1994 GMC Safari Owner's Manual - Page 258

4. Press the tab and turn the socket to the left to remove the socketfrom the bezel.If the socket does not have a tab, turn the socket to the left to remove the socket from the bezel. 5. Pull out the bulb ... and replaceit with the new bulb. 6. Reverse steps 1-4 to reinstall the taillight. Center High Mounted Stop Lamp (CHMSL) Your CHMSL bulbs are not replaced separately. You must replace the entire unit. See your GM dealer for areplacement CHMSL assembly. $\s1 6-40