2016 Kia Sedona Intermittent No Crank No Start

Perhaps not a laborious diagnostics but for some that are new to push to start systems may have you chasing your tail. Customer complain was a No Crank/No Start condition for this Kia Sedona. Checked the condition and car would start, after many attempts I had the car fail a couple of times where it would not start. At once it almost led me to believe it was the starter as there were two times when I can hear the starter kind of smack the flywheel but very poorly, like it tried but gave up in a split second. I checked the starter relay and it was good. I connected the scan tool to monitor the ignition switch. This is a push to start so only the scan tool can tell you what the module is seeing from it or tapping into the wires but they are hard to reach and are time consuming. I monitored ignition events and out of the two ign, every now and then, ign1 would not send a signal when the button was pressed. The other way to know without the scan tool that this was happening was to look at the cluster and if the accessories did not fully load, then the signal was not received and the Kia animation car would not show on the cluster. Every time the Kia animation car did not load, the car would not crank/start and this was my test to see how often it would fail, I can say that 80% of the times the car would start. I immediately ordered a switch because I knew the problem had to be with the contacts, per Mitchel diagram, these two signals (ign 1 & 2) are actual switches when the buttons are pressed. I could not leave this alone and decided to disassemble the switch to see what was causing it and I could see contamination and perhaps corrosion indicating an issue. 

All in all: OEM push to start switch fixed the problem.