Before I did anything I'd get the computer codes.

Cycle the key on-off-on-off-on (without starting engine) then count the light flashes. the codes will be 2 digits. Usually you will see a 12 (one flash, a pause, then two flashes) and a 55 (five flashes, then a pause and five more flashes. there will be a longer pause between codes).

Tell us what you got.

They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.