seems like security system will not allow us to start the car... on 2002 Isuzu Rodeo

rodeo 2002 LS that had a potential overheated engine issue (only 500!!!) - but now that we want to start it to test the what could be wrong - it won't start - security light flashes - turining lights flash - battery checked and fully charged - tried to cross the the starter but - difficult because where it is located - any ideas?

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2 answers
Have it scaned for any trouble codes.
seek a diag and est thats were to start.you will save time and money in the long run