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Check VMCU Communication

WARNING: This page is about a different car, the 2019 Kia Soul EV. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition "ON" (Power Button LED "Red")
  2. Connect KDS and setup the oscilloscope.
  3. Back probe and measure signal waveform of Pin No. 15 (EMS COM) terminal of VMCU main harness connector and chassis ground by using VMI A channel.

    Specification  : Refer to Figure below

    G12813172Courtesy of KIA MOTORS AMERICA, INC.

    Figure) Communication signal waveform between SMK Unit and VMCU.

  4. Is the measured signal waveform normal?

    YES 

    • Fault is intermittent caused by poor contact in Smart Key unit and/or VMCU's connector or was repaired and Smart Key unit and memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

    NO 

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