WOMS
B code body Medium severity

B1972 Passenger Rear Seat Up Switch Circuit Short to Battery

The OBD2 code B1972 indicates a malfunction in the passenger rear seat up switch circuit, specifically that there is a short circuit to the battery, which means the circuit is receiving constant power instead of...

Definition

The OBD2 code B1972 indicates a malfunction in the passenger rear seat up switch circuit, specifically that there is a short circuit to the battery, which means the circuit is receiving constant power instead of functioning normally

Common causes

  • Shorted wiring or connectors
  • Faulty seat switch
  • Damaged seat harness
  • Corroded connectors
  • Malfunctioning power seat module
  • Improper installation or modifications

Common misdiagnoses

  • Faulty passenger rear seat switch
  • Wiring harness issues
  • Short circuit in the seat control module
  • Malfunctioning body control module (BCM)
  • Incorrectly installed or damaged seat components
  • Battery or power supply issues
  • Grounding problems in the circuit

Troubleshooting steps

  1. 1. Verify the Code

    Use an OBD-II scanner to confirm the presence of the B1972 code. Clear the code and see if it returns after a short drive

  2. 2. Inspect the Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors associated with the passenger rear seat up switch. Look for signs of damage, fraying, or corrosion

  3. 3. Connector Check

    Ensure that all connectors are securely attached and free of dirt or moisture

  4. 4. Test the Switch

    Functionality Test: Use a multimeter to test the passenger rear seat up switch. Check for continuity when the switch is activated

  5. 5. Resistance Check

    Measure the resistance across the switch terminals. If the resistance is too low (indicating a short), the switch may be faulty

  6. 6. Check for Short Circuits

    Wiring Inspection: Look for any pinched or damaged wires that could be causing a short to battery voltage

  7. 7. Grounding Issues

    Ensure that the ground connections are secure and not corroded

  8. 8. Inspect Related Components

    Check any related components, such as the seat control module or any other switches that may be part of the same circuit. A fault in one component can affect the entire circuit

  9. 9. Test the Circuit

    Use a multimeter to check for voltage at the switch connector. Compare the readings to the vehicle’s wiring diagram to ensure they are within specifications

  10. 10. Check for continuity between the switch and the control module

  11. 11. Check for Faulty Modules

    If the switch and wiring are in good condition, the issue may lie within the seat control module. If possible, test or replace the module to see if it resolves the issue

  12. 12. Consult Wiring Diagrams

    Refer to the vehicle’s service manual for wiring diagrams to understand the circuit layout and identify any other components that may be involved

  13. 13. Clear Codes and Test Drive

    After making repairs, clear the codes and take the vehicle for a test drive to see if the code returns

  14. 14. Seek Professional Help

    If the issue persists after following these steps, it may be best to consult a professional mechanic or technician who has experience with automotive electrical systems. By following these steps, you should be able to identify and resolve the issue related to the B1972 code. Always ensure safety precautions are taken when working with electrical systems in vehicles