Mines a v8, not used for a few weeks, jumped in to go for a spin and won’t turn over, I had the hazard lights flashing fast plus the immobiliser light .
and all the dash lights before then, I thought it might be a low voltage issue.
So charged battery and retried.
it did the same all lights lit and stay on for a minute the it’s just the hazards and immobiliser , it won’t turn over, could it be the auto trans switch ?

 

It could be a popped inertia switch or the vehicle thinks its been broken into. I don't know how to deal with the security system, but if its the inertia switch just popped it back into place and you should be good to go! (its located DS on a black plate and will be near the SAI if your vehicle has it)