WOMS
B code body Medium severity

B1728 Seat Driver Rear Up Switch Circuit Short To Ground

The OBD2 code B1728 indicates a malfunction in the driver rear seat's up switch circuit, specifically that there is a short to ground, which means the circuit is unintentionally connected to the ground, causing it to...

Definition

The OBD2 code B1728 indicates a malfunction in the driver rear seat's up switch circuit, specifically that there is a short to ground, which means the circuit is unintentionally connected to the ground, causing it to malfunction

Common causes

  • Damaged wiring or connectors
  • Faulty seat switch
  • Short circuit in the wiring harness
  • Corroded connectors
  • Malfunctioning seat control module
  • Improper installation or modifications
  • Water intrusion or moisture damage

Common misdiagnoses

  • Faulty seat switch
  • Wiring issues or shorts in the harness
  • Malfunctioning seat control module
  • Issues with the body control module (BCM)
  • Faulty connectors or terminals
  • Problems with the power supply to the seat system
  • Incorrectly diagnosed seat motor failure

Troubleshooting steps

  1. 1. Understand the Code

    B1728 typically refers to a problem with the seat adjustment switch circuit, specifically the "up" function for the driver's rear seat. A short to ground means that the circuit is being unintentionally connected to ground, which can cause the switch to malfunction

  2. 2. Visual Inspection

    Wiring and Connectors: Inspect the wiring harness and connectors associated with the seat adjustment switch. Look for frayed wires, corrosion, or loose connections

  3. 3. Switch Condition

    Check the seat switch for any visible damage or wear

  4. 4. Check for Other Codes

    Use an OBD-II scanner to check if there are any other related trouble codes. This can provide additional context for the issue

  5. 5. Test the Switch

    Continuity Test: Disconnect the switch and use a multimeter to check for continuity in the switch. It should show continuity when pressed and none when released

  6. 6. Resistance Check

    Measure the resistance of the switch. If it shows a short (very low resistance) when it should not, the switch may be faulty

  7. 7. Inspect the Circuit

    Wiring Diagram: Refer to the vehicle’s wiring diagram to understand the circuit layout. This will help you identify where the short might be occurring

  8. 8. Check for Shorts

    Use a multimeter to check for shorts to ground in the wiring harness. Disconnect the battery and test the wires for continuity to ground

  9. 9. Check Ground Connections

    Ensure that all ground connections related to the seat adjustment system are clean and secure. A poor ground can sometimes cause erratic behavior

  10. 10. Test the Seat Module (if applicable)

    If the vehicle has a seat control module, it may need to be tested or reset. Check for any software updates or recalls related to the seat control system

  11. 11. Repair or Replace Components

    Based on your findings, repair any damaged wiring or connectors. If the switch is faulty, replace it. If the seat control module is defective, consider replacing it as well

  12. 12. Clear the Code and Test Drive

    After making repairs, clear the trouble codes using the OBD-II scanner. Take the vehicle for a test drive to see if the code returns

  13. 13. Consult a Professional

    If the issue persists after following these steps, it may be best to consult a professional mechanic or an automotive electrician for further diagnosis.Additional Tips: - Always disconnect the battery before working on electrical components to avoid shorts or shocks. - Document any changes or repairs made for future reference. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1728 code