WOMS
B code body Medium severity

B1350 Heated Backlite Relay Short To Ground

The OBD2 code B1350 indicates a short circuit to ground in the heated backlite relay circuit, which may affect the operation of the rear window defroster

Definition

The OBD2 code B1350 indicates a short circuit to ground in the heated backlite relay circuit, which may affect the operation of the rear window defroster

Common causes

  • Faulty heated backlite relay
  • Shorted wiring or connectors
  • Damaged or corroded ground connections
  • Malfunctioning control module
  • Faulty heated backlite element

Common misdiagnoses

  • Faulty heated backlite relay
  • Shorted wiring or connectors
  • Defective heated backlite element
  • Malfunctioning body control module (BCM)
  • Issues with the power supply circuit
  • Grounding problems in the circuit
  • Faulty switches or controls related to the heated backlite

Troubleshooting steps

  1. 1. Understand the Code

    B1350 typically refers to a problem with the heated backlite (rear window defroster) relay circuit, indicating that there is a short to ground somewhere in the system

  2. 2. Visual Inspection

    Check Wiring and Connectors: Inspect the wiring harness and connectors associated with the heated backlite relay for any signs of damage, corrosion, or loose connections

  3. 3. Look for Shorts

    Check for any exposed wires that may be touching the vehicle's chassis or other components, which could cause a short to ground

  4. 4. Check the Relay

    Test the Relay: Remove the heated backlite relay and test it using a multimeter. Ensure that it operates correctly and that the contacts are not stuck or damaged

  5. 5. Replace if Necessary

    If the relay is faulty, replace it with a new one

  6. 6. Inspect the Circuit

    Use a Multimeter: With the relay removed, use a multimeter to check for continuity in the circuit. Look for any unexpected continuity to ground that could indicate a short

  7. 7. Check Voltage

    With the ignition on, check for the correct voltage at the relay socket. If there is no voltage, trace back to find where the power is lost

  8. 8. Check the Heated Backlite Element

    Inspect the Defroster Grid: Look for any breaks or damage in the defroster grid on the rear window. A damaged grid can cause a short to ground

  9. 9. Test the Element

    If possible, test the resistance of the defroster grid. If it shows a short (very low resistance), it may need to be repaired or replaced

  10. 10. Scan for Additional Codes

    Check for Other Codes: Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues

  11. 11. Clear the Code

    After performing the above checks and repairs, clear the code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns

  12. 12. Consult a Professional

    If the issue persists after following these steps, it may be necessary to consult a professional mechanic or an automotive electrician for further diagnosis.Additional Tips: - Always refer to the vehicle’s service manual for specific wiring diagrams and specifications. - Ensure that you have the proper tools and safety equipment when working on electrical systems. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1350 code