Depending on the model year and body type (restyling, universal) the attachment is slightly different.
Front bumper
-open the hood.
-under the hood, Unscrew the four screws (spun down) that secure the grille.
-around the bottom part Unscrew the six screws and remove two pistons (twisted and inserted from the bottom up).
-depending on which side we will disassemble, wrenched the wheel.
-wheel arches Unscrew two screws on each side that hold the edge of the bumper
-we release bumper latches in the wings (pull the corner towards you).
-with the assistant pulls the bumper forward (don't want to break the wires).
-snap together the connectors of the equipment (if any).
Rear bumper
-open the trunk lid.
-in the opening of the trunk, Unscrew the five screws.
-from the trunk, Unscrew the screws and take out on itself the tail lights.
-the rear lights take out the caps.
-Unscrew the screws that attach the lower part (spun up)
-wheel arches Unscrew the screws that secure the edges of the bumper.
-we release the latch in the wings (pull the corners themselves).
-with the assistant pulls the bumper backwards (look for wires).
-snap together the connectors of electrical equipment.
Universal
How to remove front and rear bumper Renault (Dacia) Logan 1 (2004-2013)