Hi...I have a 09 Yukon XL Denali with headlight issues, the low beam is very dim (if on at all) in the Auto and On position. Fog Lights work but no high beams. Here is a few things I've tried...Tried a new switch, checked relay and fuses. Another odd thing I've noticed is a fan noise at the headlights when they are trying to turn on (when I unlock the car and the lights normally come on, that's when I notice the fan noise most often). I have not changed the bulbs mostly because they are a bear to change but also because there is a dim amount of light all the time.
Any suggestions would be appareciated.
Thanks
there should not be any fan noise if the bulbs are oem, often led replacements will have fans so that could be the issue. these trucks use a bi-xenon bulb which means 1 bulb is used for both high and low beam. you can change the bulbs pretty easy, this video shows you basically how to do it he skips a couple things
1. pop the hood and remove all the bolts across the top of the grill they are 10mm and 2 7mm
2. remove the 2 top 10mm bolts from the headlight housing
3. go to the fender liner and remove the 1 middle 7mm bolt
4 pull the liner back with your hand and reach inside with a short 10mm socket and loosen the last headlight bolt (only loosen it)
5. pull the headlight housing stright forward and out there is one clip that is down inside the area closer to the grill it will just come off as you pull forward.
once you replace the bulbs installation is the exact opposite of above.