The OBD2 code B1155 in a 2002 Ford Taurus indicates a Battery Disconnect Circuit Failure. This means there’s a problem with the circuit that controls the disconnection of the battery from the vehicle’s electrical system. Understanding this code and its potential causes can help you diagnose and fix the issue.
What Does OBD2 Code B1155 Mean?
Specifically, the B1155 code points to a malfunction in the battery disconnect relay or its associated circuitry. This relay is responsible for disconnecting the battery in certain situations, such as a crash, to prevent fires or further electrical damage. When the Battery Disconnect Circuit fails, the relay may not function correctly, leaving the battery connected when it should be disconnected.
Common Causes of B1155 in a 2002 Ford Taurus
Several factors can contribute to a B1155 code in a 2002 Ford Taurus:
- Faulty Battery Disconnect Relay: The relay itself might be defective due to internal damage or wear and tear.
- Wiring Issues: Damaged, corroded, or loose wiring in the battery disconnect circuit can disrupt the signal and cause the code. This includes the wiring to the relay, the battery, and the associated control modules.
- Blown Fuse: A blown fuse in the battery disconnect circuit can interrupt power to the relay, preventing it from functioning.
- Control Module Malfunction: In some cases, a malfunctioning control module, such as the Body Control Module (BCM) or Powertrain Control Module (PCM), can trigger the B1155 code if it’s unable to properly control the battery disconnect relay.
Diagnosing and Fixing the B1155 Code
To effectively address the B1155 code, follow these diagnostic steps:
- Verify the Code: Use an OBD2 scanner to confirm the presence of the B1155 code. Clear the code and see if it returns.
- Inspect the Battery Disconnect Relay: Locate the relay (usually in the fuse box or under the hood) and visually inspect it for damage or corrosion. Test the relay using a multimeter to ensure it’s functioning correctly.
- Check Wiring and Connections: Thoroughly examine the wiring harness connected to the relay and battery for any signs of damage, fraying, or loose connections. Repair or replace any faulty wiring.
- Inspect Fuses: Check the relevant fuse(s) in the fuse box for the battery disconnect circuit. Replace any blown fuses.
- Test Control Modules: If the relay, wiring, and fuses are all good, you may need to test the relevant control modules using a diagnostic scan tool to identify any communication errors or malfunctions. This may require specialized equipment and knowledge.
Conclusion
The OBD2 code B1155 in a 2002 Ford Taurus indicates a potential safety concern and should be addressed promptly. By understanding the function of the battery disconnect circuit and following a systematic diagnostic approach, you can pinpoint the cause of the problem and implement the necessary repairs. If you are not comfortable working with electrical systems, it’s recommended to consult a qualified mechanic for diagnosis and repair. Ignoring this code could lead to further electrical problems or even a dangerous situation in the event of an accident.
