Vauxhall VECTRA Owner's Manual page 271

So as to ensure proper operation of the rain
sensor 3, the sensor field must be free from
dust and dirt and the windsc reen wash
system m ust be opera ted a t regular
intervals. Vehic les with rain sensor 3 can b e
identified by the sensor field near the top of
the w indscreen.
Service setting for front windscr een wip er
(e.g. for cha nging or cleaning the front
wiper b la des).
Within 8 seconds of switching off the
ignition, press the windscreen wip er stalk
downwards. Release the windscreen wip er
stalk as soon as the w ip er blad es are
vertical.
Wiper bl ades on the windscreen
Activating serv ice p osition, see preceding
column. Lift wiper arm. Press the release
lever a nd detac h the wiper blade.
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