AutoCodes – Lincoln – B1304 Lincoln

B1304 Lincoln 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 Lincoln 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 1,040

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

What does this mean?

What are the Possible Causes of the DTC B1304 Lincoln?

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 Lincoln?

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 Lincoln 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 B1304 Lincoln Code

What does the OBDII code B1304 mean for a Lincoln vehicle?

B1304 indicates a short circuit in the accessory delay relay coil circuit, which can affect the operation of accessories that are supposed to have delayed shutdown.

What are common symptoms of the B1304 code?

Common symptoms include the failure of accessories to turn off after the ignition is switched off, battery drain when the vehicle is parked, or issues with the vehicle's electrical systems.

What could cause the B1304 code to trigger?

Causes may include a faulty accessory delay relay, damaged wiring or connectors in the coil circuit, or a short circuit to battery voltage due to wear or damage.

How can I diagnose the B1304 code?

Start by visually inspecting the accessory delay relay and its wiring for damage or corrosion. Use a multimeter to check for continuity and look for shorts in the circuit.

What does it mean if the B1304 code keeps returning after repairs?

If the code returns, it may indicate an underlying issue that wasnâ€™t addressed, such as a persistent short circuit, a defective relay, or damaged wiring that needs further investigation.

Can I drive my Lincoln safely with a B1304 code?

While it may be safe to drive, the issue could lead to battery drain or malfunctioning accessories, so it's advisable to have it diagnosed and repaired promptly.

What are some repair tips for fixing the B1304 code?

Repair tips include replacing the faulty accessory delay relay, repairing or replacing any damaged wiring, and ensuring all connections are clean and secure.

Is it necessary to clear the code after repairs?

Yes, after performing repairs, you should clear the code using an OBDII scanner and then test drive the vehicle to ensure the issue is resolved and the code does not return.

Could the B1304 code affect other systems in my vehicle?

Yes, since the code relates to the accessory delay relay, it could potentially affect other electrical accessories and systems that rely on this relay for proper functioning.