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Just under the hood, pop it open, by the battery, there is this black box, snap it open by pessing the flaps on the sides, then there are a couple of screws, try open that cover up, and if not unscrew the screws, and just underneath the cover there is a diagram, the #46 relay is the HDM (headlamp module) try swapping it with #45 the coolant relay (just temporarily) if the hadlamps work back on, it means the #46 relay is blown, replace it, will cost around 30 to 40 bucks on your favorite auto parts store.
What else can I help you with?
The headlights on my 2004 Chevy trailblazer quit working. All other lights work and the fuses are good. what could be the problem?
relay in the hood fuse box HDM relay (Headlamp Driver Module)
What is a EAP relay for in 2004 Chevy Trailblazer?
Electrically Adjustable Pedals
How do you replace a starter on Chevy Trailblazer?
Where is the starter on a 2004 Chevy trailblazer.
How many quarts of oil in a 2004 Chevy Trailblazer?
The 2004 Chevy Trailblazer holds 7 quarts of oil.
Chevy trailblazer 2004 gauges not working?
If your Chevy trailblazer 2004 gauges are not working, check your fuel pump.
Where to find MAP sensor on 2004 Chevy Trailblazer?
where is map sensor on 2004 trailblazer
Where is vacuum hose located on 2004 trailblazer?
I need a diagram for the vacuum lines on a 2004 Chevy trailblazer
What is the labor time to change a thermostat on a 2004 Chevy Trailblazer?
remove and replace engine coolant temperature(ect)/chevy 2004 trailblazer
How fast is a 2004 Chevy Trailblazer?
105mph
Chevy trailblazer 2004 air vents do not blow air?
If the air vents of the Chevy trailblazer 2004 are not blowing air, have the fuel pump checked.
How do you remove an oil filter from a 2004 Chevy Trailblazer on a 2004 Chevy Chevy Trailblazer 4.2 liter?
Seeing as your not that savvy.. take it to a 'lube shop let them change your oil
Lug pattern for a 2004 Chevy Trailblazer?
6x127
