From the inside, behind the panels.
Lift the hatchback and remove the 2 screws holding in the taillight assembly. You can then access the light bulbs from the rear.
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When you open the hatchback look behind where the light is and you will see a small hole. Unscrew the screw that it is there. You also need to unscrew another screw that is beside the light on the outside (top right). Then you just pull the whole light assembly off the car. Next disconnect the wire from the back of the light bulb assembly. Next, twist the light bulb assemble and pull it out. You now have access to the bulb.
how to replace a front fog light on a ford focus
There are two screws holding the housing: one beside the plastic cover, and the other in the top of the luggage compartment. Take these out, and the cover should come off.
On a 2012 toyota Highlander, How do you replace tail light Assembly
To replace the upper light on the hatchback door, the plastic trim piece just snaps in place, once that is removed the light assembly snaps down to reveal the bulb. The stop lights on the body have the attaching screws covered by plastic plus, just pry them out and remove the screws and the assembly can be removed
You open up the hatchback and take the carpet loose from behind the lens assembly. Take the nuts off the back of the lens assembly and pull the whole unit out towards the back of the car. Pull the bulb socket out of the assembly and replace the bulb. Reverse to put back.
Open the hatchback. Behind each tail light assembly is a round cover. Remove it and you'll find two big plastic hand-turnable nuts. Remove those and you can pry the assembly out of the car.
On my 2005 ford focus ZX3 I had to open the hatchback - unscrew the Phillips bolt and then look up underneath the light housing / hatchback for a plastic WINGNUT. Unscrew that and the light housing compartment will simply lift out. Then twist the BULB housing couterclockwise until the bulb comes out. Then pull the bulb straight out. Repeat backward the process to install.
There are two screws on the outside of the tail light assembly. Remove these two screws (keep them) and the assembly should be able to be removed from the truck. Carefully twist the socket out of the tail light assembly. Pull the old light bulb out of the socket and replace with new. Insert the tail light assembly into position in the truck bed and replace the two screws.