B1236 – Window Feedback Loss of Signal

The ODBII code B1236 indicates a “Window Feedback Loss of Signal,” which means that the vehicle’s window control module is not receiving the expected feedback signal from the window motor or position sensor, indicating a potential issue with the window’s operation or wiring.

The severity of ODBII code B1236 Window Feedback Loss of Signal is moderate.

Common Causes For: B1235 Window Feedback Failure

• Faulty window motor
• Damaged window regulator
• Broken or frayed wiring
• Poor electrical connections
• Malfunctioning body control module (BCM)
• Defective window switch
• Obstruction in the window track
• Low battery voltage or weak battery

Common misdiagnosis for B1236 Window Feedback Loss of Signal

• Faulty window motor
• Damaged window regulator
• Wiring issues or shorts
• Faulty body control module (BCM)
• Defective switch assembly
• Poor ground connections
• Software or calibration issues in the control module

Common Troubleshooting Steps

The OBD-II code B1236, which indicates “Window Feedback Loss of Signal,” typically relates to issues with the power window system in a vehicle. This code suggests that the vehicle’s control module is not receiving the expected feedback from the window motor or switch. Here are some common troubleshooting steps to diagnose and resolve this issue:

• Check the Window Switch:
• Inspect the window switch for any signs of damage or wear.
• Test the switch for continuity using a multimeter. If the switch is faulty, it may need to be replaced.
• Inspect Wiring and Connectors:
• Examine the wiring harness and connectors associated with the window motor and switch for any signs of damage, corrosion, or loose connections.
• Repair or replace any damaged wires or connectors.
• Test the Window Motor:
• Use a multimeter to check the voltage at the window motor when the switch is activated. If there is no voltage, the issue may lie with the switch or wiring.
• If voltage is present but the motor does not operate, the motor may be faulty and require replacement.
• Check for Obstructions:
• Ensure that there are no physical obstructions preventing the window from moving. Sometimes, debris or foreign objects can block the window’s path.
• Inspect the Body Control Module (BCM):
• The BCM may be responsible for controlling the window operation. Check for any fault codes in the BCM and ensure it is functioning correctly.
• If necessary, reprogram or replace the BCM.
• Clear Codes and Test:
• After performing the above checks and repairs, clear the OBD-II codes using a scan tool.
• Test the window operation to see if the code reappears.
• 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 these steps, consider seeking assistance from a professional mechanic or automotive technician who can perform more advanced diagnostics. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1236 code.