OBD-II DTC B1520 – Hood Switch Circuit Open
DTC B1520 meaning
DTC B1520 refers to a diagnostic trouble code indicating an issue with the hood switch circuit. Specifically, it signifies that the circuit is open, meaning there is a break in the electrical connection that prevents the hood switch from functioning properly. The hood switch is crucial for various vehicle systems, including security and safety features.
DTC B1520 symptoms
Common symptoms associated with DTC B1520 may include:
- Illumination of the check engine light or other warning lights on the dashboard.
- Inability to activate certain features that rely on the hood being closed, such as the alarm system.
- Potential issues with the vehicle’s security system.
DTC B1520 causes
The causes of DTC B1520 can vary, but typical reasons include:
- A faulty hood switch that is not making proper contact.
- Damaged wiring or connectors in the hood switch circuit.
- Corrosion or dirt affecting the electrical connections.
- Issues with the vehicle’s body control module (BCM) that processes the hood switch signal.
DTC B1520 seriousness
DTC B1520 is considered a moderate issue. While it may not immediately affect the drivability of the vehicle, it can compromise safety and security features. Ignoring this code could lead to further electrical issues or problems with the vehicle’s alarm system.
How to diagnose DTC B1520
To diagnose DTC B1520, follow these steps:
- Use an OBD-II scanner to confirm the presence of the B1520 code.
- Inspect the hood switch for physical damage or wear.
- Check the wiring and connectors for signs of damage, corrosion, or loose connections.
- Test the hood switch with a multimeter to ensure it is functioning correctly.
- Examine the body control module for any faults or issues.
How to fix DTC B1520 step-by-step instructions
To fix DTC B1520, follow these steps:
- Start by visually inspecting the hood switch and its wiring.
- If the hood switch is damaged, replace it with a new one.
- Repair or replace any damaged wiring or connectors found during the inspection.
- Clean any corrosion from the electrical connections to ensure proper contact.
- After repairs, reconnect the battery and clear the DTC using an OBD-II scanner.
- Test the vehicle to ensure the issue is resolved and the code does not return.
How to erase DTC B1520
To erase DTC B1520, follow these steps:
- Connect an OBD-II scanner to the vehicle’s diagnostic port.
- Turn on the ignition without starting the engine.
- Navigate to the option to read or clear trouble codes on the scanner.
- Select the option to erase or clear the codes.
- Confirm the action and wait for the scanner to indicate that the codes have been cleared.
- Disconnect the scanner and start the vehicle to ensure the code does not reappear.
Recommended tools for OBD-II diagnostics
Explore our expert picks: The Best OBD2 Scanners for 2025
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.