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Hello and welcome to JustAnswer.
My name is Vlad.
If you starter does not engage, I would first check if you starter is Ok and if it receives power from the starter relay.
The quick way to do it is to remove the starter relay from the underhood fuse/relay center and quickly bridge terminals 30 and 87 of the relay socket to check if starter clicks and turns the engine over . Just make sure it is in Park and all clear from belt.
If it engages and cranks when you bridge the relay, then you must have a problem with the starter relay control. In this case next step is to connect the scan tool and check for trouble codes as the relay is controlled by engine computer and more electronics involved.
If the starter does not engage, then you will have to check for power at the starter motor and wire continuity between the relay and starter and if all is good, then the starter itself is faulty.
I might be offline due to time difference ( I am in Australia), but will reply back as soon as I am back. Thanks
Ok, can you check if you have +12V power at the the terminal 30 of the relay socket? Just use a test light or bulb with two wires
Ok, check Fuse J17 40A make sure it is not blown. If the fuse is OK, then next step is to get to starter motor and check if you have +12V battery power on the thick cable at the starter motor and you have +12V on the small wire when the relay contacts bridged.
It could be a challenge as not good access and you might need assistance to jumper terminal when you ready to check at the starter.
Test light or just a bulb with two wires attached is better as multimeter can mislead you.
ok, will check your reply later
The starter relay should be located in the main fuse relay box. It is called TIPM ( Total Integrated Power Module). You should have identification on its cover, I mean relays have numbers and fuses have numbers and layout should be printed on the back of the cover with all description.
It does sounds like might have an intermittent starter relay issues, like burnt terminals and moving it around just restored the connection. It is hard to say as if it starts now.
This additional relay center is for Daytime running light relays, tailgate unlock replay, air suspension relay and headlamp washer if applicable etc.
The starter relay is located within the TIPM.