B1575 – Lamp Park Input Circuit Failure

The ODBII code B1575 indicates a malfunction in the Lamp Park Input Circuit, which is related to the operation of the vehicle’s lighting system, often affecting the parking lights or related components.

The severity of ODBII code B1575 Lamp Park Input Circuit Failure is generally considered moderate.

Common Causes For: B1574 Door Ajar LR Circuit Short To Ground

• Faulty lamp park switch
• Damaged wiring or connectors
• Short circuit in the circuit
• Open circuit in the circuit
• Faulty body control module (BCM)
• Corroded terminals
• Poor ground connection

Common misdiagnosis for B1575 Lamp Park Input Circuit Failure

• Faulty body control module (BCM)
• Wiring issues or shorts in the circuit
• Defective park lamp switch
• Malfunctioning headlight switch
• Incorrectly installed or faulty bulbs
• Grounding issues
• Software or programming errors in the BCM
• Other unrelated electrical faults in the vehicle’s lighting system

Common Troubleshooting Steps

The OBD-II code B1575 refers to a “Lamp Park Input Circuit Failure,” which typically indicates an issue with the park lamp circuit in the vehicle. This code can be associated with various problems, including wiring issues, faulty components, or problems with the vehicle’s body control module (BCM). Here are some common troubleshooting steps to diagnose and resolve the issue:

• Check for Additional Codes: Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide additional context for the problem.
• Inspect the Wiring and Connectors: Visually inspect the wiring and connectors associated with the park lamp circuit. Look for signs of damage, corrosion, or loose connections.
• Pay special attention to any connectors that may be exposed to moisture or dirt.
• Test the Park Lamp Bulbs: Check the park lamp bulbs to ensure they are functioning correctly. Replace any burnt-out bulbs.
• Ensure that the bulbs are properly seated in their sockets.
• Check the Park Lamp Relay: If the vehicle is equipped with a relay for the park lamps, test the relay to ensure it is functioning properly. You can swap it with a similar relay in the fuse box to see if the issue resolves.
• Inspect the Body Control Module (BCM): The BCM controls various electrical functions in the vehicle, including the park lamps. Check for any signs of damage or malfunction.
• If necessary, perform a reset or reprogramming of the BCM according to the manufacturer’s specifications.
• Test the Park Lamp Circuit: Use a multimeter to test the voltage and ground at the park lamp circuit. Ensure that the circuit is receiving the correct voltage when the park lamps are activated.
• Check for continuity in the wiring from the BCM to the park lamps.
• Check for Short Circuits or Open Circuits: Inspect the circuit for any short circuits or open circuits that could be causing the failure. This may involve tracing the wiring and using a multimeter to check for continuity.
• Consult Wiring Diagrams: Refer to the vehicle’s wiring diagrams to understand the park lamp circuit’s layout and identify any potential problem areas.
• Clear the Code and Test Drive: After performing any repairs or adjustments, clear the trouble code using the OBD-II scanner and take the vehicle for a test drive to see if the code reappears.
• Seek Professional Help: If the issue persists after performing these troubleshooting steps, it may be necessary to consult a professional mechanic or technician who has experience with the specific make and model of your vehicle. By following these steps, you should be able to identify and resolve the issue related to the B1575 code. Always refer to the vehicle’s service manual for specific procedures and specifications.