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2023 Highlander Limited Lane Departure Alert Malfunction Warning

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Kevin B. · rep 0 · May 22, 2:18 AM · 1 replies · solved · Question

Vehicle: 2023 Toyota Highlander Limited

Hi everyone,

I'm having an issue with my relatively new 2023 Toyota Highlander Limited. For the past few days, I've been getting a 'Lane Departure Alert Malfunction' warning message on my multi-information display. Sometimes it appears right after starting the car, and other times it pops up while driving on the highway.

I've tried cleaning the windshield in front of the camera, but it hasn't made a difference. All the other Toyota Safety Sense features seem to be working fine, but this specific warning is persistent. Has anyone else experienced this with a newer Highlander or other Toyota models? What could be causing this?

Thanks for your help!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 2:18 AM

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ClearTheCode admin answer:

It's definitely frustrating to have a warning light on a new vehicle, especially for a safety system like Lane Departure Alert (LDA) on your 2023 Toyota Highlander Limited. These advanced driver-assistance systems (ADAS) rely on precise sensor readings, and even minor issues can trigger a malfunction warning.

Here's a breakdown of potential causes and what to do:

  1. Check for Obstructions (Beyond Windshield): While you cleaned the windshield, also ensure there are no stickers, tint, or anything else on the inside of the windshield that might be blocking the camera's view. Also, check the front bumper area for any debris or damage that might affect the radar sensor (if your LDA system integrates with radar for other TSS features).
  2. Diagnostic Scan: A professional diagnostic scan using a tool capable of reading body control module (BCM) and ADAS system codes is essential. Standard OBD-II scanners might not pick up these specific codes. Look for codes related to:
    • C1A60: Front Radar Sensor Malfunction (if applicable)
    • C1A61: Camera Sensor Malfunction
    • U0100/U0121: Lost Communication with ECM/ABS (less likely for specific LDA, but possible if a network issue)
  3. System Recalibration: Sometimes, after a minor impact, windshield replacement, or even significant suspension work, ADAS sensors (especially the camera) might need recalibration.

Common Causes:

  • Camera Obstruction/Damage: Even a small chip, crack, or persistent smudge on the windshield in the camera's field of view can cause issues. The camera itself could also be faulty.
  • Sensor Misalignment: The camera or radar sensor (if used for LDA) could be slightly misaligned due to a bump, vibration, or manufacturing defect.
  • Wiring/Connection Issues: Loose or corroded wiring to the camera or radar unit can cause intermittent communication errors.
  • Software Glitch: Less common, but a software bug in the ADAS control module could trigger false warnings. A software update might be available.
  • Faulty ADAS Module: The control module for the Lane Departure Alert system could be failing.

When to See a Shop:

  • Promptly: While the vehicle is still drivable, a malfunctioning safety system should be addressed. You're losing a key safety feature.
  • Dealership Visit Recommended: For ADAS issues on newer vehicles, a Toyota dealership is usually the best option. They have the specialized diagnostic equipment, factory training, and software to accurately pinpoint the problem, perform necessary recalibrations, and access any relevant technical service bulletins (TSBs) for your specific model year. Do not attempt to repair or adjust these sensors yourself, as it requires precise calibration.
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