onstar fuse location

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cmc76

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got a superchip tuner, cheap, i went to install, tells me i need to pull onstar fuse.
google give me the same runaround and " are you afraid of big brother" responses.

which box, underhood or in dash. a number would be helpful. 04 tahoe z71.
thanks
 
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cmc76

cmc76

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ok, found the info fuse, its shown in many of the manuals.
during the install, i get an application not supported error 038.

any ideas?
 

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