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Engine-Codes – Generic – B1303

B1303 Code - Accessory Delay Relay Coil Circuit Open

Quick Answer

The B1303 diagnostic trouble code refers to an issue with the Accessory Delay Relay Coil Circuit being open. Common causes include Faulty Accessory Delay Relay, Loose or damaged wiring connections, Corrosion or damage to relay or circuit components. 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
B1303 indicates Accessory Delay Relay Coil Circuit Open.
Common causes
Common causes include Faulty Accessory Delay Relay, Loose or damaged wiring connections, Corrosion or damage to relay or circuit components.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code B1303 Description

The B1303 diagnostic trouble code refers to an issue with the Accessory Delay Relay Coil Circuit being open. This relay is responsible for controlling various accessories in the vehicle, such as power windows, radio, and interior lights, allowing them to remain functional for a short period after the vehicle is turned off or the doors are opened. When the circuit is open, it means that there is a break in the electrical connection, preventing the relay from functioning properly.

OBDII Code B1303 - Accessory Delay Relay Coil Circuit Open
B1303 Code - Accessory Delay Relay Coil Circuit Open

Common Causes of B1303

  1. Faulty Accessory Delay Relay.
  2. Loose or damaged wiring connections.
  3. Corrosion or damage to relay or circuit components.
  4. Electrical system issues such as a blown fuse or short circuit.
  5. Water damage or exposure to moisture affecting the relay circuit.

Symptoms of B1303

  1. Inoperative power windows or other accessories controlled by the relay.
  2. Interior lights not turning on or staying on longer than usual.
  3. Accessories turning off immediately when the vehicle is turned off.
  4. Increased battery drain leading to difficulty starting the vehicle.

How to Fix B1303

  1. Begin by conducting a visual inspection of the relay and associated wiring to check for any obvious signs of damage or corrosion.
  2. Test the relay using a multimeter to determine if it is functioning correctly. If the relay is faulty, it will need to be replaced.
  3. Check and repair any loose or damaged wiring connections, ensuring a secure and proper electrical connection.
  4. Inspect the fuse related to the accessory delay relay circuit and replace if necessary.
  5. Clear the diagnostic trouble code from the vehicle's system using a scan tool after completing the repairs to ensure the issue has been resolved.

Cost to Fix B1303

The cost of repairing a B1303 code related to an Accessory Delay Relay Coil Circuit Open can vary depending on the vehicle make and model, the location of the repair shop, and the specific parts and labor required. On average, the repair cost for this issue can range from $100 to $300, including parts and labor. It is essential to consult with a certified mechanic or repair shop to get an accurate estimate based on your vehicle's specific requirements and the extent of the repair needed. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, so it's advisable to inquire about these factors before proceeding with the repair.

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Code B1303 Information for Specific Makes

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 B1303 Code

1. What are the common symptoms of OBDII code B1303 (Accessory Delay Relay Coil Circuit Open)?

- The common symptoms include the interior lights not working, power windows not operating correctly, and the radio losing its memory settings.

2. What are the possible causes of OBDII code B1303?

- The possible causes of B1303 can be a faulty accessory delay relay, a damaged relay coil, a wiring issue in the circuit, or a poor connection in the relay circuit.

3. How can I diagnose the cause of OBDII code B1303?

- You can diagnose B1303 by checking the accessory delay relay for proper operation, testing the relay coil for continuity, inspecting the wiring for any damage or corrosion, and ensuring all connections in the circuit are secure.

4. Can I still drive my vehicle with OBDII code B1303?

- It is generally safe to drive your vehicle with code B1303, but you may experience issues with certain accessories like interior lights and power windows until the problem is resolved.

5. How can I repair OBDII code B1303 (Accessory Delay Relay Coil Circuit Open)?

- To repair B1303, you may need to replace the faulty accessory delay relay, repair or replace the damaged relay coil, repair any wiring issues, or fix poor connections in the relay circuit.

6. Is it possible to reset OBDII code B1303 without fixing the underlying issue?

- Resetting the code without fixing the underlying issue will only temporarily clear the error code. It is essential to diagnose and repair the root cause of B1303 to prevent the code from reoccurring.

7. Can a DIY enthusiast fix OBDII code B1303 at home?

- DIY enthusiasts with automotive repair experience can potentially fix B1303 at home by following diagnostic procedures, identifying the issue, and performing the necessary repairs or replacements.

8. Are there any safety precautions to consider when working on OBDII code B1303?

- When working on B1303, it is essential to disconnect the vehicle's battery before starting any repairs, wear appropriate safety gear, and follow proper procedures to avoid electrical hazards.

9. Will OBDII code B1303 cause my vehicle to fail an emissions test?

- OBDII code B1303 is related to accessory circuits and is unlikely to cause your vehicle to fail an emissions test. However, it is still important to address the issue for optimal vehicle performance.

10. How long does it typically take to repair OBDII code B1303?

- The time to repair B1303 can vary based on the cause of the issue, the availability of parts, and your level of experience. In general, it may take a few hours to a day to diagnose and resolve the problem.

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