Buick Cascada2018 Owner's Manual page 201

200 Vehicle Care
4. Insert the bulb holder into the
taillamp assembly and turn it
clockwise.
5. Close the cover by inserting
the fastener clips first. Lock the
cover by turning the screw
clockwise with a tool.
Rear Position Lamps
1. Open the trunk lid.
2. Release the cover in the side
trim panel and remove.
3. Remove the bulb holder by
turning it counterclockwise.
4. Remove and replace the bulb.
5. Insert the bulb holder into the
housing and turn clockwise.
6. Attach the side trim cover.