It's highly likely that:
* It's a misreading: Double-check the marking on your fuse panel. A similar-looking code might be the actual label.
* It's a custom or aftermarket addition: If someone modified the vehicle's electrical system, they might have added their own labeling.
* It's a typo: The code you provided might be an error.
To find out what the fuse protects, you need to:
1. Carefully examine the fuse panel: Look for a diagram or legend either on the fuse panel cover itself or in your owner's manual.
2. Consult your owner's manual: This is the best place to find a detailed fuse box diagram. It will list each fuse and what circuit it protects.
3. Use an online resource: Search online for a "20XX Chevy Trailblazer fuse box diagram" (replace 20XX with the year of your vehicle). Many websites provide such diagrams.
Without knowing the year and model of your Trailblazer, it's impossible to be more specific. Provide that information for a more accurate answer.
