B1981 – Memory Off Switch Circuit Short to Battery

The ODBII code B1981 indicates a malfunction in the memory off switch circuit, specifically a short to battery, which means the circuit is receiving constant power when it shouldn’t, potentially affecting the vehicle’s memory functions.

The severity of ODBII code B1981 is moderate.

Common Causes For: B1980 Bulb – Outage Condition Detected

• Shorted wiring or connectors in the memory off switch circuit.
• Faulty memory off switch.
• Damaged or corroded connectors.
• Grounding issues in the circuit.
• Malfunctioning body control module (BCM).
• Incorrectly installed aftermarket accessories.

Common misdiagnosis for B1981 Memory Off Switch Circuit Short to Battery

• Faulty memory off switch
• Wiring issues or shorts in the harness
• Defective body control module (BCM)
• Malfunctioning ignition switch
• Battery or charging system problems
• Incorrectly installed aftermarket accessories
• Faulty connectors or terminals

Common Troubleshooting Steps

The OBD-II code B1981 indicates a problem with the Memory Off Switch Circuit, specifically a short to battery. This code is often related to the vehicle’s memory functions, such as those found in the radio, seats, or other electronic components that retain settings when the vehicle is turned off. Here are some common troubleshooting steps to diagnose and resolve this issue:

• Check the Vehicle’s Wiring and Connectors: Inspect the wiring harness and connectors associated with the Memory Off Switch Circuit. Look for any signs of damage, fraying, or corrosion.
• Ensure that all connectors are securely attached and free of dirt or moisture.
• Inspect the Memory Off Switch: If applicable, check the Memory Off Switch itself for proper operation. Ensure that it is not stuck or damaged.
• Test the switch with a multimeter to confirm it is functioning correctly.
• Check for Short Circuits: Use a multimeter to check for continuity in the circuit. Look for any unintended connections to the battery or ground that could indicate a short circuit.
• Disconnect the battery and check the resistance of the circuit to ground. A low resistance reading may indicate a short.
• Examine Related Components: Investigate any components that may be connected to the Memory Off Switch Circuit, such as the body control module (BCM) or other electronic modules.
• Check for any fault codes related to these components that may provide additional insight.
• Inspect Fuses and Relays: Check the fuses and relays associated with the Memory Off Switch Circuit. A blown fuse may indicate an overload or short circuit.
• Replace any blown fuses and test the circuit again.
• Scan for Additional Codes: Use an OBD-II scanner to check for any additional trouble codes that may be present. This can help identify if there are other related issues that need to be addressed.
• Clear the Codes and Test Drive: After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner.
• Take the vehicle for a test drive to see if the code reappears. Monitor the system to ensure that the Memory Off Switch Circuit is functioning correctly.
• Consult the Service Manual: If the issue persists, refer to the vehicle’s service manual for specific diagnostic procedures and wiring diagrams related to the Memory Off Switch Circuit.
• Seek Professional Help: If you are unable to resolve the issue after following these steps, consider seeking assistance from a qualified mechanic or automotive technician who has experience with electrical systems. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the OBD-II code B1981.