AutoCodes – Generic – B1279

B1279 Code - Dimmer Switch Circuit Malfunction

Quick Answer

The Multiplex Integrated Control Unit (MICU) monitors the Dimmer Switch. Common causes include Faulty Dimmer Switch, Dimmer Switch harness is open or shorted, Dimmer Switch circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B1279 indicates Dimmer Switch Circuit Malfunction.
Common causes: Common causes include Faulty Dimmer Switch, Dimmer Switch harness is open or shorted, Dimmer Switch circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 8,417

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 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 B1279 Description

The Multiplex Integrated Control Unit (MICU) monitors the Dimmer Switch. The MICU sets the OBDII code when the Dimmer Switch is not to factory specifications.

OBDII Code B1279 - Dimmer Switch Circuit Malfunction - AutoCodes.com — B1279 Code - Dimmer Switch Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC B1279?

Faulty Dimmer Switch
Dimmer Switch harness is open or shorted
Dimmer Switch circuit poor electrical connection
Faulty Multiplex Integrated Control Unit (MICU)

How to Fix the DTC B1279?

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 B1279 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 B1279 code?

Need more information on how to fix the B1279 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1279 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1279 Acura — Dimmer Switch Circuit Malfunction
B1279 Honda — Dimmer Switch Circuit Malfunction

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 B1279 Code

1. What are the common symptoms of OBDII code B1279 (Dimmer Switch Circuit Malfunction)?

- Common symptoms include issues with adjusting the brightness of the dashboard lights or interior lighting, flickering lights, or complete failure of the dimmer switch functionality.

2. What are the possible causes of OBDII code B1279?

- The code B1279 can be triggered by a faulty dimmer switch, damaged wiring or connectors in the dimmer switch circuit, or a malfunctioning instrument cluster.

3. How can I diagnose the Dimmer Switch Circuit Malfunction related to code B1279?

- You can diagnose this issue by checking the dimmer switch for physical damage, testing the wiring and connectors for continuity, and using a diagnostic scanner to retrieve trouble codes and live data.

4. Can a DIY enthusiast repair the Dimmer Switch Circuit Malfunction associated with code B1279?

- Depending on your skill level and experience, you may be able to replace a faulty dimmer switch or repair damaged wiring yourself. However, more complex issues may require professional assistance.

5. What are some tips for repairing OBDII code B1279?

- Make sure to carefully inspect the dimmer switch, test the circuit for continuity, and follow a repair manual or wiring diagram specific to your vehicle to ensure proper repair.

6. Is it safe to continue driving with OBDII code B1279 active?

- While the vehicle may still be operational with this code, it is important to address the issue promptly to avoid potential safety hazards or further damage to the electrical system.

7. Can a dimmer switch problem cause other electrical issues in the vehicle?

- Yes, a malfunctioning dimmer switch can potentially cause other electrical issues, such as erratic dashboard lighting, inaccurate gauge readings, or problems with other interior lighting controls.

8. How much does it typically cost to repair OBDII code B1279?

- The cost of repairing OBDII code B1279 can vary depending on the root cause of the issue, labor rates in your area, and whether you choose to DIY or seek professional help. It's best to get a few quotes from local mechanics.

9. Will resetting the OBDII code B1279 clear the issue permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue with the dimmer switch circuit is not resolved, the code is likely to reappear. It's crucial to address the root cause of the problem.

10. How long does it typically take to repair the Dimmer Switch Circuit Malfunction related to OBDII code B1279?

- The repair time can vary depending on the exact cause of the issue and the complexity of the repair. Simple fixes like replacing a dimmer switch may take a couple of hours, while more involved repairs could take longer.