B1408 – Driver Power Window Up Circuit Short To Battery

The ODBII code B1408 indicates a short circuit in the driver power window up circuit, meaning there is an unintended connection to the battery, causing the window to malfunction.

The severity of ODBII code B1408 is moderate.

Common Causes For: B1407 Driver Power Window Up Circuit Open

• Shorted wiring or connectors
• Faulty power window switch
• Defective power window motor
• Damaged or frayed insulation on wires
• Corroded connectors
• Malfunctioning body control module (BCM)
• Improper installation of aftermarket accessories

Common misdiagnosis for B1408 Driver Power Window Up Circuit Short To Battery

• Faulty window switch
• Defective power window motor
• Wiring harness issues
• Malfunctioning body control module (BCM)
• Shorted or damaged wiring
• Incorrectly installed or damaged window regulator
• Battery or charging system problems

Common Troubleshooting Steps

The OBD-II code B1408 indicates a problem with the driver power window up circuit, specifically a short to battery. Here are some common troubleshooting steps to diagnose and resolve this issue:

• Visual Inspection:
• Check the wiring and connectors associated with the driver power window circuit for any visible damage, fraying, or corrosion.
• Inspect the power window switch for any signs of wear or damage.
• Check Fuses:
• Locate the fuse box and check the fuses related to the power windows. Replace any blown fuses and see if the issue persists.
• Test the Power Window Switch:
• Use a multimeter to test the power window switch for continuity. If the switch is faulty, it may need to be replaced.
• Inspect the Window Motor:
• Test the power window motor by applying direct battery voltage to it. If the motor does not operate, it may be defective and require replacement.
• Check for Shorts:
• Use a multimeter to check for shorts in the wiring harness. Look for continuity between the power window circuit and ground or battery voltage where it shouldn’t exist.
• Examine Ground Connections:
• Ensure that all ground connections related to the power window circuit are clean and secure. A poor ground can cause erratic behavior.
• Scan for Additional Codes:
• Use an OBD-II scanner to check for any additional trouble codes that may provide more context to the issue.
• Inspect the Body Control Module (BCM):
• If all other components check out, the issue may lie within the BCM. Check for any software updates or faults in the module.
• Wiring Diagrams:
• Refer to the vehicle’s wiring diagrams to trace the circuit and identify any potential issues in the wiring or connections.
• Consult Repair Manual:
• If necessary, consult the vehicle’s repair manual for specific troubleshooting steps related to the B1408 code for your make and model. 1
• Professional Diagnosis:
• If the problem persists after performing these steps, consider seeking help from a professional mechanic or automotive technician who can perform more advanced diagnostics. By following these steps, you should be able to identify and resolve the issue related to the B1408 code.