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Home >> Hyundai >> 2021 >> Ioniq Hybrid SEL >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> ESC/AHB Diagnosis (HEV) >> DTC C1638-08: ACC Communication Error >> Wiring Inspection >> Signal Circuit Inspection >> Open Check

Open Check

  1. IG "OFF".
  2. Disconnect IBAU and SCC connector.
  3. Measure resistance between CAN HIGH terminal (LOW terminal) of the IBAU harness connector and CAN HIGH terminal (LOW terminal) of the SCC harness connector.

    Specification:  Approx. below 1Ω

  4. Is the measured value within specifications?

    YES 

    NO 

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