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I have changed many of these...Everytime I inspect one it is always the light that is faulty...and that is all different makes..I have found some have a left and right fuse but it was always the light..The mirror will slightly pivot..carefully pivot mirror slightly inward you will notice it is only held on with plastic clips..Use a good flashlight.....you can actually see behind mirror better at night with a direct beam small led pocket light...use a pocket screwdriver and carefully pry the clips away from mirror while softly pulling on mirror...All you have to do is release the 2 upper and lower outside clips and it will slide out..Then you will see the 2 screws that mount the signal light to the mirror housing..just remove and replace..re-install all the way it was removed...Do it carefully....easy job...
I'd call a GMC dealer and ask for the parts department. I'd ask about the availability and price of the driver's mirror turn signal bulb. That might tell you if that bulb is replaceable. You could also ask that same delaership's service department about the labor cost to replace the bulb. If the plastic cover below the mirror will not snap off, you would probably have to remove the mirror from the door and take it apart to replace the bulb. Depending on the friendliness of the GMC service or parts department , they might tell you what to do here.
remove the mounting screw on the lens, then remove the top 2 bolts holding the headlamp, pull headlamp out to gain access to the mounting nut on the turn signal. Remove the nut and the turn signal light will pull straight out allowing you to replace the bulb.
If the turn signals on the truck work correctly, this would be a bulb issue.
The best directions I have found with pictures are from Muth ( mfgr of signal mirrors ) : www.kwmuth.com Enter truck info, and on the product listing page are the install directions for download in PDF format. Download, and use the directions to the glass removal. Once the glass is out, you will see the bulb holder for the signal on the edge of the glamor cap, think this is a bulb type 39 ( ??) Have seen some people just move the glass all the way in ( so the gap is at the signal side of the mirror head ), and work it this way, I have not done this myself.
I had the same problem don't take it anywhere else but VW because to fix this problem they have to take the door and the mirrior apart and if you take it somewhere else they wont put it back together right.
I'm pretty sure the light is part of the glass. The mirror glass is available seperately. Check Ebay or tascafordparts.com for a discounted part. Or, car-part.com for used one. Page with * is lowest price.
here is 2003 Nav. I don't have 2004. May be similar. please give good rating if this help. Good luck
----- Removal and Installation
Position the mirror glass to obtain a gap at the top edge of the mirror and carefully pull the top edge of the glass away from the mirror housing.
Disconnect the heated mirror electrical connectors.
Remove the exterior mirror motor screws and exterior mirror motor.