The B1402 code refers to a problem with the driver power window in a vehicle. It indicates an issue with the Front Electronics Module (FEM) and its control over the window regulator. Symptoms of this code may include the driver power window not working properly, such as not being able to open or close the window.
Causes of the B1402 code can include a malfunctioning driver power window regulator electric motor, a faulty master window regulator control switch, or a defective FEM.
To fix the issue, it is recommended to first diagnose the problem by checking the electrical connections and components related to the driver power window. This may involve inspecting the motor, switch, and FEM for any signs of damage or malfunction. If any faulty parts are found, they should be replaced accordingly.
Additionally, clearing the code and resetting the system may resolve the issue. If the problem persists, it is advised to seek professional assistance for further diagnosis and repair.
What does it mean
The B1402 code indicates a problem with the driver power window motor. Possible causes include a faulty motor or control switch, or a problem with the Front Electronics Module.
To diagnose the code, inspect the wiring and connectors for damage, and check for broken or corroded pins.
Costs to diagnose will vary.
what are the symptoms
What are the symptoms of the B1402 code?
The B1402 code may cause the engine light or service engine soon warning light to turn on.
To diagnose this code, you can follow these steps:
- Check for possible causes like a faulty driver power window regulator electric motor, a faulty master window regulator control switch, a faulty front electronics module (FEM), an open or shorted master window regulator control switch harness, or a poor electrical connection in the master window regulator control switch circuit.
- Visually inspect the wiring harness and connectors for any signs of damage or corrosion.
- Look for any damaged components, such as broken or bent connector pins.
What are the causes
Possible causes of the B1402 code can include the following:
- The driver power window regulator electric motor may be faulty.
- The master window regulator control switch may be faulty.
- The front electronics module (FEM) could be faulty.
- There might be an open or shorted harness in the master window regulator control switch.
- There could be a poor electrical connection in the master window regulator control switch circuit.
When diagnosing the B1402 code, it is important to avoid making these common diagnosis mistakes:
- Not checking the power window regulator electric motor for faults.
- Overlooking the master window regulator control switch as a potential cause.
- Failing to inspect the front electronics module (FEM) for malfunctions.
- Ignoring the possibility of an open or shorted harness or poor electrical connection in the master window regulator control switch circuit.
What Tools are Needed to diagnose
To diagnose the B1402 code, you will need specific diagnostic tools. Here are the tools you need:
- OBD-II Scanner: This tool is necessary to read and retrieve the B1402 code from the vehicle's onboard computer system. It provides important information about the problem and helps identify the exact cause.
- Multimeter: A multimeter is used to measure voltage, resistance, and continuity in electrical circuits. It can be helpful in checking the power supply, wiring, and components related to the driver power window system.
- Wiring Diagrams: Access to the vehicle's wiring diagrams is crucial for understanding the electrical connections and identifying any issues with the wiring harnesses or connectors.
- Inspection Light: An inspection light or flashlight is needed to visually inspect the wiring harnesses, connectors, and components for signs of damage, corrosion, loose connections, or broken pins.
When diagnosing the B1402 code, it's important to avoid common pitfalls such as overlooking simple issues like loose connections, not using the appropriate diagnostic tools, and neglecting to check the entire electrical system related to the driver power window.
Following proper diagnostic techniques and thoroughly inspecting all components will help avoid misdiagnosis and unnecessary repairs.
How to fix Step by Step
Step 1: Begin by visually inspecting the wiring harness and connectors associated with the driver power window system. Look for any signs of damage or corrosion.
Step 2: Check the driver power window regulator electric motor for any faults. Test its functionality to ensure it is operating properly.
Step 3: Inspect the master window regulator control switch and its harness for any open or short circuits. Look for any broken, bent, pushed out, or corroded connector pins.
Step 4: If necessary, test the front electronics module (FEM) to ensure it is functioning correctly. This module controls the driver power window system.
Step 5: During the inspection and testing process, be cautious of common mistakes such as overlooking damaged components or not thoroughly checking the electrical connections.
What are the Common Diagnosis Mistakes
Common Mistakes When Diagnosing the B1402 Code for the Driver Power Window System:
- Not Checking the Motor:
Many times, the electric motor in the driver power window regulator is overlooked, but it can actually be a common cause of the B1402 code. It's important to thoroughly inspect the motor for any faults or failures.
- Neglecting the Control Switch:
The master window regulator control switch is crucial for the proper functioning of the driver power window. It's essential to ensure that the switch is working correctly and not causing any issues.
- Overlooking the Front Electronics Module (FEM):
The FEM is responsible for reading the window regulator control switch and controlling the window motor. It's important to carefully examine this module for any malfunctions or faults.
- Not Inspecting the Wiring:
Faulty or damaged wiring can also trigger the B1402 code. It's crucial to visually inspect the wiring harness and connectors for any signs of damage or poor electrical connections.
Tips for Diagnosing the B1402 Code:
- Thoroughly inspect all components related to the driver power window system, including the motor, control switch, FEM, and wiring.
- Use a diagnostic scanner to retrieve and analyze any additional trouble codes that may be present.
- Perform a visual inspection of the window track, regulator, and glass weatherstrips for any binding or obstruction.
- Ensure that all connectors are securely connected and free from corrosion or damage.
What is the Repair Cost
The cost of repairing the B1402 code for the driver power window system can vary depending on factors such as:
- Location
- Vehicle make and model
- Engine type
To ensure an accurate repair cost, it is recommended to consult with professional auto repair shops that consider these factors and have expertise in diagnosing and repairing the B1402 code effectively.
Can I drive safely with this code?
It is not safe to drive with the B1402 code present.
While it does not directly affect drivability, it can lead to issues with the driver's ability to control the power window.
This can pose safety risks, especially in emergency situations.
It is important to diagnose and repair the B1402 code for safe and reliable operation of the vehicle.
Conclusion
In conclusion, the B1402 code indicates a problem with the driver power window in a vehicle, specifically with the Front Electronics Module (FEM) and its control over the window regulator.
This code can be caused by various factors such as a faulty motor, control switch, or FEM, as well as issues with the wiring harness or electrical connections.
Proper diagnosis and inspection of these components are necessary to effectively address and fix the issue.