Depending on the year the site of attachment differs.
Front bumper
The bumper is removed along with the grille.
-under the hood take out the seven rivets (inserted upside down) and remove the cover plate over the grille.
-under the pickguard, Unscrew the screws and take out the caps (twisted and inserted top to bottom) that secure the top part of the bumper and the grille.
-on the perimeter in the bottom part Unscrew the screws (spun up) that secure the lower part.
-wrenched the wheel to the left or right side, depending on which side of the bed will be dismantled.
-wheel arches take out two pistons on each side and removed the wheel arches from the bumper.
-attach the fender liner to the side and Unscrew one screw on each side (spun upwards) holding the corners to the wings.
-with the assistant release the latch in the wings (pull on yourself), and gently pulls the bumper itself.
-remove the connectors from the fog lights (if any).
-remove connector from the PDC (if any).
-if you have headlight washers, disconnect the hose (should prepare a container, which will merge a liquid).
Rear bumper
-in the opening of the trunk, near the rear lights, thin flat screwdriver and pull out two plugs.
-under the plugs, Unscrew the screws.
-on the perimeter in the bottom part Unscrew the screws and take out the rivets that secure the lower part of the bumper.
-wheel arches vacated lockers and Unscrew one screw on each side (spun upwards) holding the corners to the wings.
-with the assistant release the latch in the wings (pull the corners themselves).
-gently pulls the bumper itself.
-remove the connectors from the sensors (if any).
How to remove front and rear bumper Lexus GS 2 (1997-2005)
How to remove front and rear bumper Lexus GS 4 (after 2012)