AutoCodes – Ford – B1347 Ford

B1347 Ford 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 Ford 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 4,152

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

What does this mean?

What are the Possible Causes of the DTC B1347 Ford?

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 Ford?

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 Ford 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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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 Ford Code

1. What are the common symptoms of OBDII code B1347 in a Ford related to Heated Backlite Relay Coil Circuit Failure?

The common symptoms include the rear defroster not working, the rear window not clearing of fog or frost, and a lit up dashboard warning light indicating a fault.

2. What is the typical cause of OBDII code B1347 in a Ford related to Heated Backlite Relay Coil Circuit Failure?

The most common cause is a malfunction in the heated backlite relay coil circuit, which can be due to a faulty relay, damaged wiring, or a blown fuse.

3. How can I diagnose the issue with OBDII code B1347 in a Ford for Heated Backlite Relay Coil Circuit Failure?

You can use a multimeter to test the relay, check the wiring connections for any damage, and inspect the fuse related to the heated backlite system.

4. Is it safe to continue driving with OBDII code B1347 in a Ford related to Heated Backlite Relay Coil Circuit Failure?

It is generally safe to continue driving, but you may experience reduced visibility during adverse weather conditions without a functioning rear defroster.

5. What are some repair tips for fixing OBDII code B1347 in a Ford related to Heated Backlite Relay Coil Circuit Failure?

Try checking and replacing the relay first, followed by inspecting and repairing any damaged wiring. Ensure all connections are secure and test the system before finalizing repairs.

6. Can resetting the OBDII code B1347 in a Ford related to Heated Backlite Relay Coil Circuit Failure fix the issue?

Resetting the code may temporarily turn off the warning light, but the underlying issue causing the fault will still need to be diagnosed and repaired to ensure the system functions correctly.

7. How much does it typically cost to repair OBDII code B1347 in a Ford related to Heated Backlite Relay Coil Circuit Failure?

The cost can vary depending on the exact cause of the issue, but it may range from $50 to $200 for parts and labor, excluding diagnostic fees.

8. Are there any preventative measures to avoid OBDII code B1347 in a Ford related to Heated Backlite Relay Coil Circuit Failure?

Regularly checking the functionality of the rear defroster and addressing any issues promptly can help prevent the occurrence of this OBDII code.

9. Can extreme weather conditions contribute to triggering OBDII code B1347 in a Ford related to Heated Backlite Relay Coil Circuit Failure?

Yes, extreme cold or humidity can strain the heated backlite system, potentially leading to failures in the relay coil circuit and triggering the OBDII code.

10. Is OBDII code B1347 specific to Ford vehicles, or can it occur in other car makes and models?

While the specific code B1347 may be unique to Ford vehicles, similar issues with the heated backlite relay coil circuit can occur in other car makes and models, often with different OBDII codes.