Detection is performed by means of a highly sensitive membrane
The sensitivity of the membrane may be affected if coated with an unsuitable product . Detection is then incorrect or non existent .
General
Vehicles with non painted proximity sensors
Non painted proximity sensors must never be covered with paint
Remove or cover the proximity sensors when repairing the paint on the bumper
Vehicles with pre-painted proximity sensors
To ensure that obstacle detection is not incorrect or non existent , special "to be painted" proximity sensors must only be covered with a coat of paint with a maximum thickness of 120 microns .
A paint thickness greater than 120 microns will lead to operating problems :
.. No detection .. Incorrect information given to the driver
Painting of the parts
New panels
New bumpers and "to be painted" proximity sensors are prepared in order to be coated directly with finishing paint . New proximity sensors are supplied with a 25 micron thick coat of primer .
Painting a new "to be painted" type of proximity sensor
Paint bumpers and proximity sensors separately
Degrease the surface using a cloth soaked in "pre-painting degreaser"
Wipe with a dry cloth .
CAUTION : Never use an aggressive thinner which may remove the primer
Single coat painting
H.S. paint (high solid) : apply one coat of paint
M.S. paint (medium solid) : apply 2 coats of paint
Two-coat paints
Base colour
Apply 1 - 3 coats of paint depending on colour covering power
Superlustre finish
Apply one coat of high solid (HS) varnish
Apply 2 light coats for standard varnish
Avoid overloading and runs when apply finishing products
Touching up paint on bumpers
CAUTION : Never apply another coat of paint to a sensor which already has one coat of finishing paint . remove or mask the proximity sensors before applying paint .