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Home >> Toyota >> 2020 >> RAV4 XLE, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 44 (Lighting System (Ext) - Diagnostic Codes & Circuit Tests (1 Of 2)) >> Lighting System >> DTC B2439-00: Headlight LH Circuit; DTC B243A-00: Headlight RH Circuit [10/2023 - ] >> Description

DTC B2439-00: Headlight LH Circuit; DTC B243A-00: Headlight RH Circuit [10/2023 - ]: Description

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These DTCs are stored when the low beam headlights do not illuminate, or a communication malfunction is detected between the light control LED ECU and main body ECU (multiplex network body ECU).

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
B2439-00 Headlight LH Circuit Detection condition: 
  1. All of the following conditions are met:
    • Ignition switch ON
    • Low beam headlights on

Malfunction status: 
  • Headlight assembly LH malfunction
  • Open/short in Lo/Hi beam circuit

Malfunction duration: 
  1. 10 seconds or more
  • Headlight assembly LH
  • H-LP LH relay
  • Instrument panel junction block assembly
  • Main body ECU (multiplex network body ECU)
  • Harness or connector
 Main Body
B243A-00 Headlight RH Circuit Detection condition: 
  1. All of the following conditions are met:
    • Ignition switch ON
    • Low beam headlights on

Malfunction status: 
  • Headlight assembly RH malfunction
  • Open/short in Lo/Hi beam circuit

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