2015 ML350 4matic will not start

Question edited for clarity, toss in a load of CAPS.
Question moved to model category..

Did you disconnect the battery? I sounds like you upset the engine immobilizer. If so, it will need resetting.

Or check for DTCs, (diagnostic trouble codes) with a pro grade scan tool computer.

https://www.google.com/search?q=mobile+auto+electrician+near+me

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Question moved from Spanish company Seat (pronounced See-At) to Malibu category.

The passenger seat airbag only fires in a crash if there is someone sitting on the passenger seat. There is a sensor in the seat cushion that register a person sitting there. Under the seat there will be a connector, take it apart and spray it with electrical contact cleaner.

Lots of help in this link.

https://www.google.com/search?q=2015+Hyundai+Tucson+won%27t+start

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See my tips at link below. Report back on test results.
Do It Yourself Diagnosis and Repair

go to your local dealer ship. may still be covered under Nissan warrante, since the car is 2015. 3 years, 36000 miles bumper to bumper.

I would think either a salvage yard or the dealer ship should be able to help you.

what do you mean by ship
(my guess is car was never ever dealer serviced as delivered by rail?)
this is covered in the FSM, ever seen one,
lots of steps, including adding missing fuses.

the most odd question ever posted in 10 years, love em' !

check that the battery posts and terminals are shiny clean and tight. Have a load test done on the battery as it indicates a bad cell.

Sounds like your battery is on the way out. Have a load test done on battery & voltage check on alternator. If all works well once it starts, I'd bet on the battery, but load test will confirm, which they will do for free usually if your buying the battery from them.