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Dan, Technician
Category: Chevy
Satisfied Customers: 23473
Experience:  Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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I have a 2007 Chevy Trailblazer SS and my low beam headlights

Resolved Question:

I have a 2007 Chevy Trailblazer SS and my low beam headlights won't come on. We changed the bulbs and checked the fuses what else could be wrong with it?
Submitted: 6 years ago.
Category: Chevy
Expert:  Dan replied 6 years ago.
Try to swap the HDM relay with another relay to see if that helps if not verify one wire on the relay has good power, one has good ground. If everythings is good up to this point then the problem is likely the body control module. But the HDM relay is one of the most common causes. Let me know if you have questions, thanks.
Dan and 3 other Chevy Specialists are ready to help you
Customer: replied 6 years ago.
Where would I find the HDM relay?
Expert:  Dan replied 6 years ago.

Its under the hood, here is a picture.