B1728 – Seat Driver Rear Up Switch Circuit Short To Ground

The ODBII code B1728 indicates a malfunction in the driver rear seat’s up switch circuit, specifically that there is a short to ground, which means the circuit is unintentionally connected to the ground, causing it to malfunction.

The severity of ODBII code B1728 is generally considered moderate.

Common Causes For: B1727 Seat Driver Rear Up Switch Circuit Short To Battery

• Damaged wiring or connectors
• Faulty seat switch
• Short circuit in the wiring harness
• Corroded connectors
• Malfunctioning seat control module
• Improper installation or modifications
• Water intrusion or moisture damage

Common misdiagnosis for B1728 Seat Driver Rear Up Switch Circuit Short To Ground

• Faulty seat switch
• Wiring issues or shorts in the harness
• Malfunctioning seat control module
• Issues with the body control module (BCM)
• Faulty connectors or terminals
• Problems with the power supply to the seat system
• Incorrectly diagnosed seat motor failure

Common Troubleshooting Steps

When dealing with an OBD-II code B1728, which indicates a “Seat Driver Rear Up Switch Circuit Short To Ground,” there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. Here’s a structured approach:

• Understand the Code: B1728 typically refers to a problem with the seat adjustment switch circuit, specifically the “up” function for the driver’s rear seat. A short to ground means that the circuit is being unintentionally connected to ground, which can cause the switch to malfunction.
• Visual Inspection: **Wiring and Connectors: Inspect the wiring harness and connectors associated with the seat adjustment switch. Look for frayed wires, corrosion, or loose connections.
• **Switch Condition: Check the seat switch for any visible damage or wear.
• Check for Other Codes: Use an OBD-II scanner to check if there are any other related trouble codes. This can provide additional context for the issue.
• Test the Switch: **Continuity Test: Disconnect the switch and use a multimeter to check for continuity in the switch. It should show continuity when pressed and none when released.
• **Resistance Check: Measure the resistance of the switch. If it shows a short (very low resistance) when it should not, the switch may be faulty.
• Inspect the Circuit: **Wiring Diagram: Refer to the vehicle’s wiring diagram to understand the circuit layout. This will help you identify where the short might be occurring.
• **Check for Shorts: Use a multimeter to check for shorts to ground in the wiring harness. Disconnect the battery and test the wires for continuity to ground.
• Check Ground Connections: Ensure that all ground connections related to the seat adjustment system are clean and secure. A poor ground can sometimes cause erratic behavior.
• Test the Seat Module (if applicable): If the vehicle has a seat control module, it may need to be tested or reset. Check for any software updates or recalls related to the seat control system.
• Repair or Replace Components: Based on your findings, repair any damaged wiring or connectors. If the switch is faulty, replace it. If the seat control module is defective, consider replacing it as well.
• Clear the Code and Test Drive: After making repairs, clear the trouble codes using the OBD-II scanner. Take the vehicle for a test drive to see if the code returns.
• Consult a Professional: If the issue persists after following these steps, it may be best to consult a professional mechanic or an automotive electrician for further diagnosis.Additional Tips: – Always disconnect the battery before working on electrical components to avoid shorts or shocks. – Document any changes or repairs made for future reference. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1728 code.