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Constant CMBS and LKAS System Warnings on 2022 MDX A-Spec

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Mike T. · rep 0 · May 26, 3:55 AM · 1 replies · solved · Question

Vehicle: 2022 Acura MDX A-Spec

I'm having persistent issues with the advanced safety systems in my 2022 Acura MDX A-Spec. Almost every other drive, I get warnings for the Collision Mitigation Braking System (CMBS) and Lane Keeping Assist System (LKAS). The dashboard displays messages like "CMBS System Problem" or "LKAS System Failure".

Sometimes these warnings pop up seemingly at random, even on clear days with no obstructions. Other times, they appear during heavy rain or snow, which I understand could be normal, but they don't clear even after the weather improves. It's making me lose confidence in the safety features.

Is this a common bug for the 2022 MDX A-Spec? What could be causing these intermittent warnings, and what steps should I take to get this resolved? I'm hoping it's something simple and not a major sensor replacement.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 26, 3:55 AM

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ClearTheCode admin answer:

Intermittent warnings for advanced driver-assistance systems (ADAS) like CMBS and LKAS on your 2022 Acura MDX A-Spec can be concerning. These systems rely on a complex network of sensors and cameras, and several factors can trigger these alerts:

  1. Sensor Obstruction: The most common cause is a blocked radar sensor (located behind the Acura emblem) or a dirty windshield camera (behind the rearview mirror). Even a small amount of dirt, ice, snow, or a bug can obscure their view.

    • Action: Ensure the Acura emblem area and the windshield in front of the camera are always clean and free of obstructions.

  2. Misalignment or Damage: If the vehicle has been involved in even a minor fender bender, or if a sensor has been bumped, it could be misaligned. This would cause the system to receive incorrect data.

    • Action: Visually inspect the front radar sensor area and the windshield for any signs of damage or misalignment. Even a windshield replacement can necessitate camera recalibration.

  3. Battery Voltage Issues: Low battery voltage or a failing battery can sometimes cause various electronic systems, including ADAS, to malfunction or throw erroneous codes.

    • Action: Have your vehicle's battery and charging system tested, especially if you experience other electrical glitches.

  4. Software Glitches or Module Faults: Less commonly, there could be a software bug in the ADAS control module or a fault within the module itself or its wiring.

    • Diagnostics: A diagnostic scan might reveal a 'U' code, such as U0300 (Internal Control Module Software Incompatibility) or other manufacturer-specific codes related to ADAS modules.

When to See a Shop: If cleaning the sensors doesn't resolve the issue, or if the warnings persist regardless of weather conditions, it's imperative to take your 2022 MDX to an authorized Acura dealership. ADAS systems are highly sophisticated and require specialized diagnostic tools and calibration equipment. An Acura technician can:

  • Read specific ADAS diagnostic trouble codes.
  • Check for any technical service bulletins (TSBs) or recalls related to these systems.
  • Perform sensor recalibration, which is often required after certain repairs or even minor impacts.
  • Diagnose and replace faulty sensors or control modules if necessary. Do not ignore these warnings, as they indicate a potential compromise in your vehicle's safety features.
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