B1720 – Seat Driver Forward Switch Circuit Short To Ground

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The ODBII code B1720 indicates a malfunction in the driver’s seat forward switch circuit, specifically that there is a short to ground, which means the circuit is unintentionally connected to the ground, causing it to malfunction.

The severity of ODBII code B1720 is generally considered moderate.

Common Causes For: B1719 Seat Driver Forward Switch Circuit Short To Battery

  • Damaged wiring or connectors
  • Faulty seat switch
  • Shorted seat switch circuit
  • Grounding issues
  • Faulty seat control module
  • Corroded connections

Common misdiagnosis for B1720 Seat Driver Forward Switch Circuit Short To Ground

  • Faulty seat switch
  • Wiring issues or shorts in the harness
  • Faulty seat control module
  • Incorrectly diagnosed airbag system issues
  • Misinterpretation of related codes
  • Faulty connectors or terminals
  • Issues with the body control module (BCM)

Common Troubleshooting Steps

When dealing with an OBD-II code B1720, which indicates a “Seat Driver Forward Switch Circuit Short to Ground,” there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. Here’s a structured approach:

  • Check the Code: Use an OBD-II scanner to confirm the presence of the B1720 code. Clear the code and see if it returns after a short drive.
  • Visual Inspection: Inspect the wiring and connectors associated with the driver’s seat switch. Look for:
  • Damaged or frayed wires.
  • Corroded or loose connectors.
  • Signs of wear or shorts in the wiring harness.
  • Check the Seat Switch: Remove the seat switch and inspect it for any physical damage.
  • Test the switch for continuity using a multimeter. Ensure that it operates correctly when pressed.
  • Inspect the Seat Wiring Harness: Follow the wiring harness from the seat switch to the main harness. Look for any signs of pinching, rubbing, or damage that could cause a short to ground.
  • Test for Short to Ground: With the multimeter, check for continuity between the seat switch circuit and ground. If there is continuity, it indicates a short to ground somewhere in the circuit.
  • Check the Power Supply: Verify that the seat switch is receiving the correct voltage. Use a multimeter to check for power at the switch connector when the ignition is on.
  • Inspect Related Components: If the issue persists, check other components in the circuit, such as:
  • The seat control module (if equipped).
  • Any related fuses or relays.
  • Repair or Replace: Based on your findings, repair any damaged wiring or connectors. If the switch or any other component is faulty, replace it.
  • Clear Codes and Test Drive: After making repairs, clear the OBD-II codes and take the vehicle for a test drive to see if the code returns.
  • Consult Service Manual: If the problem persists, consult the vehicle’s service manual for specific wiring diagrams and troubleshooting procedures related to the seat switch circuit.1
  • Professional Help: If you are unable to resolve the issue, consider seeking help from a professional mechanic or an automotive electrician who can perform more advanced diagnostics. By following these steps, you should be able to identify and resolve the issue related to the B1720 code.

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