B1278 - Headlight Switch ON Position Circuit Malfunction

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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B1278 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)

First diagnose B1278 code

    Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded terminals.

Cost of diagnosing the B1278 code

    Labor: 1.0

    The cost of diagnosing the B1278 code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

B1278 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 More Information

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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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B1278 Comments

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