Depending on the year of manufacture, the attachment points may differ.
Front bumper
-open the hood.
-under the hood, Unscrew the four screws and remove the grille up.
-under the grille take out the three pistons (inserted from top to bottom) that secure the upper part of the bumper.
-at the bottom of the bumper, unscrew the screws and take out the caps (twisted and inserted from the bottom up).
-turn the wheels to the side.
-in the wheel wells take out the caps that secure the fender liner (front).
-unscrew one screw on each side that secure the corners of the bumper.
-we release the latch in the wings (pull the corners of the bumper towards you).
-with an assistant, pull the bumper forward (look for the wires).
-disconnect electrical connectors.
Rear bumper
-open the trunk lid.
-remove the rear lights.
-in the opening of the trunk, Unscrew the four screws.
-at the bottom of the bumper take out eight caps (inserted from the bottom up).
-in the wheel arches, we release the fender liner (rear).
-unscrew one screw on each side that attach the corners of the bumper to the wings.
-we release the clips under the rear lights.
-we release the latches in the wings and under the rear lights (pull the corners of the bumper and the sides of the lining towards you).
-with an assistant, pull the bumper back (look for the wires).
-disconnect electrical connectors (if any).
How to remove the front and rear bumper Toyota Alphard (2002-2008)
How to remove the front and rear bumper Toyota Alphard (2015+)