Cadillac 2000 DeVille Owner's Manual page 111

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Rainsense Wipers (If Equipped)
This moisture sensor is mounted on the passenger's
interior side of the windshield behind the rearview
mirror and is used to automatically operate the wipers
by monitoring the amount of moisture that is on
the windshield.
The Rainsense system can be activated by turning the
wiper stalk to one of the five sensitivity levels indicated
on the stalk. The position closest to OFF is the lowest
sensitivity setting. This allows more water to collect on
the windshield between wipes. Turning the stalk away
from you to the other settings increases the sensitivity of
the system and frequency of wipes. A single wipe will
occur each time you turn the wiper stalk to a higher
sensitivity level. An initial wipe occurs when you turn
the ignition on as a reminder that Rainsense is active.
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The Rainsense wipers operate in a delay mode as well as
a continuous low or high speed depending on the
amount of moisture and the sensitivity level. The MIST
and "wash" cycles operate as normal and are not
affected by the Rainsense function.
NOTICE:
The wipers must be turned off when going
through a car wash to avoid damage.
It is important to note that the Rainsense wiping feature
can be overridden at any time by manually changing the
wiper control to LO or HI speed.
If you ever need to replace the windshield, make sure it
is Rainsense compatible.