B1656 – Seat Driver Rear Up Circuit Open

The ODBII code B1656 indicates that there is an open circuit in the driver rear seat’s up adjustment mechanism, meaning the system is unable to detect the position or operation of the seat’s upward movement.

The severity of ODBII code B1656 is generally considered moderate.

Common Causes For: B1655 Seat Driver Rear Up Circuit Failure

• Open circuit in the wiring
• Faulty seat position sensor
• Damaged connector or terminals
• Faulty power seat switch
• Malfunctioning body control module (BCM)
• Ground connection issues

Common misdiagnosis for B1656 Seat Driver Rear Up Circuit Open

• Faulty seat switch
• Wiring issues or shorts
• Defective seat motor
• Malfunctioning body control module (BCM)
• Poor ground connection
• Incorrectly installed or damaged seat harness
• Faulty power supply to the seat circuit

Common Troubleshooting Steps

The OBD-II code B1656 indicates a problem with the “Seat Driver Rear Up Circuit,” specifically that there is an open circuit. This code is often related to the power seat system in vehicles. Here are some common troubleshooting steps to diagnose and potentially resolve the issue:

• Visual Inspection: **Wiring and Connectors: Check the wiring harness and connectors associated with the seat adjustment mechanism. Look for any signs of damage, fraying, or corrosion.
• **Seat Mechanism: Inspect the seat itself for any obstructions or mechanical issues that could prevent movement.
• Check Fuses: Locate the fuse box and check for any blown fuses related to the power seat system. Replace any blown fuses and see if the issue persists.
• Test the Seat Switch: Use a multimeter to test the seat switch for continuity. If the switch is faulty, it may need to be replaced.
• Inspect the Motor: If the switch is functioning correctly, check the seat motor. You can do this by applying direct power to the motor to see if it operates. If it does not, the motor may be faulty and require replacement.
• Check for Ground Issues: Ensure that the ground connections for the seat motor and switch are secure and free of corrosion. A poor ground can lead to an open circuit.
• Scan for Additional Codes: Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues.
• Inspect the Body Control Module (BCM): If all other components check out, the issue may lie within the BCM. Check for any software updates or faults in the module.
• Perform a Reset: After addressing any issues, clear the trouble codes using an OBD-II scanner and see if the code returns after a test drive.
• Consult Repair Manual: Refer to the vehicle’s service manual for specific wiring diagrams and troubleshooting procedures related to the seat adjustment system.
• Seek Professional Help: If you are unable to resolve the issue after 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 potentially resolve the issue related to the B1656 code.