B1568 – Lamp Headlamp High-Beam Circuit Open

The ODBII code B1568 indicates that there is an open circuit in the high-beam headlamp circuit, meaning the system is not detecting the high-beam function as expected.

The severity of ODBII code B1568 is moderate.

Common Causes For: B1567 Lamp Headlamp High-Beam Circuit Failure

• Open circuit in the high-beam wiring
• Faulty high-beam headlamp bulb
• Defective headlamp relay
• Bad connection or corroded terminals
• Malfunctioning body control module (BCM)
• Damaged or frayed wiring harness
• Faulty switch or control stalk for high beams

Common misdiagnosis for B1568 Lamp Headlamp High-Beam Circuit Open

• Faulty headlight switch
• Bad high-beam relay
• Wiring issues or shorts
• Defective body control module (BCM)
• Malfunctioning fuse
• Incorrect bulb installation or failure
• Ground connection problems

Common Troubleshooting Steps

The OBD-II code B1568 indicates a problem with the high-beam circuit of the headlamp, specifically that there is an open circuit. Here are some common troubleshooting steps to diagnose and resolve this issue:

• Check the Headlight Bulb:
• Inspect the high-beam headlight bulb for any signs of damage or burnout. Replace the bulb if necessary.
• Inspect the Wiring and Connectors:
• Examine the wiring harness and connectors leading to the high-beam bulb for any signs of damage, corrosion, or loose connections. Repair or replace any damaged components.
• Test the High-Beam Switch:
• Check the high-beam switch on the steering column or dashboard. Ensure it is functioning correctly and making proper contact. If the switch is faulty, it may need to be replaced.
• Check the Fuses:
• Locate the fuse box and check the fuse associated with the high-beam circuit. Replace any blown fuses.
• Test the Relay:
• If your vehicle uses a relay for the high-beam circuit, test the relay to ensure it is functioning properly. Swap it with a similar relay (if available) to see if the problem persists.
• Use a Multimeter:
• Use a multimeter to check for continuity in the wiring from the high-beam switch to the headlight bulb. Look for any breaks in the circuit.
• Inspect Ground Connections:
• Ensure that the ground connections for the headlight circuit are clean and secure. A poor ground can cause circuit issues.
• Check for Short Circuits:
• Look for any signs of short circuits in the wiring that could be causing the open circuit condition.
• Scan for Additional Codes:
• Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues.
• Consult Wiring Diagrams:
• Refer to the vehicle’s wiring diagrams to understand the circuit layout and identify any other components that may be involved. 1
• Professional Diagnosis:
• If the issue persists after performing these steps, consider seeking help from a professional mechanic or automotive technician who can perform more advanced diagnostics. By following these steps, you should be able to identify and resolve the issue related to the B1568 code.