AutoCodes – Mercury – B1402 Mercury

B1402 Mercury Code - Driver Power Window Down Switch Circuit Failure

Quick Answer

The driver power window is controlled by the Front Electronics Module (FEM). Common causes include Driver Power Window Regulator Electric Motor, Faulty Master Window Regulator Control Switch, Faulty Front Electronics Module (FEM). 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 Driver Power Window Regulator Electric Motor, Faulty Master Window Regulator Control Switch, Faulty Front Electronics Module (FEM).
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.

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Code Popularity 697

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 04, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1402 Mercury Description

The driver power window is controlled by the Front Electronics Module (FEM). The driver power window regulator control switch and motor are hardwired directly to the FEM. The FEM will read the window regulator control switch actuation and provide the corresponding output to the window motor. If one-touch operation is selected, the FEM powers the driver window motor for seven seconds or until the FEM senses the motor is stalled. If the window track, regulator or glass weatherstrips cause the glass to bind, the FEM may interpret this as a motor stalled condition and halt motor operation.

OBDII Code B1402 Mercury - Driver Power Window Down Switch Circuit Failure - AutoCodes.com — B1402 Mercury Code - Driver Power Window Down Switch Circuit Failure

What does this mean?

What are the Possible Causes of the DTC B1402 Mercury?

Driver Power Window Regulator Electric Motor
Faulty Master Window Regulator Control Switch
Faulty Front Electronics Module (FEM)
Master Window Regulator Control Switch harness is open or shorted
Master Window Regulator Control Switch circuit poor electrical connection

How to Fix the DTC B1402 Mercury?

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 B1402 Mercury 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 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.