B1770 – Seat Driver Backward Circuit Open

The ODBII code B1770 indicates that there is an open circuit in the driver seat’s backward movement mechanism, meaning the seat cannot move backward due to a fault in the wiring or the motor.

The severity of ODBII code B1770 is moderate.

Common Causes For: B1769 Seat Driver Backward Circuit Failure

• Faulty seat position sensor
• Damaged wiring or connectors
• Open circuit in the seat adjustment system
• Malfunctioning seat control module
• Poor ground connection
• Corroded or loose electrical connections

Common misdiagnosis for B1770 Seat Driver Backward Circuit Open

• Faulty seat position sensor
• Malfunctioning seat control module
• Wiring issues or shorts in the seat harness
• Defective power seat motor
• Issues with the body control module (BCM)
• Problems with the vehicle’s electrical system
• Faulty connectors or terminals related to the seat system

Common Troubleshooting Steps

The OBD-II code B1770 indicates a problem with the driver’s seat backward circuit, specifically that there is an open circuit. This can affect the operation of the seat’s adjustment mechanism. Here are some common troubleshooting steps to diagnose and potentially resolve the issue:

• Check the Vehicle’s Manual: Refer to the vehicle’s service manual for specific information related to the B1770 code, including wiring diagrams and component locations.
• Visual Inspection:
• Inspect the wiring and connectors associated with the driver’s seat adjustment mechanism. Look for any signs of damage, fraying, or corrosion.
• Ensure that all connectors are securely plugged in and that there are no bent pins.
• Test the Seat Motor:
• If accessible, test the seat motor for continuity. You can use a multimeter to check if the motor is functioning properly.
• If the motor is faulty, it may need to be replaced.
• Check for Power and Ground:
• Use a multimeter to check for voltage at the seat motor connector when the seat adjustment switch is activated. Ensure that the correct voltage is present.
• Check for a good ground connection at the seat motor. A poor ground can cause the circuit to be open.
• Inspect the Seat Adjustment Switch:
• Test the seat adjustment switch for proper operation. If the switch is faulty, it may not send the correct signals to the motor.
• If necessary, replace the switch.
• Look for Faulty Wiring:
• Trace the wiring from the seat motor back to the main harness. Look for any breaks, shorts, or damaged insulation that could cause an open circuit.
• Repair or replace any damaged wiring as needed.
• Check for Faulty Modules:
• In some vehicles, the seat adjustment may be controlled by a body control module (BCM) or another control module. If other components are also malfunctioning, the module may need to be tested or replaced.
• Clear the Code and Test Drive:
• After performing repairs, clear the code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns.
• Consult a Professional:
• If the issue persists after performing 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 B1770 code. Always ensure safety precautions are taken when working with electrical components in a vehicle.