B1235 – OBD-II DTC

OBD-II DTC B1235 – Window Feedback Failure

DTC B1235 meaning

DTC B1235 refers to a “Window Feedback Failure” in the On-Board Diagnostics II (OBD-II) system. This code indicates that the vehicle’s power window system is not receiving the expected feedback from the window motor or the window position sensor. The system is designed to monitor the position of the window to ensure it operates correctly and safely.

DTC B1235 symptoms

Common symptoms associated with DTC B1235 may include:

• Power windows that do not operate at all.
• Windows that move erratically or stop midway.
• Inability to auto-up or auto-down the windows.
• Warning lights illuminated on the dashboard.

DTC B1235 causes

Several factors can lead to the occurrence of DTC B1235, including:

• Faulty window motor or regulator.
• Damaged or frayed wiring in the window circuit.
• Defective window position sensor.
• Issues with the power window switch.
• Corrosion or poor connections in the electrical system.

DTC B1235 seriousness

DTC B1235 can be considered a moderate issue. While it may not affect the vehicle’s overall drivability, it can lead to safety concerns if the windows fail to operate properly. Additionally, it may prevent the driver from closing the windows in adverse weather conditions, which can lead to further complications.

How to diagnose DTC B1235

To diagnose DTC B1235, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the DTC.
2. Inspect the power window system for visible damage or wear.
3. Check the window motor and regulator for proper operation.
4. Test the window position sensor for accurate feedback.
5. Examine the wiring and connectors for corrosion or loose connections.
6. Verify the functionality of the power window switch.

How to fix DTC B1235 step-by-step instructions

To fix DTC B1235, follow these steps:

1. Repair or replace any damaged wiring or connectors in the window circuit.
2. If the window motor or regulator is faulty, replace it with a new unit.
3. Replace the window position sensor if it is not functioning correctly.
4. Test the power window switch and replace it if necessary.
5. Clear the DTC using an OBD-II scanner and test the window operation.

How to erase DTC B1235

To erase DTC B1235, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Navigate to the “Erase Codes” or “Clear DTCs” option on the scanner.
4. Confirm the action to clear the trouble codes.
5. Disconnect the scanner and start the vehicle to ensure the code does not return.

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