B1975 – Passenger’s Seat Recline Back Switch Circuit Short to Battery

The ODBII code B1975 indicates a malfunction in the passenger’s seat recline back switch circuit, specifically that there is a short circuit to the battery, which means the circuit is receiving power continuously instead of functioning normally.

The severity of ODBII code B1975 is moderate.

Common Causes For: B1975 Passenger’s Seat Recline Back Switch Circuit Short to Battery

• Shorted wiring or connectors
• Faulty seat recline switch
• Damaged seat control module
• Corroded or loose electrical connections
• Malfunctioning power seat motor
• Grounding issues in the circuit

Common misdiagnosis for B1975 Passenger’s Seat Recline Back Switch Circuit Short to Battery

• Faulty seat recline motor
• Damaged wiring harness
• Defective seat control module
• Malfunctioning body control module (BCM)
• Shorted or corroded connectors
• Issues with the power supply or ground connections
• Faulty seat position sensor
• Incorrectly installed aftermarket seat components

Common Troubleshooting Steps

When dealing with an OBD-II code B1975, which indicates a “Passenger’s Seat Recline Back Switch Circuit Short to Battery,” there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. Here’s a structured approach:

• Check the Code and Freeze Frame Data: Use an OBD-II scanner to confirm the B1975 code is present.
• Review any freeze frame data to understand the conditions under which the code was set.
• Visual Inspection: Inspect the passenger seat recline switch for any visible damage, corrosion, or loose connections.
• Check the wiring harness and connectors leading to the switch for signs of wear, fraying, or short circuits.
• Look for any signs of water intrusion or foreign objects that may be causing a short.
• Test the Switch: Disconnect the passenger seat recline switch and test it with a multimeter.
• Check for continuity in the switch when it is activated. If the switch is faulty, it may need to be replaced.
• Inspect the Wiring: Trace the wiring from the switch to the seat control module and check for shorts to ground or battery.
• Use a multimeter to check for continuity and resistance in the wiring. Look for any breaks or shorts in the circuit.
• Check the Seat Control Module: If the wiring and switch are in good condition, the issue may lie within the seat control module.
• Inspect the module for any signs of damage or corrosion.
• If possible, test the module with a known good unit or use a scan tool to check for additional codes that may indicate module failure.
• Inspect Ground Connections: Ensure that all ground connections related to the seat and its components are clean and secure.
• A poor ground can cause erratic behavior and may lead to false codes.
• 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, consult the vehicle’s service manual for specific wiring diagrams and troubleshooting procedures related to the passenger seat recline 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 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 during the troubleshooting process for future reference. By following these steps, you should be able to identify and resolve the issue related to the B1975 code.