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Home >> Lexus >> 2023 >> ES 350 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 B242E: Open in IG Circuit [10/2019 - ] >> Description

DTC B242E: Open in IG Circuit [10/2019 - ]: Description

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

The IG terminal power source voltage is supplied by turning the IG1-NO. 1 relay to ON.

The headlight ECU sub-assembly receives engine switch on (IG) signals from the main body ECU (multiplex network body ECU) via CAN communication, compares the engine switch on (IG) signal and the power source voltage supply condition of the IG terminal and monitors the result.

FOR LED TYPE TURN SIGNAL LIGHT

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
B242E Open in IG Circuit Detection condition: 
  1. The engine switch is on (IG).

Malfunction status: 
  1. When the IG terminal power source voltage is 0 V (engine switch off), IG ON signals from the main body ECU (multiplex network body ECU) via CAN communication are continuously received

Malfunction duration: 
  1. 10 seconds or more
  • Headlight ECU sub-assembly LH
  • Harness or connector
 AFS
FOR LED TYPE TURN SIGNAL LIGHT

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
B242E Open in IG Circuit Detection condition: 
  1. The engine switch is on (IG).

Malfunction status: 
  1. When the IG terminal power source voltage is 0 V (engine switch off), IG ON signals from the main body ECU (multiplex network body ECU) via CAN communication are continuously received

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

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
B242E Open in IG Circuit Detection condition: 
  1. The engine switch is on (IG).

Malfunction status: 
  1. When the IG terminal power source voltage is 0 V (engine switch off), IG ON signals from the main body ECU (multiplex network body ECU) via CAN communication are continuously received

Malfunction duration: 
  1. 10 seconds or more
  • Headlight ECU sub-assembly LH
  • Harness or connector
 HL AutoLeveling
FOR BULB TYPE TURN SIGNAL LIGHT

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
B242E Open in IG Circuit Detection condition: 
  1. The engine switch is on (IG).

Malfunction status: 
  1. When the IG terminal power source voltage is 0 V (engine switch off), IG ON signals from the main body ECU (multiplex network body ECU) via CAN communication are continuously received

Malfunction duration: 
  1. 10 seconds or more
  • Headlight ECU sub-assembly RH
  • Harness or connector
 HL AutoLeveling (Sub)
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