AutoCodes – Mercury – B1304 Mercury

B1304 Mercury Code - Accessory Delay Relay Coil Circuit Short To Battery

Quick Answer

The accessory delay relay receives voltage at all times from the Smart Junction Box (SJB). Common causes include Faulty Accessory Delay Relay, Accessory Delay Relay harness is open or shorted, Accessory Delay Relay circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: B1304 Mercury indicates Accessory Delay Relay Coil Circuit Short To Battery.
Common causes: Common causes include Faulty Accessory Delay Relay, Accessory Delay Relay harness is open or shorted, Accessory Delay Relay circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 710

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1304 Mercury Description

The accessory delay relay receives voltage at all times from the Smart Junction Box (SJB). The SJB controls the coil side ground of the accessory delay relay and activates the accessory delay relay when the ignition switch is in the ON position. The accessory delay relay remains active for an additional 10 minutes when the ignition switch is in the OFF position or until the driver door is opened. The accessory delay relay provides voltage to the door lock switches, power windows and roof opening panel (if equipped).

OBDII Code B1304 Mercury - Accessory Delay Relay Coil Circuit Short To Battery - AutoCodes.com — B1304 Mercury Code - Accessory Delay Relay Coil Circuit Short To Battery

What does this mean?

What are the Possible Causes of the DTC B1304 Mercury?

Faulty Accessory Delay Relay
Accessory Delay Relay harness is open or shorted
Accessory Delay Relay circuit poor electrical connection
Faulty Smart Junction Box (SJB)

How to Fix the DTC B1304 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 B1304 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 B1304 Mercury code?

Need more information on how to fix the B1304 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 B1304 Mercury Code

1. What are the common symptoms of OBDII code B1304 Mercury?

- Common symptoms include accessory delay features not functioning properly, such as delayed interior lighting or power windows.

2. What causes the OBDII code B1304 Mercury to trigger?

- This code is triggered when the Accessory Delay Relay Coil circuit experiences a short to the battery.

3. How can I diagnose the Accessory Delay Relay Coil circuit for a short to the battery?

- Use a multimeter to test for continuity and check for any obvious signs of damage or corrosion in the wiring.

4. What are some potential repair tips for fixing the Accessory Delay Relay Coil circuit short to battery issue?

- Repairing or replacing damaged wiring, connectors, or the Accessory Delay Relay itself can help resolve the issue.

5. Can the OBDII code B1304 Mercury affect other electrical systems in the vehicle?

- Yes, since the Accessory Delay Relay controls various electrical features, a short in this circuit can impact other systems relying on it.

6. Is it safe to continue driving with the B1304 code triggered in my Mercury?

- It is generally not recommended to drive with this code triggered, as it can lead to further electrical issues and potential safety hazards.

7. How do I reset the OBDII code B1304 in my Mercury after making repairs?

- After fixing the issue causing the code, you can reset it using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes.

8. Are there any preventive measures to avoid the Accessory Delay Relay Coil circuit short to battery issue?

- Regularly inspecting the wiring harness for signs of wear and ensuring proper installation of electrical components can help prevent this issue.

9. Can a DIY enthusiast repair the Accessory Delay Relay Coil circuit short to battery problem?

- Depending on your skill level and access to tools, a DIY enthusiast may be able to diagnose and repair this issue, but professional help is recommended for complex electrical repairs.

10. How can I find the exact location of the Accessory Delay Relay in my Mercury for inspection or replacement?

- Consult your vehicle's service manual or seek guidance from an automotive professional to locate the Accessory Delay Relay in your specific Mercury model.