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2021Trailblazer RS AWD Scarlet Red Metallic
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My guess would be behind the dash, but like you I can't find any info.
 

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Yeah the old TrailBlazers had them inside one of the rear trim pieces. It seems like many of the newer GM vehicles have the amp inside the dash. I've looked inside the cargo trim and found a fuse box, but nothing else.
 

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2021Trailblazer RS AWD Scarlet Red Metallic
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Based on these diagrams the amp is located behind the dash. Part number 2 is the Bose amp.
465
 

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I wonder what the specs are on it. I looked on Bose site but doesn’t say anything
Bose doesn't like to post specs on their products. I've run into this problem before trying to find info on other Bose equipped vehicles.
 

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If the Trailblazer audio system is anything like the Blazer you might have to disconnect the ANC system to prevent problems. ANC will try to cancel out noise that comes from non stock speakers, amp, subs, etc. ANC is only on AWD models.

I would try to make everything as "plug & play" as possible to avoid problems. Crutchfield has a few wiring harnesses that will integrate with the system.
 

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I got the activ but the Bose is not all that great. It’s all being replaced.
Replace your stuff yet? I replaced my speakers already, they were trash in the non Bose system - 20 Watts. The amp btw is in the rear cargo area on the passenger side. I posted on the forum a PDF on how to access everything far as the audio system goes.
 

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Discussion Starter · #15 ·
Replace your stuff yet? I replaced my speakers already, they were trash in the non Bose system - 20 Watts. The amp btw is in the rear cargo area on the passenger side. I posted on the forum a PDF on how to access everything far as the audio system goes.
no not yet. I went to order the navtv unit and they are upgrading it so I have to wait till that’s available. I’m going big. Once it’s all done I’ll post pics
 
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