go to a garage....
I did this with my 1996 Lumina APV. If you have rear speakers, remove the speaker cover(s), remove the speaker and reach in and find the mechanism, turn it to open. May have to do simultaneously for both sides. Then remove the tailgate panel and repair.
If the short is in the speaker itself just replace the speaker.
Open your trunk and check the rear speaker wires - chances are something banged into them and damaged the wiring creating a short. If so, you can fix the wire or clip it (in which case you would lose sound in one rear speaker but your radio will work again).
hottly
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the speaker's at the lighthouse right at the bottom of your screen at the left
To fix a Jaguar S type heater, check the diverter mechanism. It shunts air through the heater core, which may not be operating properly.
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Fix the lighter? HA! Just buy a new Jaguar.
Fix the lighter? HA! Just buy a new Jaguar.