AutoCodes – Generic – B1406

B1406 Code - Driver Power Window Down Circuit Short To Ground

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: B1406 indicates Driver Power Window Down Circuit Short To Ground.
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 9,205

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 B1406 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 B1406 - Driver Power Window Down Circuit Short To Ground - AutoCodes.com — B1406 Code - Driver Power Window Down Circuit Short To Ground

What does this mean?

What are the Possible Causes of the DTC B1406?

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 B1406?

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 B1406 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.

Need more information about the B1406 code?

Need more information on how to fix the B1406 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1406 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1406 Ford — Driver Power Window Down Circuit Short To Ground
B1406 Lincoln — Driver Power Window Down Circuit Short To Ground
B1406 Mercury — Driver Power Window Down Circuit Short To Ground

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 B1406 Code

1. What are the common symptoms of OBDII code B1406?

The common symptoms of OBDII code B1406 include the driver power window being stuck in the down position, the window not responding to the control switch, or the window moving intermittently.

2. What can cause the OBDII code B1406 to trigger?

The code B1406 is triggered when there is a short to ground in the driver power window circuit. This can be caused by damaged wiring, a faulty window switch, or a malfunctioning window motor.

3. How can I diagnose the cause of OBDII code B1406?

To diagnose the cause of code B1406, you can use a multimeter to test the continuity of the wiring, inspect the window switch for any visible damage, and check the window motor for proper operation.

4. What is the repair procedure for OBDII code B1406?

The repair procedure for code B1406 involves locating and repairing the short to ground in the driver power window circuit. This may require repairing or replacing damaged wiring, replacing the window switch, or replacing the window motor.

5. Can I drive my vehicle with OBDII code B1406 active?

It is not recommended to drive your vehicle with code B1406 active, as the driver power window may not function properly, posing a safety risk. It is best to address the issue promptly to ensure the window operates correctly.

6. How much does it typically cost to repair OBDII code B1406?

The cost to repair code B1406 can vary depending on the underlying cause of the issue. Repair costs may include labor charges for diagnosis and repair, as well as the cost of any replacement parts needed, such as wiring harnesses, switches, or window motors.

7. Are there any DIY repair tips for fixing OBDII code B1406?

While diagnosing and repairing code B1406 may require some technical knowledge, you can start by checking the fuses related to the power windows, inspecting the wiring for visible damage, and testing the window switch for proper functionality.

8. Can a faulty window motor cause OBDII code B1406?

Yes, a faulty window motor can cause code B1406 if it develops a short to ground in the power window circuit. If the motor is malfunctioning, it may need to be replaced to resolve the issue.

9. Will resetting the OBDII code B1406 make the issue go away?

Resetting the code B1406 may temporarily clear the error code, but if the underlying issue causing the short to ground is not addressed, the code is likely to return. It is important to diagnose and repair the root cause of the problem.

10. How long does it usually take to repair OBDII code B1406?

The time it takes to repair code B1406 can vary depending on the complexity of the issue and the availability of replacement parts. In general, the repair process may take a few hours to complete, but it is recommended to consult a professional for an accurate estimate.