B1519 – Hood Switch Circuit Failure

The ODBII code B1519 indicates a malfunction in the hood switch circuit, which may involve issues with the switch itself, wiring, or the connection to the vehicle’s control module.

The severity of ODBII code B1519 Hood Switch Circuit Failure is generally considered low to moderate.

Common Causes For: B1518 Seat Driver Occupied Switch Circuit Short To Ground

• Faulty hood switch
• Damaged wiring or connectors
• Corrosion at the hood switch or connectors
• Short circuit in the hood switch circuit
• Open circuit in the hood switch circuit
• Malfunctioning body control module (BCM)
• Poor ground connection

Common misdiagnosis for B1519 Hood Switch Circuit Failure

• Faulty hood latch
• Wiring issues or shorts in the circuit
• Malfunctioning body control module (BCM)
• Defective hood switch
• Issues with the vehicle’s alarm system
• Problems with the power distribution module (PDM)
• Incorrectly diagnosed as a battery or charging system issue

Common Troubleshooting Steps

The OBD-II code B1519 indicates a “Hood Switch Circuit Failure.” This code typically relates to the vehicle’s security system or the hood latch switch, which is responsible for detecting whether the hood is open or closed. Here are some common troubleshooting steps to diagnose and resolve this issue:

• Visual Inspection:
• Check the hood latch and switch for any visible damage or corrosion.
• Inspect the wiring and connectors leading to the hood switch for fraying, breaks, or loose connections.
• Test the Hood Switch:
• Use a multimeter to test the hood switch for continuity. With the hood closed, the switch should show continuity (closed circuit), and with the hood open, it should show no continuity (open circuit).
• If the switch is faulty, replace it.
• Check the Wiring:
• Follow the wiring from the hood switch to the vehicle’s main harness. Look for any signs of wear, damage, or disconnection.
• Repair or replace any damaged wiring or connectors.
• Inspect the Body Control Module (BCM):
• The BCM may be responsible for interpreting the signal from the hood switch. Check for any fault codes related to the BCM.
• If necessary, reprogram or replace the BCM, but this should be a last resort after confirming other components are functioning correctly.
• Clear the Codes:
• After performing repairs, clear the OBD-II codes using a scan tool and take the vehicle for a test drive to see if the code returns.
• Check for Related Codes:
• Look for any other related trouble codes that may provide additional context or indicate a broader issue with the vehicle’s electrical system.
• Consult the Vehicle’s Service Manual:
• Refer to the specific service manual for your vehicle make and model for detailed wiring diagrams and troubleshooting procedures.
• Seek Professional Help:
• If the issue persists after performing these steps, consider consulting a professional mechanic or technician who has experience with your vehicle’s make and model. By following these steps, you should be able to identify and resolve the issue related to the B1519 code.