Jeep 2004 Grand Cherokee Owner's Manual page 83

Since the rain sensor is designed to detect
NOTE:
moisture, road spray, smashed bugs, and moisture from
passing trucks may occasionally cause the wipers to cycle
if the lever is in AUTO. Also, manual intervention may be
necessary under certain conditions: Additional wipes
may be desired, in foggy/misty mornings, where con-
densation builds up very slowly on the windshield, or
when water accumulated on the roof of the vehicle runs
down the windshield, but not over the sensor.
Fewer wipes and/or washer fluid may be desired when
salty road spray is encountered, where the operator may
want to turn the "Auto" feature off and use the "Wash"
and/or "Mist" functions.
UNDERSTANDING THE FEATURES OF YOUR VEHICLE 83
CAUTION!
Turn the wiper lever to the OFF position to avoid
wiper damage when driving through an automatic
car wash.
WARNING!
Turn the wiper lever to the OFF position when
cleaning your windshield to avoid injury.
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