Hyundai Check High Beam Assist System Common Causes & Troubleshooting

When the “Check High Beam Assist System” warning message appears on your Hyundai’s dashboard, it means there is an issue with the headlights or the High Beam Assist System. Ignoring this warning can lead to faulty headlight operation, reducing visibility while driving in the dark and creating a safety hazard on the road. It is important to diagnose and fix the problem as soon as possible.

What Does the Check High Beam Assist System warning message mean?

The High Beam Assist System is part of your vehicle’s convenience features, which automatically adjusts headlights between the high beam and low beam settings depending on certain road situations. When this light turns on, your High Beam Assist System is malfunctioning.

⚠️ Why You Should Fix It As Soon As Possible:

• Safety Risk: A faulty system can make driving at night more dangerous by requiring the driver to pay more attention and limiting the safety it offers. It can make it harder to spot hazards in time, compromising safety for the driver and others on the road.
•  Performance Issues: If a weak battery is triggering the warning message, your vehicle may have difficulty starting or take longer.
• Costly Repairs if Ignored: Failing to address a faulty sensor connection to the front-view camera can lead to significant repair costs, as the front-view camera will eventually need to be recalibrated. Depending on your region, calibration of the front-view camera will cost around $350 to a hefty $800.

Common Causes of the “Check High Beam Assist System” Warning Message

Here are the most common reasons this light appears:

✅ Weak Battery: Low voltage can cause erroneous system errors and unexpected warning lights. A weak battery can cause several issues with the headlights, such as dimming and flickering, reducing visibility at night.

✅ Blown fuse or faulty relay: A faulty fuse or relay can disrupt Hyundai’s High Beam Assist System. A blown fuse cuts off power, causing the system to stop working entirely, while a blown relay can cause a delay or erratic behavior to the headlights, causing the system to switch beams late or not at all.

✅ Alternator and charging system: The system may not function properly if it is not getting a stable power supply. Headlights need a decent amount of power to provide visibility at night.

✅ Faulty Sensor: The front view camera detects ambient light and brightness that sends a signal to the headlights, making them switch between the high and low beams while driving. Over time, the front-view camera can become dirty, misaligned, or miscalibrated, sending inaccurate signals to the High Beam Assist system. Sometimes, wires and other connections can become loose or faulty, causing the warning message to appear. Other systems that rely on the front-view camera will flash malfunctioning messages, with the high beam assist warning message like the Check Lane Keep Assist and the Check Inattentive Driving Warning System when the front-view camera is at fault.

✅ A modified Windshield: The front-view camera may get obstructed and struggle to detect oncoming traffic and ambient light if the windshield is altered with thorough tinting and installation faults made during windshield replacement.

✅ Defective Headlight Stalk: If the stalk is not working correctly, the system may not detect if the High Beam Assist System is engaged or when to switch between high and low beams. This may cause the system to disable.

✅ Loose or Corroded Wires: Bad connections can cause intermittent faults.

🛠️ Pro Tip: Use an OBD-II scanner to check for error codes related to the issue.

Troubleshooting: Check High Beam Assist System warning message

Before taking your car to a mechanic, try these DIY fixes:

1. Check Battery Health – Use a battery tester, multimeter, or scanner to check for low voltage. Car batteries need to be replaced every 3-5 years. If the voltage falls below 12.4, your battery must be replaced or recharged. If your new battery still struggles to keep a charge after replacing it, you might have a faulty alternator.
2. Replace High Beam Bulb – The headlight bulbs will burn out over time. If your high beams are not turning on, the bulb might be burned out and need to be replaced. This is a relatively cheap and easy procedure to do at home.
3. Inspect Wiring & Connections – Look for loose or frayed wires around the front view camera and headlight assemblies.
4. Inspect Fuses and Relays – Look for damaged or melted fuses in your vehicle’s fuse box. This could be an indicator of an electrical issue in your car. Remove and check the relays of your headlights. Check for signs of damage, such as burn marks, discoloration, or a melted casing. If you have a similar working relay with the exact specifications, swap it with the suspected faulty one. If the system starts functioning correctly, the original relay is the issue.
   ONLY REPLACE OLD FUSES AND RELAYS WITH NEW ONES OF THE SAME AMPERAGE.
5. Inspect sensors – Check the view of your front camera; if it is clear and has no obstructions, look for any signs of cracks and damage on your windshield. This could be the issue if you recently got your windows tinted or your windshield replaced. Heavy tinting and improper windshield installation can cause the front-view camera to malfunction.
6. Reset the System – If a software glitch in the system causes the warning light/error message, it can be cleared by disconnecting the battery for 30 minutes or using a scan tool.
7.  Use an OBD-II Scanner – Read and clear error codes to see if the issue is temporary.

Common OBD-II Fault Codes for Check High Beam Assist System

If you scan your vehicle with an OBD-II scan tool, you may see codes such as C1604 – ECU Hardware Error or C1606 – CAN Time out – ECU Software Error. Let’s go over some of the most common fault codes that you will often get when you scan the vehicle.

1. B1742 – HBA Camera Communication Error

• Description: Communication between the front camera (often part of the Advanced Driver Assistance Systems or ADAS) and the ECU has been interrupted.
• Cause: Faulty camera, wiring issues, or poor connections.

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2. B1743 – HBA Camera Hardware Malfunction

• Description: Internal fault in the front camera module.
• Cause: Defective camera unit or software glitch.

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3. B1744 – HBA Camera Misalignment

• Description: The system detects that the camera’s alignment is outside allowable parameters.
• Cause: Windshield replacement (improper ADAS calibration), front collision damage, or misaligned camera.

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4. U1000 / U1100 – CAN Communication Fault

• Description: General CAN bus communication error, often related to a loss of signal from the camera to other control units (ADAS, BCM, etc.).
• Cause: Loose connection, broken CAN wires, or control module fault.

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5. B1000 – Airbag ECU Internal Fault (sometimes logged during HBA issues)

• Note: This code can sometimes show up because of shared sensor data lines, especially when there are widespread CAN issues.

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6. C1620 – Camera Calibration Required

• Description: The front camera system needs recalibration.
• Cause: Common after windshield replacement or if the camera was removed/reinstalled.

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7. B2A60 – Camera Sensor Fault

• Description: Internal issue with the sensor that affects features like High Beam Assist.
• Cause: Faulty camera hardware.

FAQs

Final Thoughts

The “Check High Beam Assist System” warning message indicates an issue with that safety feature in your Hyundai. This error could create unsafe driving conditions at night due to improper headlight operation. Following these troubleshooting steps and scanning for fault codes can save time and money while ensuring your car remains safe and reliable.