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Home >> Hyundai >> 2018 >> Kona Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 141 (Auto Headlamp Leveling System Diagnosis) >> DTC C1604: ECU Hardware Error >> Component Inspection >> ECU (AHLS) Inspection

ECU (AHLS) Inspection

WARNING: This page is about a different car, the 2021 Hyundai Kona. However, it is still accessible from the selected car via links, so may be relevant.
  1. Plug GDS to Data Link Connector (DLC).
  2. Start the engine and turn on the auto headlight system.
  3. Clear the DTC using the GDS.
  4. Did the same DTC return?

    YES 

    • Replace the AHLS ECU with an usable one. If the AHLS ECU works properly, replace it and go to "VERIFICATION OF VEHICLE REPAIR ".
    • Complete the download process for parameters (vehicle information) at 'Optional Test' after replacing the AHLS ECU.

    NO 

    • Fault can be intermittent. Or, the AHLS ECU's memory was not cleared after repair. Thoroughly check connectors and wire harness for looseness, poor contact, bending, corrosion, deterioration, or damage.
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