Q: How do I remove the Headlight Bulb for Chevrolet Trailblazer and Buick Rainier?
A: Remove the Headlight housing and the access cover from the headlight housing. Twist the bulb holder counterclockwise and withdraw the bulb holder and connector from the housing. Unplug the electrical connector from the bulb holder. Handling the new bulb only by the bulb holder portion, reconnect the electrical connector, and insert the new bulb/holder into the housing. Twist the holder clockwise to lock it in place, then install the cover. Installation is the reverse of the removal.