B1484 – Brake Pedal Input Open Circuit

The ODBII code B1484 indicates that there is an open circuit in the brake pedal input signal, meaning the vehicle’s system is not receiving a proper signal from the brake pedal switch.

The severity of ODBII code B1484 Brake Pedal Input Open Circuit is moderate to high.

Common Causes For: B1483 Brake Pedal Input Circuit Failure

• Faulty brake pedal position sensor
• Damaged wiring or connectors
• Poor electrical connections
• Malfunctioning brake control module
• Blown fuse related to the brake system
• Corrosion or dirt in the connector terminals
• Faulty brake switch

Common misdiagnosis for B1484 Brake Pedal Input Open Circuit

• Faulty brake pedal switch
• Wiring issues or shorts in the brake pedal circuit
• Malfunctioning brake control module
• Issues with the vehicle’s body control module (BCM)
• Problems with the ABS module
• Incorrectly installed or damaged brake pedal assembly
• Faulty connectors or terminals in the brake system wiring
• Software or calibration issues in the vehicle’s control systems

Common Troubleshooting Steps

The OBD-II code B1484 indicates a “Brake Pedal Input Open Circuit.” This code typically relates to the brake pedal position sensor or the circuit associated with it. Here are some common troubleshooting steps to diagnose and resolve this issue:

• Check the Vehicle’s Manual: Refer to the vehicle’s service manual for specific information regarding the brake pedal position sensor and its circuit.
• Visual Inspection:
• Inspect the wiring and connectors associated with the brake pedal position sensor for any signs of damage, corrosion, or loose connections.
• Look for frayed wires, broken connectors, or any other physical damage.
• Test the Brake Pedal Position Sensor:
• Use a multimeter to check the resistance and voltage output of the brake pedal position sensor. Compare the readings to the specifications in the service manual.
• If the sensor is out of specification, it may need to be replaced.
• Check for Open Circuits:
• Use a multimeter to check for continuity in the wiring harness leading to the brake pedal position sensor. Look for any breaks or open circuits.
• If you find an open circuit, repair or replace the damaged wiring.
• Inspect the Brake Pedal Assembly:
• Ensure that the brake pedal is not physically obstructed and that it moves freely.
• Check that the brake pedal position sensor is properly mounted and aligned.
• Scan for Additional Codes:
• Use an OBD-II scanner to check for any other related trouble codes that may provide additional context for the issue.
• Clear the Codes:
• After performing any repairs, clear the trouble codes using an OBD-II scanner and take the vehicle for a test drive to see if the code returns.
• Check the Vehicle’s Ground:
• Ensure that the ground connections for the brake pedal position sensor and related components are secure and free of corrosion.
• Consult Technical Service Bulletins (TSBs):
• Check for any TSBs related to the brake pedal position sensor for your specific vehicle make and model, as there may be known issues or recalls.
• Professional Diagnosis:
• If the issue persists after performing the above steps, consider seeking help from 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 B1484 code.