B1278 Honda Code - Headlight Switch ON Position Circuit Malfunction
Quick Answer
The Multiplex Integrated Control Unit (MICU) monitors the Headlight Switch Position. Common causes include Faulty Combination Headlight Switch, Combination Headlight Switch harness is open or shorted, Combination Headlight Switch circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- B1278 Honda indicates Headlight Switch ON Position Circuit Malfunction.
- Common causes
- Common causes include Faulty Combination Headlight Switch, Combination Headlight Switch harness is open or shorted, Combination Headlight Switch circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code B1278 Honda Description
What are the Possible Causes of the DTC B1278 Honda?
- 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)
How to Fix the DTC B1278 Honda?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B1278 Honda code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about B1278 Honda Code
1. What are the common symptoms of OBDII code B1278 in a Honda related to the Headlight Switch ON Position Circuit Malfunction?
- Common symptoms include malfunctioning headlights, flickering lights, or total loss of headlight function.
2. What are the possible causes of OBDII code B1278 in a Honda related to the Headlight Switch ON Position Circuit Malfunction?
- Possible causes may include a faulty headlight switch, damaged wiring or connectors, or a malfunctioning headlight control module.
3. How can I diagnose the OBDII code B1278 in a Honda related to the Headlight Switch ON Position Circuit Malfunction?
- You can diagnose this issue by checking the headlight switch for proper functionality, inspecting the wiring and connectors for any damage, and using a diagnostic scanner to read the trouble codes.
4. Can I still drive my Honda with OBDII code B1278 related to the Headlight Switch ON Position Circuit Malfunction?
- It is not recommended to drive your Honda with malfunctioning headlights, as it can pose a safety risk to you and other drivers on the road.
5. How can I repair OBDII code B1278 in a Honda related to the Headlight Switch ON Position Circuit Malfunction?
- Repair options may include replacing the headlight switch, repairing damaged wiring or connectors, or replacing the headlight control module, depending on the root cause of the issue.
6. Will resetting the OBDII code B1278 related to the Headlight Switch ON Position Circuit Malfunction make the problem go away?
- Resetting the code may temporarily turn off the warning light, but it will not fix the underlying issue causing the malfunction in the headlight circuit.
7. Is it possible to fix OBDII code B1278 in a Honda related to the Headlight Switch ON Position Circuit Malfunction without professional help?
- Depending on your automotive repair skills and access to tools, you may be able to diagnose and repair the issue yourself, but it is recommended to seek professional help for complex electrical problems.
8. How much does it cost to repair OBDII code B1278 related to the Headlight Switch ON Position Circuit Malfunction in a Honda?
- The cost of repair can vary depending on the exact cause of the issue, parts needed, and labor rates at your chosen repair shop. It is best to get a few quotes for an accurate estimate.
9. Can extreme weather conditions cause OBDII code B1278 in a Honda related to the Headlight Switch ON Position Circuit Malfunction?
- Extreme weather conditions like heavy rain or snow can potentially damage the headlight circuit components, leading to malfunctions and triggering the OBDII code B1278.
10. How often should I check the headlight system in my Honda to prevent OBDII code B1278 related to the Headlight Switch ON Position Circuit Malfunction?
- It is recommended to periodically inspect your headlight system for any signs of wear or damage to catch potential issues early and avoid triggering the OBDII code B1278.
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