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2005 chevy trailblazer_lt
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Look in your gve box. There's a series of codes on the door. If UQA is there, you have the bose amp. If so, on most it's located in the rear - under the side panel, and behind the rear wheel well. (use the search for 'bose amp')

In the articles section, it tells how to remove the door panels. Do that and take the working speaker and plug it in where the non working one is - that'll tell you if it's the speaker or not.
 
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