I think one clue to look for is the Security light. It will either remain
on -- or flash depending on how the decoder determines a mis-match from the
PASS-Key's resistor pellet.
If you're fairly certain the PASS-Key is correct, clean and dry there could
be a problem with the ignition switch or the sensor that signals a start-up
I would check and clean the battery cable contact points and inspect the
cable and connections to the starter motor.
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