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B1278

B1278 - Headlight Switch ON Position Circuit Malfunction

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

  • Faulty Combination Headlight Switch
  • Combination Headlight Switch harness is open or shorted
  • Combination Headlight Switch circuit poor electrical connection
  • Faulty Multiplex Integrated Control Unit (MICU)
      What does this mean?

    • Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

    • B1278 Description

    The Multiplex Integrated Control Unit (MICU) monitors the Headlight Switch Position. The MICU sets the OBDII code when the Headlight Switch Position is not to factory specifications.
    OBDII Code B1278 - Headlight Switch ON Position Circuit Malfunction - AutoCodes.com

    B1278 Information for specific makes

  • B1278 ACURA Headlight Switch ON Position Circuit Malfunction
  • B1278 HONDA Headlight Switch ON Position Circuit Malfunction

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    Related Information

    B1278 Comments

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    Repair Importance Level: 3
     
    1=Low 2=Medium 3=High  
    Repair Difficulty Level: 3
     
    1=Easy 2=Moderate 3=Hard  
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