this is a USA forum and all answers are for USA cars
unless you fess up to your country, (non have,but just warning you)!
my guess you meant.
- car dash warning shows Immobilizer light (read the oper guide yet)
- car cranks ok, but will not run. (most immo cut fuel,not spark)
(how to open security, means nothing) try to explain what that means.
my guess, is you're guessing the IMMO is INOP
some cars are fitted with IMMO,
only you know that, and has a dash lamp and the glove box operators guide explains ALL that.
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with no fuel, spark is useless
with no spark, fuel can't burn. Mr, otto cycle engines. ICE.
your engine cuts fuel (the brain) if it thinks there is no spark.
So spark checks are first. if not below.
if the IMMO is unhappy the engine will never run, by DESIGN.