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2002 chevy trailblazer_lt
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517 Posts
Could be your ignition switch going bad. Common problem on some GM products. Are there a lot of other keys on your fob? A lot of extra weight bouncing and pulling on the the switch can cause it to fail. Not sure about #2. I would be looking for a poor ground in the back speaker.
 

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2002 chevy trailblazer_lt
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517 Posts
I'm not much of a point-to-point guy myself, but having been on the forum for a while I've seen this problem discussed before. There may even be a how-to somewhere o here.
 
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