B1726 – Seat Driver Rear Up Switch Circuit Open

The ODBII code B1726 indicates a malfunction in the driver rear seat up switch circuit, specifically that the circuit is open, meaning there is a break or disconnection preventing proper function.

The severity of ODBII code B1726 is moderate.

Common Causes For: B1725 Seat Driver Rear Up Switch Circuit Failure

• Faulty seat switch
• Damaged wiring or connectors
• Open circuit in the wiring harness
• Faulty seat control module
• Poor ground connection

Common misdiagnosis for B1726 Seat Driver Rear Up Switch Circuit Open

• Faulty seat switch
• Wiring issues
• Faulty seat module
• Malfunctioning body control module (BCM)
• Incorrectly diagnosed power supply issues
• Misidentified ground connection problems
• Faulty connectors or terminals
• Software or calibration errors in the vehicle’s system

Common Troubleshooting Steps

The OBD-II code B1726 refers to a problem with the “Seat Driver Rear Up Switch Circuit,” indicating that there is an open circuit in the switch that controls the rear up function of the driver’s seat. Here are some common troubleshooting steps to diagnose and potentially resolve this issue:

• Check the OBD-II Code:: Use an OBD-II scanner to confirm the presence of the B1726 code. Take note of any other related codes that may provide additional context.
• Inspect the Wiring and Connectors:: **Visual Inspection:** Check the wiring harness and connectors associated with the driver’s seat adjustment switch. Look for any signs of damage, such as frayed wires, corrosion, or loose connections.
• **Connector Condition:** Ensure that the connectors are securely attached and free of dirt or moisture.
• Test the Switch:: **Functionality Check:** If possible, test the seat adjustment switch itself to ensure it is functioning correctly. You can do this by using a multimeter to check for continuity when the switch is activated.
• **Replace if Necessary:** If the switch is found to be faulty, replace it with a new one.
• Check for Ground Issues:: Ensure that the ground connection for the seat adjustment circuit is intact. A poor ground can lead to an open circuit condition.
• Inspect the Seat Control Module:: If the vehicle is equipped with a seat control module, check for any faults or issues with the module itself. This may involve checking for software updates or performing a reset.
• Look for Short Circuits:: Inspect the circuit for any potential short circuits that could be affecting the operation of the switch. This may involve checking for pinched wires or damaged insulation.
• Check Fuses:: Inspect the fuses related to the seat adjustment system. A blown fuse could cause the circuit to open.
• Perform a System Reset:: After addressing any issues found, clear the OBD-II codes using the scanner and perform a test drive to see if the code returns.
• Consult the Service 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 the issue persists after performing the above steps, it may be necessary 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 resolve the issue related to the B1726 code.