B1423 – Power Window RR Motor Circuit Open

The ODBII code B1423 indicates an open circuit in the power window motor for the right rear window, suggesting a potential issue with the wiring or the motor itself.

The severity of ODBII code B1423 is moderate.

Common Causes For: B1422 Power Window RR Motor Circuit Failure

• Faulty power window motor
• Open circuit in wiring
• Damaged connectors
• Blown fuse
• Faulty window switch
• Ground connection issues

Common misdiagnosis for B1423 Power Window RR Motor Circuit Open

• Faulty power window switch
• Bad wiring or connectors
• Defective body control module (BCM)
• Malfunctioning window regulator
• Blown fuse
• Incorrectly diagnosed motor failure
• Issues with the door harness
• Problems with the vehicle’s central locking system

Common Troubleshooting Steps

When dealing with an OBD-II code B1423, which indicates a “Power Window RR Motor Circuit Open,” you can follow these common troubleshooting steps to diagnose and potentially resolve the issue:

• Check the Vehicle’s Manual: Refer to the vehicle’s service manual for specific information related to the power window system and wiring diagrams.
• Visual Inspection:
• Inspect the wiring harness and connectors related to the rear right power window motor for any signs of damage, corrosion, or loose connections.
• Check the power window switch for any physical damage or wear.
• Test the Power Window Switch:
• Use a multimeter to test the power window switch for continuity. Ensure that it is functioning correctly when pressed in both directions (up and down).
• Inspect the Power Window Motor:
• Remove the door panel to access the rear right power window motor.
• Check the motor for any visible damage or obstructions.
• Test the motor directly by applying power to it (using a known good power source) to see if it operates.
• Check for Power and Ground:
• Use a multimeter to check for voltage at the power window motor connector when the switch is activated. You should see battery voltage (typically around 12V).
• Check for a good ground connection at the motor. If there is no power or ground, trace the wiring back to the switch and the fuse box.
• Inspect Fuses and Relays:
• Check the fuse associated with the power window circuit. Replace any blown fuses.
• If applicable, check the relay for the power window system to ensure it is functioning properly.
• Scan for Additional Codes:
• Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues.
• Check for Short Circuits:
• Inspect the wiring for any signs of short circuits or breaks that could cause an open circuit condition.
• Test the Body Control Module (BCM):
• If all other components check out, the issue may lie within the BCM. Ensure that it is functioning correctly and that there are no software issues.
• Clear the Code and Test Drive:
• After performing repairs, clear the trouble code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns. If you are not comfortable performing these steps or if the issue persists after troubleshooting, it may be best to consult a professional mechanic for further diagnosis and repair.