To remove the front bumper, start by pulling back the front portion of the fender-well liner. Apply the parking brake, raise the vehicle, and support it securely on jackstands. Disconnect the cable from the negative battery terminal. On models equipped with fog lights, disconnect the electrical connectors at the fog lights on the back of the bumper cover. On Avalon models, remove the grille separately by removing the grille retaining bolts and clip. Carefully pull the grille out and disengage the remaining mounting clips. Remove the radiator support cover mounting clips and cover. Detach the screws or pushpins securing the top, bottom, and sides of the bumper cover. There are two locking pins located at the front portion of the fender well liner where it meets the bumper. Rotate the pins 90-degrees, then remove them. Pull the fender well liner back and remove the bumper cover-to-fender mounting bolt. There are four clips where the cover meets the front of the fenders. Pull outward on the ends of the cover to release the clips. Installation is the reverse of removal. Make sure the tabs on the back of the bumper cover fit into the corresponding clips on the body before attaching the bolts and screws. An assistant would be helpful at this point. To remove the rear bumper, work under the vehicle and detach the plastic pins securing the lower edge of the bumper cover. In the rear fenderwells, remove the screw(s) securing the front edge of the cover to the fenderwell. On some models, the plastic fenderwell liner must be released for access. Open the trunk lid and remove the fasteners securing the bumper cover in each corner. Disconnect the electrical connectors to the parking system or back up camera, if equipped. From under the vehicle, remove the screws securing the lower edge of the bumper cover. Pull the bumper cover out and away from the vehicle. Use a small screwdriver to pop the center button up on the plastic fasteners, but do not try to remove the center buttons - they stay in the ferrules. Where studs/bolts stick through the body, use a plastic hammer to tap them out of the body. Installation is the reverse of removal.