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Home >> Lexus >> 2021 >> LS 500 Base, RWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Exterior Lights >> Lighting System (Ext) - Diagnostic Codes (2 Of 3) >> Lighting System >> DTC B242E-14: IG Circuit Short to Ground or Open [10/2023 - ] >> Description

DTC B242E-14: IG Circuit Short to Ground or Open [10/2023 - ]: Description

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

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

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

DTC No. Detection Item DTC Detection Condition Trouble Area Priority
B242E-14 IG Circuit Short to Ground or Open Detection condition: 
  1. The ignition switch is ON.

Malfunction status: 
  1. When the IGR terminal power source voltage is 0 V (ignition switch off), ignition switch 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
 A
DTC No. Detection Item DTC Detection Condition Trouble Area Priority
B242E-14 IG Circuit Short to Ground or Open Detection condition: 
  1. The ignition switch is ON.

Malfunction status: 
  1. When the IGR terminal power source voltage is 0 V (ignition switch off), ignition switch 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
 A
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