B1420 – Passenger Power Window Motor Circuit Short To Battery

The ODBII code B1420 indicates a short circuit in the passenger power window motor circuit, meaning there is an unintended connection to the battery, which can cause the window motor to malfunction.

The severity of ODBII code B1420 is moderate.

Common Causes For: B1419 Passenger Power Window Motor Circuit Open

• Shorted wiring or connectors
• Faulty power window motor
• Malfunctioning window switch
• Damaged or corroded ground connections
• Faulty body control module (BCM)
• Improper installation or aftermarket modifications

Common misdiagnosis for B1420 Passenger Power Window Motor Circuit Short To Battery

• Faulty window switch
• Wiring harness issues
• Defective power window motor
• Body control module (BCM) failure
• Ground connection problems
• Blown fuses
• Incorrectly installed aftermarket accessories

Common Troubleshooting Steps

When dealing with an OBD-II code B1420, which indicates a “Passenger Power Window Motor Circuit Short To Battery,” there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. Here’s a structured approach:

• Visual Inspection: **Wiring and Connectors: Check the wiring harness and connectors related to the passenger power window motor for any signs of damage, fraying, or corrosion.
• **Ground Connections: Ensure that all ground connections are secure and free of corrosion.
• Check the Power Window Switch: **Functionality: Test the passenger power window switch to ensure it is functioning correctly. A faulty switch can cause a short circuit.
• **Continuity Test: Use a multimeter to check for continuity in the switch when pressed.
• Inspect the Power Window Motor: **Motor Condition: Check the power window motor for any signs of damage or wear. If the motor is shorted internally, it may need to be replaced.
• **Bench Test: If possible, remove the motor and test it outside the vehicle to see if it operates correctly.
• Check for Short Circuits: **Wiring Inspection: Look for any areas where the wiring may be pinched, frayed, or in contact with metal surfaces that could cause a short to battery.
• **Multimeter Testing: Use a multimeter to check for continuity between the power window motor circuit and the battery positive terminal. A reading indicates a short.
• Inspect the Circuit: **Fuses and Relays: Check the fuses and relays associated with the power window system. A blown fuse may indicate a short circuit.
• **Circuit Integrity: Use a wiring diagram to trace the circuit from the switch to the motor and check for any breaks or shorts.
• Scan for Additional Codes: **OBD-II Scanner: Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues.
• Repair or Replace Components: **Repair Wiring: If any damaged wiring or connectors are found, repair or replace them as necessary.
• **Replace Faulty Parts: If the power window motor or switch is determined to be faulty, replace them.
• Clear Codes and Test Drive: **Clear Codes: After repairs, clear the trouble codes using an OBD-II scanner.
• **Test Operation: Test the passenger power window to ensure it operates correctly and monitor for any reoccurrence of the code.
• Consult a Professional: If the issue persists after performing these steps, it may be beneficial to consult a professional mechanic or automotive technician for further diagnosis. By following these steps, you should be able to identify and resolve the issue related to the B1420 code. Always ensure safety precautions are taken when working with electrical systems in vehicles.