Open the hood, remove the pins holding the headlamp assembly, remove headlamp assembly, now you can reach in and remove the day time bulb socket assembly to replace the bulb. Repeat procedure on other side.
There are two screws in the tailgait jamb, just remove them and the lense comes right out exposing the bulbs.
Check bulbs and switch
If by "dim headlights" you mean low-beams... the bulbs are bad and must be replaced.
Remove the headlight assembly to gain access to the bulbs.
You get under the running boards right under the lights. there is a little plastic housing. pull this housing down and change light bulb is that easy.
You will need to remove the instrument panel cover. Remove the retaining screws from the speedometer. The lightbulb will be on the back of the speedometer.
Remove the headlight assembly to gain access to the bulbs.
The daytime run lamps are your high beam bulbs with a module that cuts the amount of amperage that just dims the bulbs. Just change high beam bulb.
there is a number of things that could cause this. here are a few easy ones to check. is the e-brake fully disengaged. are the bulbs burnt out. is the wiring harness plugged into the daytime lights bulbs and in good condition. if these check out, you may have a fault in the daytime running light module.
There are many bulbs on a vehicle, need to know which bulbs you want to change.
If you unscrew the headlights, You will see tiny little screws behind that. They may have little nipple like coverings in them. Unscrew these and you can replace the bulbs. Look carefully as these screws are tiny
2002 GMC Sierra daytime running light (DRL) bulb replacement: Purchase the correct replacement daytime running light (DRL) bulb(s) first, before disassembling the vehicle. See sources and related links below for replacement bulb information. Then consult your owner's manual for the daytime running light (DRL) bulb replacement procedure. As simple as it sounds, the owner's manual is the best place to start for bulb replacement instructions and illustrations. You may want to consider replacing both left and right at the same time in order to keep brightness and color equal (optional).