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Engine-Codes – Mercury – B1347 Mercury

B1347 Mercury Code - Heated Backlite Relay Coil Circuit Failure

Quick Answer

The B1347 diagnostic trouble code (DTC) for Mercury vehicles indicates a Heated Backlite Relay Coil Circuit Failure. Common causes include Faulty relay coil in the heated backlite circuit, Wiring issues such as shorts or open circuits, Blown fuse related to the heated backlite system. 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
B1347 Mercury indicates Heated Backlite Relay Coil Circuit Failure.
Common causes
Common causes include Faulty relay coil in the heated backlite circuit, Wiring issues such as shorts or open circuits, Blown fuse related to the heated backlite system.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 16, 2024
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Code B1347 Mercury Description

The B1347 diagnostic trouble code (DTC) for Mercury vehicles indicates a Heated Backlite Relay Coil Circuit Failure. This code specifically refers to an issue with the relay coil circuit that controls the heated backlite, which is the rear window defroster in the vehicle. The heated backlite is a crucial component, especially in colder climates, as it helps to defrost and clear condensation from the rear window for better visibility while driving.

OBDII Code B1347 Mercury - Heated Backlite Relay Coil Circuit Failure
B1347 Mercury Code - Heated Backlite Relay Coil Circuit Failure

Common Causes of B1347 Mercury

  1. Faulty relay coil in the heated backlite circuit.
  2. Wiring issues such as shorts or open circuits.
  3. Blown fuse related to the heated backlite system.
  4. Malfunctioning control module that controls the rear window defroster.
  5. Corrosion or damage to electrical connectors in the circuit.

Symptoms of B1347 Mercury

  1. Rear window defroster not working or working intermittently.
  2. Rear window visibility is reduced due to condensation buildup.
  3. Illumination of the rear defroster indicator light on the dashboard.
  4. Electrical burning smell coming from the rear of the vehicle.

How to Fix B1347 Mercury

  1. Begin by conducting a thorough inspection of the heated backlite relay coil circuit to identify any visible damage or loose connections.
  2. Test the relay coil for continuity and proper functioning using a multimeter.
  3. Check the fuse related to the heated backlite system and replace if necessary.
  4. Inspect the wiring for any signs of damage or corrosion and repair or replace as needed.
  5. If the issue persists, consider replacing the control module responsible for the rear window defroster.

Cost to Fix B1347 Mercury

The typical repair costs for addressing a Heated Backlite Relay Coil Circuit Failure can vary depending on the specific cause of the issue and the labor rates in your area. On average, the cost of parts for this repair can range from $50 to $200, while labor costs can range from $100 to $300. Keep in mind that these are rough estimates, and actual costs may vary based on the vehicle's make and model, the extent of the repair needed, and the rates charged by the auto repair shop. It is recommended to obtain quotes from multiple shops to compare prices and ensure a fair cost for the repair.

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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 B1347 Mercury Code

1. What are the common symptoms of OBDII code B1347 (Heated Backlite Relay Coil Circuit Failure)?

The common symptoms include the rear defroster not working, the rear window not clearing frost or condensation properly, and the rear defroster indicator light staying illuminated.

2. What can cause the OBDII code B1347 to trigger in a Mercury vehicle?

The code B1347 is typically triggered by a failure in the heated backlite relay coil circuit, which can be caused by a faulty relay, damaged wiring, or a malfunctioning backlite grid.

3. How can I diagnose the cause of OBDII code B1347 in my Mercury?

To diagnose OBDII code B1347, you can start by checking the relay, inspecting the wiring for any damage, and testing the backlite grid for continuity. Using a multimeter can help pinpoint the exact issue.

4. What are some repair tips for fixing OBDII code B1347 in a Mercury?

Repairing OBDII code B1347 may involve replacing the faulty relay, repairing any damaged wiring, or fixing issues with the backlite grid. It's important to follow the manufacturer's diagnostic and repair procedures.

5. Can I continue driving my Mercury with OBDII code B1347 present?

While the vehicle may still be drivable with the code present, it's recommended to address the issue promptly to ensure the proper functioning of the rear defroster and rear visibility, especially in cold or rainy conditions.

6. How serious is OBDII code B1347 in a Mercury?

OBDII code B1347 should be addressed in a timely manner to ensure the rear defroster functions correctly. Ignoring the issue may lead to reduced visibility through the rear window, particularly in adverse weather conditions.

7. Are there any safety concerns associated with OBDII code B1347 in a Mercury?

Yes, OBDII code B1347 can impact safety by reducing visibility through the rear window, especially in situations where the rear defroster is needed to clear frost, ice, or condensation.

8. Can I reset OBDII code B1347 in my Mercury without fixing the issue?

While you can clear the code using an OBDII scanner, it's important to address the underlying cause to prevent the code from reoccurring and ensure the proper functioning of the rear defroster.

9. Is it possible to prevent OBDII code B1347 from occurring in my Mercury?

Regularly inspecting and maintaining the rear defroster system, including the relay, wiring, and backlite grid, can help prevent issues that may trigger OBDII code B1347 in your Mercury.

10. How much does it typically cost to repair OBDII code B1347 in a Mercury?

The cost of repairing OBDII code B1347 can vary depending on the exact cause of the issue, parts needed for replacement, and labor costs. It's advisable to consult a professional mechanic for an accurate estimate.

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