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yes,4 separate bulbs,2high beam-2 low beam
DRL.
Because there are two light bulbs and the low beam bulb is burned out
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open hood look behind head light fixture you will see two round rubber out side one is your low beam inside one your high beam. remove find bulb twist clock wise an remove
Any DTC's, and ensure all light bulbs and fuses are functioning properly (ensure they are low beams, not DRL's)
The switch itself is located within the multifunction-switch and is operated by pulling the turn signal stem toward you.
Low Beam: 9006 High Beam: 9005 See sources and related links below for more information on the 2006 Chevrolet Trailblazer bulb/lamp part numbers.
first,unscrew it from the back,2nd,buy a bulb,3rdunplug the wires insert bulb then plug wires in again. it should work.
Remove top of air cleaner and filter remove cap from back of light, twist and remove bulb.Reinstall don't touch bulb with fingers on glass.
what about the low beam?
The bulb can be removed from the rear of the headlight assembly. Remove the boot first then twist the bulb to unlock it. If you cannot access the bulb you can remove the headlight assembly from the truck by pulling up the tabs on the two clips that hold it in place. One on the top corner near the midline of the truck and one on the side of the assembly. You may have to pop the grill out to allow easy access. www.trailvoy.com all the answers for your Trailblazer from enthusiasts.