Engine-CodesMercury – B1303 Mercury

B1303 Mercury Code - Accessory Delay Relay Coil Circuit Open

Quick Answer

The B1303 diagnostic trouble code for Mercury vehicles indicates a problem with the Accessory Delay Relay Coil Circuit being open. Common causes include Faulty Accessory Delay Relay, Damaged wiring or connectors in the relay circuit, Corrosion or loose connections in the electrical system. 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 Mercury indicates Accessory Delay Relay Coil Circuit Open.
Common causes
Common causes include Faulty Accessory Delay Relay, Damaged wiring or connectors in the relay circuit, Corrosion or loose connections in the electrical system.
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.
Table of contents Created and updated by William Orellana on Sep 14, 2024
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Code B1303 Mercury Description

The B1303 diagnostic trouble code for Mercury vehicles indicates a problem with the Accessory Delay Relay Coil Circuit being open. The Accessory Delay Relay is responsible for controlling the power to various accessories in the vehicle, such as the power windows, radio, and interior lights. When the circuit is open, it means that there is a break in the electrical connection, preventing the relay from functioning properly. This can lead to a variety of issues with the vehicle's electrical systems, affecting the convenience and functionality of these accessories.

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

Common Causes of B1303 Mercury

  1. Faulty Accessory Delay Relay.
  2. Damaged wiring or connectors in the relay circuit.
  3. Corrosion or loose connections in the electrical system.
  4. Electrical short circuit in the relay circuit.
  5. Issues with the vehicle's battery or charging system affecting the relay operation.

Symptoms of B1303 Mercury

  1. Inoperative power windows or sunroof.
  2. Interior lights not turning on or staying on.
  3. Radio or entertainment system not functioning.
  4. Delayed or erratic operation of accessories.
  5. Dashboard warning light indicating an issue with the accessory delay relay.

How to Fix B1303 Mercury

  1. Begin by diagnosing the specific cause of the open circuit, using a multimeter to test the relay, wiring, and connectors for continuity.
  2. Replace the faulty Accessory Delay Relay if it is determined to be the cause of the issue.
  3. Inspect and repair any damaged wiring or connectors in the relay circuit.
  4. Clean and secure any corroded or loose connections in the electrical system.
  5. Test the repaired circuit to ensure proper operation of the accessories and reset the diagnostic trouble code.

Cost to Fix B1303 Mercury

The typical repair costs for addressing a B1303 code related to the Accessory Delay Relay Coil Circuit Open can range from $100 to $300, including parts and labor. However, it is important to note that the actual cost may vary depending on the specific diagnosis time and labor rates at auto repair shops. Rates can be influenced by factors such as the location of the repair shop, the make and model of the vehicle, and the type of engine. It is advisable to check with local repair shops to obtain a more accurate estimate based on your individual circumstances.

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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 B1303 Mercury Code

1. What are the common symptoms of OBDII code B1303 in a Mercury related to the Accessory Delay Relay Coil Circuit Open?

- Common symptoms may include accessories not functioning properly, such as delayed or non-responsive power windows, radio, or interior lights.

2. What are some possible causes of the Accessory Delay Relay Coil Circuit Open code B1303 in a Mercury?

- Possible causes could include a faulty accessory delay relay, damaged wiring or connectors in the circuit, or a malfunctioning control module.

3. How can I diagnose the Accessory Delay Relay Coil Circuit Open code B1303 in my Mercury?

- Diagnosis typically involves using a scan tool to retrieve the specific trouble code, inspecting the wiring and connectors for damage, and testing the accessory delay relay for proper functionality.

4. Can I still drive my Mercury with the B1303 code for the Accessory Delay Relay Coil Circuit Open?

- It is generally safe to drive your vehicle with this code, but it is recommended to address the issue promptly to ensure proper operation of the affected accessories.

5. What are some repair tips for fixing the Accessory Delay Relay Coil Circuit Open code B1303 in a Mercury?

- Repair tips may include checking and replacing any damaged wiring or connectors, testing and replacing the accessory delay relay if necessary, and ensuring proper connection to the control module.

6. Is it possible to reset the B1303 code in a Mercury without fixing the underlying issue?

- While you can clear the code using a scan tool, it is important to address the root cause of the problem to prevent the code from reoccurring.

7. Are there any common mistakes to avoid when diagnosing the Accessory Delay Relay Coil Circuit Open code B1303 in a Mercury?

- Common mistakes include overlooking damaged wiring, improperly testing the accessory delay relay, and neglecting to check the control module for faults.

8. How much does it typically cost to repair the B1303 code related to the Accessory Delay Relay Coil Circuit Open in a Mercury?

- The cost of repair can vary depending on the specific cause of the issue, but it may involve expenses for parts and labor, ranging from a few hundred to a few thousand dollars.

9. Can a DIY enthusiast fix the B1303 code related to the Accessory Delay Relay Coil Circuit Open in a Mercury?

- While some DIY enthusiasts may be able to diagnose and repair this issue, it is recommended to have the necessary tools, knowledge, and experience to work on automotive electrical systems safely and effectively.

10. How long does it typically take to repair the B1303 code related to the Accessory Delay Relay Coil Circuit Open in a Mercury?

- The repair time can vary depending on the extent of the issue and the expertise of the technician, but it may take anywhere from a few hours to a full day to complete the repair.

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