B1658 – Seat Driver Rear Up Circuit Short To Ground

The ODBII code B1658 indicates a short circuit to ground in the driver rear seat’s up adjustment circuit, which may prevent the seat from moving up properly.

The severity of ODBII code B1658 is generally considered moderate.

Common Causes For: B1657 Seat Driver Rear Up Circuit Short To Battery

• Damaged wiring or connectors
• Shorted seat motor
• Faulty seat control module
• Corroded terminals
• Grounding issues
• Malfunctioning switch
• Improper installation or modifications

Common misdiagnosis for B1658 Seat Driver Rear Up Circuit Short To Ground

• Faulty seat motor
• Damaged wiring harness
• Defective seat switch
• Malfunctioning body control module (BCM)
• Poor ground connection
• Shorted or damaged connectors
• Incorrectly installed seat components

Common Troubleshooting Steps

When dealing with an OBD-II code B1658, which indicates a “Seat Driver Rear Up Circuit Short to Ground,” 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 B1658 code. Clear the code and see if it returns after a short drive.
• Inspect the Wiring and Connectors: **Visual Inspection: Check the wiring harness and connectors related to the seat adjustment mechanism for any visible damage, fraying, or corrosion.
• **Connector Check: Ensure that all connectors are securely attached and free of dirt or moisture.
• Check for Shorts to Ground: **Multimeter Testing: Use a multimeter to check for continuity between the seat adjustment circuit and ground. If you find continuity where there shouldn’t be, you likely have a short to ground.
• **Wiring Harness Inspection: Trace the wiring from the seat adjustment motor back to the control module, looking for any points where the wire may be pinched or damaged.
• Test the Seat Adjustment Motor: **Motor Functionality: If accessible, test the seat adjustment motor directly by applying power to it to see if it operates correctly.
• **Resistance Check: Measure the resistance of the motor windings to ensure they are within specifications.
• Check the Control Module: **Module Functionality: If the wiring and motor are in good condition, the issue may lie with the seat control module. Check for any fault codes in the module and ensure it is functioning properly.
• **Software Updates: Check if there are any software updates available for the control module that may address known issues.
• Inspect Related Components: **Switches and Relays: Check the seat adjustment switch and any associated relays for proper operation. A faulty switch can sometimes cause a short circuit.
• **Ground Connections: Ensure that all ground connections related to the seat adjustment system are clean and secure.
• Consult Wiring Diagrams: Use the vehicle’s service manual to refer to wiring diagrams for the seat adjustment circuit. This can help you identify the correct pinouts and connections.
• Perform a System Reset: After repairs, clear the code and perform a system reset to see if the issue persists.
• Seek Professional Help: If you are unable to resolve the issue after these steps, consider consulting a professional mechanic or an automotive electrician for further diagnosis.Safety Precautions – Always disconnect the battery before working on electrical components to prevent accidental shorts or shocks. – Be cautious when working with airbags or other safety systems. By following these steps, you should be able to identify and resolve the issue related to the B1658 code.