Check VMCU Communication

WARNING: This page is about a different car, the 2017 Kia Soul EV. However, it is still accessible from the selected car via links, so may be relevant.

Ignition "ON" (Power Button LED "Red")
Connect GDS and setup the oscilloscope.
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 Fig 1 below

Fig 1: Scantool Display - Communication Signal Waveform Between SMK Unit And VMCU
Courtesy of KIA MOTORS AMERICA, INC.
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
- Go to "SMK Status Information" procedure below.