B1235 – Window Feedback Failure

The ODBII code B1235 indicates a Window Feedback Failure, which means there is a problem with the window’s position sensor or feedback system, preventing the vehicle’s control module from accurately determining the window’s status.

The severity of ODBII code B1235 Window Feedback Failure is moderate.

Common Causes For: B1234 Mirror Switch Invalid Code

• Faulty window motor
• Damaged window regulator
• Poor electrical connections
• Broken or frayed wiring
• Malfunctioning body control module (BCM)
• Obstructed window track
• Incorrectly installed window components
• Low battery voltage or weak battery

Common misdiagnosis for B1235 Window Feedback Failure

• Faulty window motor
• Defective window switch
• Wiring issues or shorts in the window circuit
• Malfunctioning body control module (BCM)
• Incorrectly calibrated window position sensors
• Issues with the power window relay
• Problems with the vehicle’s electrical system or battery
• Software glitches in the vehicle’s control modules

Common Troubleshooting Steps

The OBD-II code B1235 indicates a “Window Feedback Failure,” which typically relates to the power window system in a vehicle. This code suggests that the vehicle’s computer has detected an issue with the feedback signal from the window motor or the window position sensor. Here are some common troubleshooting steps to diagnose and resolve this issue:

• Check for Additional Codes: Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues.
• Inspect the Window Switch: Test the window switch for proper operation. A faulty switch can prevent the window from functioning correctly.
• Check for any signs of damage or corrosion on the switch contacts.
• Examine the Wiring and Connectors: Inspect the wiring harness and connectors associated with the window motor and switch for any signs of damage, fraying, or corrosion.
• Ensure all connections are secure and free from moisture.
• Test the Window Motor: Use a multimeter to test the window motor for proper voltage and operation. If the motor is not receiving power or is faulty, it may need to be replaced.
• If possible, apply direct power to the motor to see if it operates.
• Check the Window Position Sensor: If equipped, inspect the window position sensor for proper operation. This sensor provides feedback to the vehicle’s computer about the window’s position.
• Test the sensor for continuity and proper voltage.
• Inspect the Window Regulator: Check the window regulator for any mechanical issues that may prevent the window from moving smoothly.
• Ensure that the window is not binding or obstructed in its track.
• Reset the System: Sometimes, clearing the code and resetting the system can resolve temporary glitches. Use the OBD-II scanner to clear the code and see if it returns.
• Check for Ground Issues: Ensure that the ground connections for the window motor and related components are secure and free from corrosion.
• Consult Wiring Diagrams: Refer to the vehicle’s service manual for wiring diagrams to trace the circuit and identify any potential issues.
• Professional Diagnosis: If the issue persists after performing the above steps, consider seeking help from a professional mechanic or automotive technician who can perform more advanced diagnostics.Conclusion Troubleshooting a B1235 code involves a systematic approach to check the components involved in the window operation. By following these steps, you can identify and resolve the underlying issue causing the window feedback failure.