AutoCodes – Generic – B1579

B1579 Code - Dim Panel Increase Input Circuit Failure

Quick Answer

The Radio and Display Receiver Assembly (or Navigation Receiver Assembly) and Telephone Microphone Assembly are connected to each other using the microphone connection detection signal lines. Common causes include Faulty Map Light Assembly, Faulty Telephone Microphone Assembly, Telephone Microphone Assembly harness is open or shorted. 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: B1579 indicates Dim Panel Increase Input Circuit Failure.
Common causes: Common causes include Faulty Map Light Assembly, Faulty Telephone Microphone Assembly, Telephone Microphone Assembly harness is open or shorted.
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 8,589

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 Mar 25, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1579 Description

OBDII Code B1579 - Dim Panel Increase Input Circuit Failure - AutoCodes.com — B1579 Code - Dim Panel Increase Input Circuit Failure

What does this mean?

What are the Possible Causes of the DTC B1579?

Faulty Map Light Assembly
Faulty Telephone Microphone Assembly
Telephone Microphone Assembly harness is open or shorted
Telephone Microphone Assembly circuit poor electrical connection
Faulty Radio and Display Receiver Assembly (or Navigation Receiver Assembly)

How to Fix the DTC B1579?

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 B1579 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 B1579 code?

Need more information on how to fix the B1579 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1579 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1579 Lexus — Voice Recognition Microphone Disconnected
B1579 Scion — Voice Recognition Microphone Disconnected
B1579 Toyota — Voice Recognition Microphone Disconnected

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 B1579 Code

1. What are the common symptoms of OBDII code B1579 (Dim Panel Increase Input Circuit Failure)?

- Common symptoms include a dim or non-functional instrument panel, flickering dashboard lights, and issues with the brightness control of the instrument cluster.

2. What are the possible causes of OBDII code B1579?

- The code B1579 can be triggered by issues such as a faulty dimmer switch, a malfunctioning instrument panel cluster, wiring problems, or a blown fuse related to the panel illumination.

3. How can I diagnose the Dim Panel Increase Input Circuit Failure related to code B1579?

- To diagnose this issue, you can start by checking the dimmer switch for proper operation, inspecting the instrument panel cluster for any visible damage, and testing the wiring and fuses associated with the panel illumination circuit.

4. What repair tips can help fix OBDII code B1579?

- Repair tips for code B1579 may include replacing the dimmer switch if faulty, repairing or replacing the instrument panel cluster, checking and repairing any damaged wiring, and ensuring all related fuses are in good condition.

5. Can OBDII code B1579 be cleared/reset without repairing the issue?

- While you can clear the code temporarily, it is recommended to address the underlying issue causing the Dim Panel Increase Input Circuit Failure to prevent the code from reoccurring.

6. Is it safe to continue driving with OBDII code B1579 active?

- Driving with code B1579 may not pose an immediate safety risk, but it is advisable to address the issue promptly to avoid potential electrical problems or loss of important dashboard information while driving.

7. Will OBDII code B1579 cause my vehicle to fail an emissions test?

- Code B1579 related to Dim Panel Increase Input Circuit Failure is typically not emissions-related, so it may not directly cause your vehicle to fail an emissions test.

8. How much does it cost to repair OBDII code B1579?

- The cost of repairing code B1579 can vary depending on the underlying cause of the issue, the extent of the damage, and whether you choose to address the problem yourself or take your vehicle to a professional mechanic.

9. Can a DIY enthusiast fix OBDII code B1579 at home?

- Depending on your skill level and access to tools, some DIY enthusiasts may be able to address code B1579 by following repair guides, troubleshooting steps, and utilizing basic electrical knowledge.

10. Are there any recalls or technical service bulletins related to OBDII code B1579?

- It's recommended to check with your vehicle manufacturer or authorized service center for any recalls or technical service bulletins related to OBDII code B1579 for your specific make and model.