AutoCodes – Mercury – B1347 Mercury

B1347 Mercury Code - Heated Backlite Relay Coil Circuit Failure

Quick Answer

When the rear defrosts switch on the climate control assembly is pressed, a ground signal is sent to the Smart Junction Box (SJB) on the circuit. Common causes include Faulty Heated Rear Window Relay, Faulty Heated Rear Window Switch, Faulty Heated Rear Window Grid. 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 Heated Rear Window Relay, Faulty Heated Rear Window Switch, Faulty Heated Rear Window Grid.
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 552

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 22, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1347 Mercury Description

When the rear defrosts switch on the climate control assembly is pressed, a ground signal is sent to the Smart Junction Box (SJB) on the circuit. The SJB then grounds circuit. This energizes the heated rear window relay, allowing voltage to be supplied to the heated rear window grid through the circuit. The OBDII code sets when the Heated Backlite Input is not to factory specifications.

OBDII Code B1347 Mercury - Heated Backlite Relay Coil Circuit Failure - AutoCodes.com — B1347 Mercury Code - Heated Backlite Relay Coil Circuit Failure

What does this mean?

What are the Possible Causes of the DTC B1347 Mercury?

Faulty Heated Rear Window Relay
Faulty Heated Rear Window Switch
Faulty Heated Rear Window Grid
Faulty Smart Junction Box (SJB)

How to Fix the DTC B1347 Mercury?

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 B1347 Mercury 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 B1347 Mercury code?

Need more information on how to fix the B1347 Mercury code? Get Access to Factory Service Manuals

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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.