AutoCodes – Ford – B1349 Ford

B1349 Ford Code - Heated Backlite Relay Short to Battery

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: B1349 Ford indicates Heated Backlite Relay Short to Battery.
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 1,468

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 15, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1349 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 B1349 Ford - Heated Backlite Relay Short to Battery - AutoCodes.com — B1349 Ford Code - Heated Backlite Relay Short to Battery

What does this mean?

What are the Possible Causes of the DTC B1349 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 B1349 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 B1349 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 B1349 Ford Code

1. What are common symptoms of OBDII code B1349 Ford (Heated Backlite Relay Short to Battery)?

Common symptoms include a non-functional rear defroster, a blown fuse related to the rear defroster circuit, and potentially a lit warning light on the dashboard.

2. What causes the OBDII code B1349 Ford (Heated Backlite Relay Short to Battery)?

The code B1349 typically indicates a short to battery in the heated backlite relay circuit, which can be caused by a faulty relay, damaged wiring, or a malfunctioning backlite grid.

3. How can I diagnose the issue related to code B1349 Ford (Heated Backlite Relay Short to Battery)?

To diagnose the issue, you can use a multimeter to check the continuity of the backlite relay circuit, inspect the wiring for any visible damage, and test the relay for proper functioning.

4. Can I drive my vehicle with OBDII code B1349 Ford (Heated Backlite Relay Short to Battery)?

It is generally safe to drive the vehicle with this code, but you may experience issues with the rear defroster not functioning properly, especially in cold or humid conditions.

5. How do I repair OBDII code B1349 Ford (Heated Backlite Relay Short to Battery)?

Repairing the issue involves locating the faulty relay or damaged wiring, replacing the relay if necessary, and ensuring proper connection and insulation of the wiring to resolve the short to battery.

6. Is it possible to reset the OBDII code B1349 Ford (Heated Backlite Relay Short to Battery) without fixing the underlying issue?

While you can clear the code with an OBDII scanner, it will likely reappear if the root cause of the short to battery in the heated backlite relay circuit is not addressed.

7. Can extreme weather conditions contribute to triggering OBDII code B1349 Ford (Heated Backlite Relay Short to Battery)?

Yes, extreme cold or humid conditions can exacerbate issues with the rear defroster circuit, potentially leading to a short to battery and triggering the B1349 code.

8. How much does it typically cost to repair OBDII code B1349 Ford (Heated Backlite Relay Short to Battery)?

The cost of repair can vary depending on the extent of the damage, but it may range from $100 to $300 for parts and labor if a relay replacement or wiring repair is needed.

9. Are there any preventive measures to avoid OBDII code B1349 Ford (Heated Backlite Relay Short to Battery)?

Regularly inspecting and maintaining the rear defroster system, avoiding overloading the circuit with aftermarket accessories, and addressing any electrical issues promptly can help prevent this code.

10. Does OBDII code B1349 Ford (Heated Backlite Relay Short to Battery affect vehicle performance?

This code typically does not affect the overall performance of the vehicle but may impact the functionality of the rear defroster system, especially in adverse weather conditions.