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Engine-Codes – Mercury – B1402 Mercury

B1402 Mercury Code - Driver Power Window Down Switch Circuit Failure

Quick Answer

The B1402 diagnostic trouble code (DTC) for Mercury vehicles indicates a Driver Power Window Down Switch Circuit Failure. Common causes include Faulty power window switch, Wiring harness issues or electrical connections, Malfunctioning window regulator. 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
B1402 Mercury indicates Driver Power Window Down Switch Circuit Failure.
Common causes
Common causes include Faulty power window switch, Wiring harness issues or electrical connections, Malfunctioning window regulator.
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 17, 2024
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Code B1402 Mercury Description

The B1402 diagnostic trouble code (DTC) for Mercury vehicles indicates a Driver Power Window Down Switch Circuit Failure. This code is triggered when the power window switch on the driver's side fails to function properly, preventing the window from being lowered. The power window switch is an essential component that allows the driver to control the movement of the window glass. When this switch circuit fails, it can lead to inconvenience and potential safety hazards for the driver and passengers.

OBDII Code B1402 Mercury - Driver Power Window Down Switch Circuit Failure
B1402 Mercury Code - Driver Power Window Down Switch Circuit Failure

Common Causes of B1402 Mercury

  1. Faulty power window switch.
  2. Wiring harness issues or electrical connections.
  3. Malfunctioning window regulator.
  4. Defective window motor.
  5. Water damage or corrosion affecting the power window switch circuit.

Symptoms of B1402 Mercury

  1. Inability to lower the driver's side window using the power window switch.
  2. Unresponsive or intermittent operation of the power window switch.
  3. Strange noises or grinding sounds when attempting to lower the window.
  4. Window glass gets stuck or moves unevenly when trying to lower it.

How to Fix B1402 Mercury

  1. Begin by diagnosing the specific cause of the issue using a diagnostic scanner to retrieve the B1402 code and testing the power window switch for functionality.
  2. Inspect the wiring harness and electrical connections for any signs of damage, corrosion, or loose connections. Repair or replace as needed.
  3. Test the window regulator and motor to ensure they are functioning correctly. Replace any faulty components.
  4. Replace the driver power window switch if it is determined to be the cause of the circuit failure.
  5. Clear the DTC from the vehicle's computer memory and test the power window switch to verify proper operation.

Cost to Fix B1402 Mercury

The typical repair costs for addressing a Driver Power Window Down Switch Circuit Failure can range from $150 to $400, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check local rates for a more precise estimate. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less for repairs.

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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 B1402 Mercury Code

1. What are the common symptoms of OBDII code B1402 in a Mercury related to the Driver Power Window Down Switch Circuit Failure?

- Common symptoms include the power window not functioning properly or at all, the window getting stuck in one position, or the window operating intermittently.

2. What are the possible causes triggering the OBDII code B1402 in a Mercury for the Driver Power Window Down Switch Circuit Failure?

- The code B1402 can be triggered by issues such as a faulty power window switch, damaged wiring or connectors in the circuit, or a malfunctioning power window motor.

3. How can I diagnose the OBDII code B1402 in my Mercury for the Driver Power Window Down Switch Circuit Failure?

- To diagnose the issue, you may need to visually inspect the power window switch, check the wiring and connectors for any damage, and test the power window motor for proper functionality.

4. Can I repair the OBDII code B1402 in my Mercury related to the Driver Power Window Down Switch Circuit Failure on my own?

- Repairing the issue yourself may be possible if you have some experience with automotive electrical systems. However, it's recommended to consult a professional mechanic for accurate diagnosis and repair.

5. Are there any quick tips for fixing the OBDII code B1402 in a Mercury for the Driver Power Window Down Switch Circuit Failure?

- Quick tips include checking the fuse related to the power window circuit, ensuring all connections are secure, and testing the power window switch for proper operation.

6. How important is it to address the OBDII code B1402 in my Mercury for the Driver Power Window Down Switch Circuit Failure promptly?

- It is important to address the issue promptly as a malfunctioning power window can affect your visibility while driving and compromise the security of your vehicle.

7. Can the OBDII code B1402 in a Mercury related to the Driver Power Window Down Switch Circuit Failure cause any other problems in the vehicle?

- While the code itself may not directly cause other problems, a malfunctioning power window can impact the convenience and safety of operating your vehicle.

8. Is it safe to continue driving my Mercury with the OBDII code B1402 for the Driver Power Window Down Switch Circuit Failure?

- It is generally safe to drive your vehicle with this code, but it is recommended to address the issue as soon as possible to avoid any inconvenience or safety concerns.

9. How much does it typically cost to repair the OBDII code B1402 in a Mercury for the Driver Power Window Down Switch Circuit Failure?

- The cost of repair can vary depending on the extent of the issue and whether you choose to repair it yourself or take it to a professional mechanic. Costs may include parts and labor.

10. Can extreme weather conditions affect the occurrence of the OBDII code B1402 in a Mercury for the Driver Power Window Down Switch Circuit Failure?

- Extreme weather conditions, such as excessive heat or cold, can sometimes exacerbate existing issues with the power window circuit, leading to the triggering of the B1402 code.

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