WOMS
B code body Medium severity

B1650 Seat Driver Recline Forward Circuit Short To Ground

The OBD2 code B1650 indicates a malfunction in the driver's seat recline mechanism, specifically that the forward circuit is shorted to ground, which means there is an unintended connection to the ground that is causing...

Definition

The OBD2 code B1650 indicates a malfunction in the driver's seat recline mechanism, specifically that the forward circuit is shorted to ground, which means there is an unintended connection to the ground that is causing the circuit to malfunction

Common causes

  • Shorted wiring or connectors
  • Faulty seat recline motor
  • Damaged seat control switch
  • Grounding issues in the circuit
  • Corroded or damaged connectors
  • Faulty body control module (BCM)

Common misdiagnoses

  • Faulty seat recline motor
  • Damaged wiring harness
  • Malfunctioning seat position sensor
  • Defective body control module (BCM)
  • Issues with the power seat switch
  • Short circuit in the seat wiring
  • Faulty ground connection
  • Incorrectly installed or loose connectors

Troubleshooting steps

  1. 1. Verify the Code

    Use an OBD-II scanner to confirm the presence of the B1650 code

  2. 2. Clear the code and see if it returns after a short drive cycle

  3. 3. Inspect the Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors associated with the driver seat recline mechanism for any visible damage, fraying, or corrosion

  4. 4. Connector Condition

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

  5. 5. Check for Shorts to Ground

    Multimeter Testing: Use a multimeter to check for continuity between the recline circuit wire and ground. A short to ground will show continuity

  6. 6. Inspect Ground Points

    Ensure that all ground points related to the seat and recline mechanism are clean and secure

  7. 7. Test the Seat Recline Motor

    Motor Functionality: If accessible, test the seat recline motor by applying direct power to see if it operates correctly

  8. 8. Resistance Check

    Measure the resistance of the motor windings to ensure they are within specifications

  9. 9. Check the Seat Control Switch

    Switch Functionality: Test the seat recline switch for proper operation. A faulty switch can cause incorrect signals to be sent to the motor

  10. 10. Continuity Test

    Check for continuity in the switch when pressed

  11. 11. Inspect the Body Control Module (BCM)

    BCM Functionality: If the wiring and motor are functioning correctly, the issue may lie within the BCM. Check for any software updates or known issues with the BCM

  12. 12. Diagnostic Testing

    If possible, perform a diagnostic test on the BCM to check for any faults

  13. 13. Look for Related Codes

    Check for any other related trouble codes that may provide additional context or indicate a broader issue

  14. 14. 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

  15. 15. Repair or Replace Faulty Components

    Based on your findings, repair any damaged wiring, replace faulty connectors, or replace the seat recline motor or switch as necessary

  16. 16. Clear Codes and Test Drive

    After making repairs, clear the codes and take the vehicle for a test drive to ensure the issue is resolved and the code does not return.1

  17. 17. Seek Professional Help

    If the problem persists after following these steps, consider seeking assistance from a professional mechanic or automotive technician who has experience with electrical systems. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1650 code