AutoCodes – Generic – B1304

B1304 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 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 18,895

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

What does this mean?

What are the Possible Causes of the DTC B1304?

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?

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 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 code?

Need more information on how to fix the B1304 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1304 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1304 Ford — Accessory Delay Relay Coil Circuit Short To Battery
B1304 Lincoln — Accessory Delay Relay Coil Circuit Short To Battery
B1304 Mercury — Accessory Delay Relay Coil Circuit Short To Battery

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 Code

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

The common symptoms of OBDII code B1304, Accessory Delay Relay Coil Circuit Short To Battery, may include issues with delayed accessory operation, such as lights or power windows not functioning properly.

2. What can cause the Accessory Delay Relay Coil Circuit to short to the battery?

The Accessory Delay Relay Coil Circuit may short to the battery due to damaged wiring, a faulty relay, or a short circuit in the electrical system.

3. How can I diagnose the cause of OBDII code B1304?

To diagnose the cause of OBDII code B1304, you can perform a visual inspection of the wiring, test the relay for proper functioning, and check for any signs of a short circuit in the circuit.

4. Can I still drive my vehicle with OBDII code B1304 present?

It is not recommended to drive your vehicle with OBDII code B1304 present, as it can lead to further electrical issues and potentially cause damage to other components in the system.

5. How can I repair OBDII code B1304?

To repair OBDII code B1304, you may need to replace the damaged wiring, faulty relay, or repair any short circuits in the circuit. It is recommended to consult a professional mechanic for proper diagnosis and repair.

6. Is OBDII code B1304 a common issue in vehicles?

OBDII code B1304, Accessory Delay Relay Coil Circuit Short To Battery, is not as common as some other OBDII codes, but it can occur in vehicles with electrical system issues.

7. Can a DIY enthusiast fix OBDII code B1304?

Depending on your skill level and experience with automotive repairs, a DIY enthusiast may be able to fix OBDII code B1304 by following repair guides or tutorials. However, it is recommended to seek professional help if unsure.

8. Will resetting the OBDII code B1304 turn off the check engine light?

Resetting the OBDII code B1304 may turn off the check engine light temporarily, but if the underlying issue is not fixed, the code and light may reappear.

9. Are there any safety concerns associated with OBDII code B1304?

While OBDII code B1304 may not directly pose a safety risk, it can affect the proper functioning of electrical components in your vehicle, which can impact overall safety and performance.

10. How much does it cost to repair OBDII code B1304?

The cost to repair OBDII code B1304 can vary depending on the extent of the damage, parts needed for replacement, and labor costs. It is recommended to obtain quotes from different mechanics or repair shops for an accurate estimate.