B1657 – Seat Driver Rear Up Circuit Short To Battery

The ODBII code B1657 indicates a short circuit in the driver rear seat’s up adjustment circuit, causing it to connect directly to the battery, which can lead to malfunctioning of the seat adjustment system.

The severity of ODBII code B1657 is moderate.

Common Causes For: B1656 Seat Driver Rear Up Circuit Open

• Shorted wiring or connectors
• Faulty seat motor
• Damaged seat control module
• Corroded or loose electrical connections
• Malfunctioning switch or control panel
• Grounding issues
• Aftermarket modifications or installations

Common misdiagnosis for B1657 Seat Driver Rear Up Circuit Short To Battery

• Faulty seat switch
• Wiring harness issues
• Defective seat motor
• Malfunctioning body control module (BCM)
• Shorted wiring in the seat assembly
• Incorrectly installed or damaged connectors
• Issues with the power supply circuit

Common Troubleshooting Steps

When dealing with an OBD-II code B1657, which indicates a “Seat Driver Rear Up 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 B1657 code.
• Check for any additional codes that may provide more context.
• Inspect the Wiring and Connectors: **Visual Inspection: Check the wiring harness and connectors related to the seat adjustment mechanism for any signs of 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 adjustment circuit. Look for any shorts to ground or battery voltage.
• **Resistance Check: Measure the resistance in the circuit to identify any abnormal readings that could indicate a short.
• Inspect the Seat Adjustment Motor: **Motor Functionality: Test the seat adjustment motor to ensure it is functioning properly. If the motor is shorted internally, it may cause the code to trigger.
• **Power Supply: Verify that the motor is receiving the correct voltage when the seat adjustment switch is activated.
• Check the Seat Adjustment Switch: **Switch Operation: Test the seat adjustment switch for proper operation. A faulty switch can cause incorrect signals to be sent to the control module.
• **Wiring to Switch: Inspect the wiring leading to the switch for any damage or shorts.
• Inspect the Body Control Module (BCM): **BCM Functionality: If all other components check out, the issue may lie within the BCM. Ensure that it is functioning correctly and is not sending erroneous signals.
• **Software Updates: Check if there are any software updates or recalls related to the BCM that may address the issue.
• 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 B1657 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 and OBD-II diagnostics. By following these steps, you should be able to identify and resolve the issue related to the B1657 code. Always ensure safety precautions are taken when working with electrical systems in vehicles.