Buick 2010 Lucerne Owner's Manual page 167

Slow wipes.
Fast wipes.
Turns the wipers off.
Clear ice and snow from the wiper blades before using
them. If frozen to the windshield, carefully loosen or
thaw them. Damaged blades should be replaced.
Heavy snow or ice can overload the wiper motor.
A circuit breaker will stop the motor until it cools.
The vehicle has wiper-activated headlamps. After the
windshield wipers have completed eight wipe cycles
within four minutes, the headlamps automatically turn
on. See Wiper Activated Headlamps on page 4 13 for
more information.
If the vehicle has this feature, the moisture sensor is
mounted on the interior of the windshield beside the
rearview mirror and is used to automatically operate the
wipers. This system operates by monitoring the amount
of moisture build-up on the windshield. Wipes occur as
needed to clear the windshield depending on the driving
conditions and the sensitivity setting. In light rain or
snow, fewer wipes will occur. In heavy rain or snow,
wipes will occur more frequently. The system operates
in the delay mode. If the system is left on for long
periods of time, occasional wipes may occur without
any moisture on the windshield. This is normal and
indicates that the Rainsense system is active.
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