).

Malfunction status: 
  1. No power source voltage supplied to ECUB terminal while power source voltage being supplied to IG terminal

Malfunction duration: 
  1. 10 seconds or more
  • Headlight ECU sub-assembly LH
  • Harness or connector
  • H-LP LH relay
  • Instrument panel junction block assembly
  • Main body ECU (multiplex network body ECU)
 HL AutoLeveling
FOR BULB TYPE TURN SIGNAL LIGHT

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
B242F Open in B Power Line Detection condition: 
  1. The engine switch is on (IG).

Malfunction status: 
  1. No power source voltage supplied to ECUB terminal while power source voltage being supplied to IG terminal

Malfunction duration: 
  1. 10 seconds or more
  • Headlight ECU sub-assembly RH
  • Harness or connector
  • H-LP RH relay
  • Main body ECU (multiplex network body ECU)
 HL AutoLeveling (Sub)
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