AutoCodes – Acura – B1278 Acura

B1278 Acura 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 Acura 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.

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Code Popularity 1,005

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1278 Acura 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 Acura - Headlight Switch ON Position Circuit Malfunction - AutoCodes.com — B1278 Acura Code - Headlight Switch ON Position Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC B1278 Acura?

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 Acura?

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 Acura 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.

Need more information about the B1278 Acura code?

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Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1278 Acura Code

1. What are the common symptoms of OBDII code B1278 in an Acura related to the Headlight Switch ON Position Circuit Malfunction?

- Common symptoms include malfunctioning headlights, flickering lights, or the inability to turn on the headlights.

2. What are the typical causes of the B1278 OBDII code in Acura vehicles?

- The code is usually caused by a faulty headlight switch, damaged wiring related to the headlight circuit, or a malfunctioning headlight control module.

3. How can I diagnose the cause of the B1278 code in my Acura?

- You can start by checking the headlight switch for proper functionality, inspecting the wiring for any visible damage, and using a diagnostic tool to scan for specific electrical issues.

4. Can I still drive my Acura with the B1278 code present?

- It is not recommended to drive with the B1278 code active, as it may result in unsafe driving conditions due to malfunctioning headlights.

5. How can I repair the Headlight Switch ON Position Circuit Malfunction in my Acura?

- Repair options may include replacing the headlight switch, repairing damaged wiring, or addressing any issues with the headlight control module.

6. Is it possible to reset the B1278 code without addressing the underlying issue?

- Resetting the code without fixing the root cause will likely result in the code reappearing once the issue persists.

7. Can a DIY enthusiast fix the B1278 code issue in an Acura?

- Depending on your skill level and access to tools, some simple repairs related to the headlight circuit may be possible for DIY enthusiasts. However, complex issues may require professional assistance.

8. How much can I expect to pay for repairing the B1278 code in my Acura?

- The cost of repair can vary based on the specific issue causing the code, but it's advisable to budget for replacement parts and labor costs.

9. Are there any preventive measures to avoid the B1278 code in the future?

- Regularly checking and maintaining the headlight system, including the switch and wiring, can help prevent issues that may trigger the B1278 code.

10. Will fixing the B1278 code improve the overall performance of my Acura?

- Resolving the Headlight Switch ON Position Circuit Malfunction is crucial for ensuring proper headlight functionality, which is essential for safe driving and overall vehicle performance.