B1D79 Code - Microphone Input Circuit General Electrical Failure
Quick Answer
When the VOICE switch is pressed, it changes a reference voltage signal, and the audio system enters voice recognition mode. Common causes include Faulty Microphone, Microphone harness is open or shorted, Microphone 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
- B1D79 indicates Microphone Input Circuit General Electrical Failure.
- Common causes
- Common causes include Faulty Microphone, Microphone harness is open or shorted, Microphone 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 B1D79 Description
The microphone test is available through the ACM self-diagnostic mode (navigation only). Running this test causes the ACM to produce a test tone. If the system is operating correctly, the microphone detects the tone and produces a signal to the ACM indicating the tone was heard. The OBDII set by the ACM during the microphone test when it does not receive an adequate signal from the microphone when the test tone is sounded.
What are the Possible Causes of the DTC B1D79?
- Faulty Microphone
- Microphone harness is open or shorted
- Microphone circuit poor electrical connection
- Faulty Audio Control Module (ACM) (if equipped)
- Faulty Accessory Protocol Interface Module (APIM) (if equipped)
How to Fix the DTC B1D79?
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 B1D79 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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Information for Specific Makes
- B1D79 Ford — Microphone Input Circuit General Electrical Failure
- B1D79 Lincoln — Microphone Input Circuit General Electrical Failure
- B1D79 Mercury — Microphone Input Circuit General Electrical Failure
Frequently Asked Questions about B1D79 Code
1. What are the common symptoms of OBDII code B1D79 (Microphone Input Circuit General Electrical Failure)?
- Common symptoms include the microphone not working, poor sound quality during calls, and the voice command system not responding.
2. What are the possible causes of OBDII code B1D79?
- The code B1D79 can be caused by a faulty microphone, damaged wiring in the microphone circuit, or a malfunctioning audio control module.
3. How can I diagnose the issue related to OBDII code B1D79?
- To diagnose the issue, you can start by inspecting the microphone and its wiring for any visible damage. You can also use a multimeter to check for continuity in the circuit.
4. Can I repair OBDII code B1D79 myself?
- Depending on the cause of the issue, you may be able to repair OBDII code B1D79 yourself by replacing the faulty microphone, repairing damaged wiring, or resetting the audio control module.
5. Is it safe to continue driving with OBDII code B1D79?
- While it may be safe to continue driving with this code, it is recommended to address the issue promptly to ensure proper functionality of the microphone and voice command system.
6. How much does it typically cost to repair OBDII code B1D79?
- The cost of repairing OBDII code B1D79 can vary depending on the cause of the issue and whether you choose to do the repairs yourself or take your vehicle to a professional mechanic. Costs may range from $50 to $300.
7. Can a malfunctioning microphone cause other audio system problems in the vehicle?
- Yes, a malfunctioning microphone can cause other audio system problems, such as distorted sound quality, issues with hands-free calling, and voice command system failures.
8. Are there any preventive measures to avoid OBDII code B1D79 in the future?
- To prevent OBDII code B1D79, it is recommended to regularly check the condition of the microphone and its wiring, avoid exposing the microphone to moisture or physical damage, and follow proper maintenance practices for the audio system.
9. How long does it typically take to repair OBDII code B1D79?
- The repair time for OBDII code B1D79 can vary depending on the complexity of the issue and the availability of replacement parts. In general, the repair can take anywhere from 1 to 3 hours.
10. Will clearing the OBDII code B1D79 resolve the issue temporarily?
- Clearing the OBDII code B1D79 may temporarily remove the warning light, but if the underlying issue is not addressed, the code is likely to reappear. It is important to diagnose and repair the root cause of the problem.
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