The Body Control Module (BCM) location in a 2004 Chevy Trailblazer depends slightly on the trim level and options, but it's generally found
under the passenger-side dashboard. You'll likely need to remove the glove box and possibly some other trim pieces to access it.
It's a good idea to consult a repair manual specific to your year and model Trailblazer for precise instructions and diagrams. These manuals often show the BCM's exact location and the steps to access it safely. You can find these online or at auto parts stores.
