B1771 – Seat Driver Backward Circuit Short To Battery

The ODBII code B1771 indicates a short circuit in the driver seat’s backward movement circuit, causing it to connect directly to the battery, which can lead to malfunctioning of the seat adjustment system.

The severity of ODBII code B1771 is moderate.

Common Causes For: B1770 Seat Driver Backward Circuit Open

• Shorted wiring or connectors in the seat circuit.
• Faulty seat position sensor.
• Malfunctioning seat control module.
• Damaged or frayed wiring harness.
• Corroded connectors or terminals.
• Improper installation of aftermarket seat components.
• Faulty power supply to the seat system.

Common misdiagnosis for B1771 Seat Driver Backward Circuit Short To Battery

• Faulty seat position sensor
• Wiring issues or shorts in the seat harness
• Malfunctioning seat control module
• Issues with the body control module (BCM)
• Problems with the power seat switch
• Battery or charging system problems
• Grounding issues in the seat circuit

Common Troubleshooting Steps

When dealing with an OBD-II code B1771, which indicates a “Seat Driver Backward Circuit Short To Battery,” it’s important to follow a systematic approach to troubleshoot the issue. Here are common troubleshooting steps you can take:

• Verify the Code: Use an OBD-II scanner to confirm the presence of the B1771 code.
• Check for any additional codes that may provide more context or related issues.
• Inspect the Wiring and Connectors: **Visual Inspection: Check the wiring harness and connectors associated with the driver’s seat for any visible damage, fraying, or corrosion.
• **Connector Condition: Ensure that all connectors are securely attached and free of dirt or moisture.
• Check for Short Circuits: **Multimeter Testing: Use a multimeter to check for continuity in the seat motor circuit. Look for any shorts to ground or battery voltage.
• **Resistance Check: Measure the resistance of the seat motor circuit. A very low resistance could indicate a short.
• Inspect the Seat Motor: **Functionality Test: If possible, test the seat motor by applying direct power to see if it operates correctly.
• **Motor Condition: Check for any signs of damage or wear on the motor itself.
• Examine the Seat Control Module: **Module Inspection: If applicable, inspect the seat control module for any signs of damage or malfunction.
• **Reprogramming: In some cases, reprogramming or resetting the module may be necessary.
• Check for Ground Issues: Ensure that the ground connections for the seat motor and control module are secure and free of corrosion.
• Look for Related Issues: Investigate if there are any other components in the seat system (like switches or other motors) that may be causing the issue.
• Check for any aftermarket modifications that may have been made to the seat wiring.
• Clear the Code and Test Drive: After performing the above checks and repairs, clear the code using the OBD-II scanner.
• Take the vehicle for a test drive to see if the code returns.
• Consult Service Manual: If the issue persists, refer to the vehicle’s service manual for specific diagnostic procedures related to the B1771 code.
• Seek Professional Help: If you are unable to resolve the issue, consider seeking assistance from a qualified mechanic or automotive technician who has experience with electrical systems. By following these steps, you should be able to identify and resolve the issue related to the B1771 code. Always ensure safety precautions are taken when working with electrical systems in vehicles.