If it does not make a sound with a 9 volt battery then it is blown. Order a new one if you think it is worth repairing the speakers - however, like origninal car parts - this will probably be a little more expensive than usual ($100 instead of $30).
You might be able to find a "recone kit" for $50. Just make sure you clean it out thoroughly (blow with air) - remove any burned debris or dust. And don't forget to add ferrofluid. However for all the effort involved most people just go for an entire new tweeter assembly.
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