Usually there not replacable but on the other hand when we at the dealer take them out we send them to a gm authorized electronic repair shop that solders in the led lamps and sends them back. I myself have done this to my own cars. if you feel good enough to try opening the unit and looking to see what the lamp is and go to radio shack and pick up a bulb.
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Most clock adjustment buttons are located on the GM radio below the volume and on/off knob. Look for the hour and minute buttons below and press corresponding buttons to either set the hours and minutes or both. There will either be AM or PM on LED window indicating morning or night.
There are two pins on the righ and left side of each Headlight. Turn the pins forward then pull all the way up and out. The Headlight should easily come out. You now will have complete access to your daytime running light bulb socket. Twist out and replace bulb. To replace assembly simply go in reverse order keeping in mind that the holes need to be lined up when inserting pins. Thank you for using fixya and be safe.
check your manuals guide book on reprogramming the radio and where would you find the fuse for the radio first check the fuse then reprogram if this information has been helpful please let us know good kuck
2002 GMC Yukon Car Stereo Wiring Guide
Car Radio Battery Constant 12v+ Wire: Orange Car Radio Accessory Switched 12v+ Wire: Yellow Car Radio Ground Wire: Black Car Radio Illumination Wire: Brown Car Stereo Dimmer Wire: Gray Car Stereo Antenna Trigger Wire: N/A Car Stereo Amp Trigger Wire: N/A Car Stereo Amplifier Location: N/A Car Audio Front Speakers Size: N/A Car Audio Front Speakers Location: N/A Left Front Speaker Positive Wire (+): Tan Left Front Speaker Negative Wire (-): Gray Right Front Speaker Positive Wire (+): Light Green Right Front Speaker Negative Wire (-): Dark Green Car Audio Rear Speakers Size: N/A Car Audio Rear Speakers Location: N/A Left Rear Speaker Positive Wire (+): Brown Left Rear Speaker Negative Wire (-): Yellow Right Rear Speaker Positive Wire (+): Dark Blue Right Rear Speaker Negative Wire (-): Light Blue